WO2013110673A1 - Diterpene production - Google Patents
Diterpene production Download PDFInfo
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- WO2013110673A1 WO2013110673A1 PCT/EP2013/051262 EP2013051262W WO2013110673A1 WO 2013110673 A1 WO2013110673 A1 WO 2013110673A1 EP 2013051262 W EP2013051262 W EP 2013051262W WO 2013110673 A1 WO2013110673 A1 WO 2013110673A1
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- WIPO (PCT)
- Prior art keywords
- nucleotide sequence
- sequence
- polypeptide
- diterpene
- seq
- Prior art date
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- 150000004141 diterpene derivatives Chemical class 0.000 title claims description 139
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- 239000002773 nucleotide Substances 0.000 claims abstract description 264
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- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical class C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 description 1
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- 125000000969 xylosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)CO1)* 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/116—Heterocyclic compounds
- A23K20/121—Heterocyclic compounds containing oxygen or sulfur as hetero atom
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/163—Sugars; Polysaccharides
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/52—Adding ingredients
- A23L2/60—Sweeteners
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/30—Artificial sweetening agents
- A23L27/33—Artificial sweetening agents containing sugars or derivatives
- A23L27/36—Terpene glycosides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H15/00—Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
- C07H15/20—Carbocyclic rings
- C07H15/24—Condensed ring systems having three or more rings
- C07H15/256—Polyterpene radicals
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0071—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14)
- C12N9/0073—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14) with NADH or NADPH as one donor, and incorporation of one atom of oxygen 1.14.13
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1048—Glycosyltransferases (2.4)
- C12N9/1051—Hexosyltransferases (2.4.1)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/88—Lyases (4.)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/90—Isomerases (5.)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/44—Preparation of O-glycosides, e.g. glucosides
- C12P19/56—Preparation of O-glycosides, e.g. glucosides having an oxygen atom of the saccharide radical directly bound to a condensed ring system having three or more carbocyclic rings, e.g. daunomycin, adriamycin
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/007—Preparation of hydrocarbons or halogenated hydrocarbons containing one or more isoprene units, i.e. terpenes
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y114/00—Oxidoreductases acting on paired donors, with incorporation or reduction of molecular oxygen (1.14)
- C12Y114/13—Oxidoreductases acting on paired donors, with incorporation or reduction of molecular oxygen (1.14) with NADH or NADPH as one donor, and incorporation of one atom of oxygen (1.14.13)
- C12Y114/13078—Ent-kaurene oxidase (1.14.13.78)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y204/00—Glycosyltransferases (2.4)
- C12Y204/01—Hexosyltransferases (2.4.1)
- C12Y204/01035—Phenol beta-glucosyltransferase (2.4.1.35)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y402/00—Carbon-oxygen lyases (4.2)
- C12Y402/03—Carbon-oxygen lyases (4.2) acting on phosphates (4.2.3)
- C12Y402/03019—Ent-kaurene synthase (4.2.3.19)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y505/00—Intramolecular lyases (5.5)
- C12Y505/01—Intramolecular lyases (5.5.1)
- C12Y505/01013—Ent-copalyl diphosphate synthase (5.5.1.13)
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
Definitions
- the present invention relates to a recombinant microorganism capable of producing a diterpene and/or a glycosylated diterpene and to a process for the production of a diterpene and/or a glycosylated diterpene by use of such a cell.
- the invention further relates to a fermentation broth comprising a diterpene and/or glycosylated diterpene obtainable by such a process.
- sweet steviol glycosides have functional and sensory properties that appear to be superior to those of many high potency sweeteners.
- Steviol glycosides accumulate in Stevia leaves where they may comprise from 10 to 20% of the leaf dry weight.
- Stevioside and rebaudioside A are both heat and pH stable and suitable for use in carbonated beverages and many other foods.
- Stevioside is between 1 10 and 270 times sweeter than sucrose, rebaudioside A between 150 and 320 times sweeter than sucrose.
- rebaudioside D is also a high-potency diterpene glycoside sweetener which accumulates in Stevia leaves. It may be about 200 times sweeter than sucrose Currently, steviol glycosides are extracted from the Stevia plant.
- steviol is synthesized from GGPP, which is formed by the deoxyxylulose 5- phosphate pathway.
- the activity of two diterpene cyclases (-)-copalyl diphosphate synthase (CPS) and (-)-kaurene synthase (KS) results in the formation of (- )-Kaurene which is then oxidized in a three step reaction by (-)-kaurene oxidase (KO) to form (-)-kaurenoic acid.
- (-)-kaurenoic acid is then hydroxylated, by ent-kaurenoic acid 13-hydroxylase (KAH) to form steviol.
- KAH ent-kaurenoic acid 13-hydroxylase
- Steviol is then glucosylated by a series of UDP- glucosyltransferases (UGTs).
- This invention relates to a microorganism capable of producing a diterpene, such as steviol, or a glycosylated diterpene (i.e. a diterpene glycoside), such as steviolmonoside, steviolbioside, stevioside, rebaudioside A, rebaudioside B, rebaudioside C, rebaudioside D, rebaudioside E, rebaudioside F, rubusoside or dulcoside A.
- a diterpene such as steviol
- a glycosylated diterpene i.e. a diterpene glycoside
- a recombinant microorganism comprising one or more nucleotide sequence(s) encoding:
- KS ent-Kaurene synthase
- the invention also provides a recombinant microorganism of the invention, wherein the microorganism comprises one or more nucleotide sequence(s) encoding one or more polypeptides having UDP-glucosyltransferase activity (UGT),
- UDP-glucosyltransferase activity UDP-glucosyltransferase activity
- nucleotide sequence confers on the microorganism the ability to produce at least one of steviolmonoside, steviolbioside, stevioside, rebaudioside A, rebaudioside B, rebaudioside C, rebaudioside D, rebaudioside E, rebaudioside F, rubusoside or dulcoside A.
- the invention also provides:
- a process for the preparation of a diterpene or glycosylated diterpene which comprises fermenting a recombinant microorganism of the invention in a suitable fermentation medium, and optionally recovering the diterpene or glycosylated diterpene; a process for the preparation of a diterpene or glycosylated diterpene which process comprises fermenting a recombinant microorganism capable of producing a diterpene or glycosylate diterpene in a suitable fermentation medium at a temperature of about 29°C or less, and optionally recovering the diterpene or glycosylated diterpene; a fermentation broth comprising a diterpene or glycosylated diterpene obtainable by the process of the invention;
- a diterpene or glycosylated diterpene obtained by a process according to the invention or obtainable from a fermentation broth according to the invention;
- diterpene or glycosylated diterpene which is rebaudioside A or rebaudioside D;
- a foodstuff, feed or beverage which comprises a diterpene or glycosylated according to the invention.
- Also provided by the invention is a method for converting a first glycosylated diterpene into a second glycosylated diterpene, which method comprises:
- Figure 1 sets out a schematic representation of the plasmid pUG7-EcoRV.
- Figure 2 sets out a schematic representation of the method by which the ERG20, tHMG1 and BTS1 over-expression cassettes are designed (A) and integrated (B) into the yeast genome.
- C shows the final situation after removal of the KANMX marker by the Cre recombinase.
- FIG. 3 sets out a schematic representation of the ERG9 knock down construct. This consists of a 500 bp long 3' part of ERG9, 98 bp of the TRP1 promoter, the TRP1 open reading frame and terminator, followed by a 400 bp long downstream sequence of ERG9. Due to introduction of a Xbal site at the end of the ERG9 open reading frame the last amino acid changes into Ser and the stop codon into Arg. A new stop codon is located in the TPR1 promoter, resulting in an extension of 18 amino acids.
- Figure 4 sets out a schematic representation of how UGT2 is integrated into the genome.
- Figure 5 sets out a schematic representation of how the pathway from GGPP to Steviol is integrated into the genome.
- Figure 6 sets out a schematic representation of how the pathway from GGPP to RebA is integrated into the genome.
- Figure 7 sets out steviol production in strain STV018. Samples from shake flasks were taken after 7 days, treated with heat and acetonitrile, and Steviol concentrations were determined with LC/MS.
- Figure 8 sets out RebA production in strain STV006. Samples from shake flask were taken after 7 days, treated with heat and acetonitrile, and Steviol concentrations were determined with LC/MS.
- Figure 9 sets out RebA production in strains STV006, STV012, STV016 and STV017. Samples from shake flasks were taken after 7 days, treated with heat and acetonitrile, and RebA concentrations were determined with LC/MS.
- Figure 10 sets out stevioside and RebA production in strains STV018, STV019 and STV020. Samples from shake flasks were taken after 7 days, treated with heat and acetonitrile, and stevioside and RebA concentrations were determined with LC/MS.
- Figure 1 1 sets out a schematic representation of the plasmid MB6754.
- Figure 12 sets out a schematic representation of the plasmid MB6761.
- Figure 13 sets out a schematic representation of the plasmid MB6762.
- Figure 14 sets out a schematic representation of the plasmid MB6775.
- Figure 15 sets out a schematic representation of how the pathway from GGPP to RebD is integrated into the genome.
- Figure 16 sets out RebD and RebA production in strains STV006 and STV015. Samples from shake flasks were taken after 7 days, treated with heat and acetonitrile, and RebD and RebA concentrations were determined with LC/MS.
- Figure 17 sets out a schematic diagram of the potential pathways leading to biosynthesis of steviol glycosides.
- the invention relates to a recombinant microorganism that is capable of producing a diterpene or a glycosylated diterpene, typically steviol or a steviol glycoside respectively.
- a diterpene typically means an organic compound composed of four isoprene units. Such a compound may be derived from geranylgeranyl pyrophosphate.
- a glycosylated diterpene or diterpene glycoside is a diterpene in which a sugar is bound, typically to a non-carbohydrate moiety.
- the sugar group may be bonded through its anomeric carbon to another group via a glycosidic bond.
- a preferred diterpene and diterpene glycoside is steviol and steviol glycoside respectively.
- the invention relates to a recombinant microorganism which is capable of producing steviol or a steviol glycoside.
- the recombinant microorganism comprises one or more nucleotide sequence(s) encoding:
- a polypeptide having enf-copalyl pyrophosphate synthase (EC 5.5.1.13) is capable of catalyzing the chemical reation:
- This enzyme has one substrate, geranylgeranyl pyrophosphate, and one product, enf-copalyl pyrophosphate.
- This enzyme participates in gibberellin biosynthesis.
- This enzyme belongs to the family of isomerase, specifically the class of intramolecular lyases.
- the systematic name of this enzyme class is enf-copalyl-diphosphate lyase (decyclizing).
- Other names in common use include having enf-copalyl pyrophosphate synthase, enf-kaurene synthase A, and enf-kaurene synthetase A.
- a polypeptide having ent-kaurene synthase activity (EC 4.2.3.19) is a polypeptide that is capable of catalyzing the chemical reaction: ent-copalyl diphosphate + diphosphate
- this enzyme has one substrate, ent-copalyl diphosphate, and two products, ent-kaurene and diphosphate.
- This enzyme belongs to the family of lyases, specifically those carbon-oxygen lyases acting on phosphates.
- the systematic name of this enzyme class is ent-copalyl- diphosphate diphosphate-lyase (cyclizing, ent-kaurene-forming).
- Other names in common use include ent-kaurene synthase B, ent-kaurene synthetase B, ent-copalyl- diphosphate diphosphate-lyase, and (cyclizing). This enzyme participates in diterpenoid biosynthesis.
- enf-copalyl diphosphate synthases may also have a distinct enf-kaurene synthase activity associated with the same protein molecule.
- the reaction catalyzed by enf-kaurene synthase is the next step in the biosynthetic pathway to gibberellins.
- the two types of enzymic activity are distinct, and site-directed mutagenesis to suppress the enf-kaurene synthase activity of the protein leads to build up of enf-copalyl
- a single nucleotide sequence used in the invention may encode a polypeptide having enf-copalyl pyrophosphate synthase activity and enf-kaurene synthase activity.
- the two activities may be encoded two distinct, separate nucleotide sequences.
- a polypeptide having ent-kaurene oxidase activity (EC 1.14.13.78) is a polypeptide which is capable of catalysing three successive oxidations of the 4-methyl group of ent-kaurene to give kaurenoic acid.
- Such activity typically requires the presence of a cytochrome P450.
- a polypeptide having kaurenoic acid 13- hydroxylase activity (EC 1.14.13) is one which is capable of catalyzing the formation of steviol (ent-kaur-16-en-13-ol-19-oic acid) using NADPH and 0 2 . Such activity may also be referred to as ent-ka 13-hydroxylase activity.
- a recombinant microorganism of the invention may comprise one or more nucleotide sequences encoding a polypeptide having UDP-glucosyltransferase (UGT) activity, whereby expression of the nucleotide sequence(s) confer(s) on the microorganism the ability to produce at least one of steviolmonoside, steviolbioside, stevioside or rebaudioside A, rebaudioside B, rebaudioside C, rebaudioside D, rebaudioside E, rebaudioside F, rubusoside, dulcoside A.
- UDP-glucosyltransferase UDP-glucosyltransferase
- a polypeptide having UGT activity is one which has glycosyltransferase activity (EC 2.4), i.e. that can act as a catalyst for the transfer of a monosaccharide unit from an activated nucleotide sugar (also known as the "glycosyl donor") to a glycosyl acceptor molecule, usually an alcohol.
- the glycosyl donor for a UGT is typically the nucleotide sugar uridine diphosphate glucose (uracil-diphosphate glucose, UDP-glucose).
- the UGTs used may be selected so as to produce a desired diterpene glycoside, such as a steviol glycoside.
- rebaudioside A The biosynthesis of rebaudioside A involves glucosylation of the aglycone steviol.
- rebaudioside A can be formed by glucosylation of the 13-OH of steviol which forms the 13-O-steviolmonoside, glucosylation of the C-2' of the 13-O-glucose of steviolmonoside which forms steviol-1 ,2-bioside, glucosylation of the C-19 carboxyl of steviol-1 ,2-bioside which forms stevioside, and glucosylation of the C-3' of the C-13-0- glucose of stevioside.
- the order in which each glucosylation reaction occurs can vary - see Figure 17.
- One UGT may be capable of catalyzing more than one conversion as set out in this scheme.
- a microorganism of the invention may comprise any combination of a UGT74G1 , UGT85C2, UGT76G1 and UGT2.
- UGT64G1 sequences are indicated as UGT1 sequences
- UGT74G1 sequences are indicated as UGT3 sequences
- UGT76G1 sequences are indicated as UGT4 sequences.
- UGT2 sequences are indicated as UGT2 sequences in Table 1.
- a recombinant microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-13-glucose to steviol. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which steviol is converted to steviolmonoside. Accordingly, expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least steviolmonoside.
- Such a microorganism of the invention may comprise a nucleotide sequence encoding a polypeptide having the activity shown by UDP-glycosyltransferase (UGT) UGT85C2, whereby the nucleotide sequence upon transformation of the microorganism confers on the cell the ability to convert steviol to steviolmonoside.
- UDP-glycosyltransferase UGT85C2
- UGT85C2 activity is transfer of a glucose unit to the 13-OH of steviol.
- a suitable UGT85C2 may function as a uridine 5'-diphospho glucosyl: steviol 13-OH transferase, and a uridine 5'-diphospho glucosyl: steviol- 19-0- glucoside 13-OH transferase.
- a functional UGT85C2 polypeptides may also catalyze glucosyl transferase reactions that utilize steviol glycoside substrates other than steviol and steviol- 19-0- glucoside. Such sequences are indicated as UGT1 sequences in Table 1.
- a recombinant microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-13-glucose to steviol or steviolmonoside. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which steviolmonoside is converted to steviolbioside. Accordingly, such a microorganism may be capable of converting steviolmonoside to steviolbioside. Expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least steviolbioside.
- a microorganism of the invention may also comprise a nucleotide sequence encoding a polypeptide having the activity shown by UDP-glycosyltransferase (UGT) UGT74G1 , whereby the nucleotide sequence upon transformation of the microorganism confers on the cell the ability to convert steviolmonoside to steviolbioside.
- UDP-glycosyltransferase UGT74G1
- a microorganism of the invention may also comprise a nucleotide sequence encoding a polypeptide having the activity shown by UDP-glycosyltransferase (UGT) UGT2, whereby the nucleotide sequence upon transformation of the microorganism confers on the cell the ability to convert steviolmonoside to steviolbioside.
- UDP-glycosyltransferase UGT2
- a suitable UGT2 polypeptide functions as a uridine 5'-diphospho glucosyl: steviol- 13-O-glucoside transferase (also referred to as a steviol-13- monoglucoside 1 ,2- glucosylase), transferring a glucose moiety to the C-2' of the 13- O-glucose of the acceptor molecule, steviol- 13-O-glucoside.
- a suitable UGT2 polypeptide also functions as a uridine 5'-diphospho glucosyl: rubusoside transferase transferring a glucose moiety to the C-2' of the 13-O-glucose of the acceptor molecule, rubusoside.
- Functional UGT2 polypeptides may also catalyze reactions that utilize steviol glycoside substrates other than steviol- 13-0-glucoside and rubusoside, e.g., functional UGT2 polypeptides may utilize stevioside as a substrate, transferring a glucose moiety to the C-2' of the 19-O-glucose residue to produce Rebaudioside E.
- a functional UGT2 polypeptides may also utilize Rebaudioside A as a substrate, transferring a glucose moiety to the C-2' of the 19-O-glucose residue to produce Rebaudioside D.
- a functional UGT2 polypeptide typically does not transfer a glucose moiety to steviol compounds having a 1 ,3-bound glucose at the C- 13 position, i.e., transfer of a glucose moiety to steviol 1 ,3- bioside and 1 ,3-stevioside does not occur.
- Functional UGT2 polypeptides may also transfer sugar moieties from donors other than uridine diphosphate glucose.
- a functional UGT2 polypeptide may act as a uridine 5'-diphospho D-xylosyl: steviol- 13 -O-glucoside transferase, transferring a xylose moiety to the C-2' of the 13-O-glucose of the acceptor molecule, steviol- 13 -O-glucoside.
- a functional UGT2 polypeptide can act as a uridine 5'-diphospho L- rhamnosyl: steviol- 13-0- glucoside transferase, transferring a rhamnose moiety to the C-2' of the 13-O-glucose of the acceptor molecule, steviol-13-O-glucoside.
- Such sequences are indicated as UGT2 sequences in Table 1.
- a recombinant microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-19-glucose to steviolbioside. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which steviolbioside is converted to stevioside. Accordingly, such a microorganism may be capable of converting steviolbioside to stevioside. Expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least stevioside.
- a microorganism of the invention may also comprise a nucleotide sequence encoding a polypeptide having the activity shown by UDP-glycosyltransferase (UGT) UGT74G1 , whereby the nucleotide sequence upon transformation of the microorganism confers on the cell the ability to convert steviolbioside to stevioside.
- UDP-glycosyltransferase UGT74G1
- Suitable UGT74G1 polypeptides may be capable of transferring a glucose unit to the 13-OH or the 19-COOH, respectively, of steviol.
- a suitable UGT74G1 polypeptide may function as a uridine 5'-diphospho glucosyl: steviol 19-COOH transferase and a uridine 5'- diphospho glucosyl: steviol- 13-O-glucoside 19-COOH transferase.
- Functional UGT74G1 polypeptides also may catalyze glycosyl transferase reactions that utilize steviol glycoside substrates other than steviol and steviol- 13-O-glucoside, or that transfer sugar moieties from donors other than uridine diphosphate glucose.
- a recombinant microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing glucosylation of the C-3' of the glucose at the C-13 position of stevioside. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which stevioside to rebaudioside A. Accordingly, such a microorganism may be capable of converting stevioside to rebaudioside A. Expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least rebaudioside A.
- a microorganism of the invention may also comprise a nucleotide sequence encoding a polypeptide having the activity shown by UDP-glycosyltransferase (UGT) UGT76G1 , whereby the nucleotide sequence upon transformation of the microorganism confers on the cell the ability to convert stevioside to rebaudioside A.
- UDP-glycosyltransferase UGT76G1
- UGT76G1 adds a glucose moiety to the C-3'of the C-13-O-glucose of the acceptor molecule, a steviol 1 ,2 glycoside.
- UGT76G1 functions, for example, as a uridine 5'-diphospho glucosyl: steviol 13-0-1 ,2 glucoside C-3 ' glucosyl transferase and a uridine 5'-diphospho glucosyl: steviol- 19-0-glucose, 13-0-1 ,2 bioside C-3' glucosyl transferase.
- UGT76G1 polypeptides may also catalyze glucosyl transferase reactions that utilize steviol glycoside substrates that contain sugars other than glucose, e.g., steviol rhamnosides and steviol xylosides. Such sequences are indicated as UGT4 sequences in Table 1.
- a microorganism of the invention may comprise nucleotide sequences encoding polypeptides having one or more of the four UGT activities described above.
- a microorganism of the invention may comprise nucleotide sequences encoding polypeptides having all four of the UGT activities described above.
- a given nucleic acid may encode a polypeptide having one or more of the above activities.
- a nucleic acid encode for a polypeptide which has two, three or four of the activities set out above.
- a recombinant microorganism of the invention comprises UGT1 , UGT2 and UGT3 activity. More preferably, such a recombinant microorganism will also comprise UGT4 activity.
- a microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the glucosylation of stevioside or rebaudioside A. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which stevioside or rebaudioside A is converted to rebaudioside D. Accordingly, such a microorganism may be capable of converting stevioside or rebaudioside A to rebaudioside D.
- nucleotide sequence may confer on the microorganism the ability to produce at least rebaudioside D.
- a microorganism expression a combination of UGT85C2, UGT2, UGT74G1 and UGT76G1 polypeptides may be capable of rebaudioside D production.
- a microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the glucosylation of stevioside. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which stevioside is converted to rebaudioside E. Accordingly, such a microorganism may be capable of converting stevioside to rebaudioside E. Expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least rebaudioside E.
- a microorganism of the invention which comprises a nucleotide sequence encoding a polypeptide having UGT activity may comprise a nucleotide sequence encoding a polypeptide capable of catalyzing the glucosylation of rebaudioside E. That is to say, a microorganism of the invention may comprise a UGT which is capable of catalyzing a reaction in which rebaudioside E is converted to rebaudioside D. Accordingly, such a microorganism may be capable of converting stevioside or rebaudioside A to rebaudioside D. Expression of such a nucleotide sequence may confer on the microorganism the ability to produce at least rebaudioside D.
- a recombinant microorganism of the invention may be capable of expressing a nucleotide sequence encoding a polypeptide having NADPH-cytochrome p450 reductase activity. That is to say, a recombinant microorganism of the invention may comprise sequence encoding a polypeptide having NADPH-cytochrome p450 reductase activity.
- a polypeptide having NADPH-Cytochrome P450 reductase activity (EC 1 .6.2.4; also known as NADPH:ferrihemoprotein oxidoreductase, NADPH:hemoprotein oxidoreductase, NADPH:P450 oxidoreductase, P450 reductase, POR, CPR, CYPOR) is typically one which is a membrane-bound enzyme allowing electron transfer to cytochrome P450 in the microsome of the eukaryotic cell from a FAD- and FMN-containing enzyme NADPH:cytochrome P450 reductase (POR; EC 1 .6.2.4).
- a recombinant microorganism according to any one of the preceding claims, which is capable of expressing one or more of:
- nucleotide sequence encoding a polypeptide having NADPH- cytochrome p450 reductase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having NADPH-cytochrome p450 reductase activity, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 54, 56, 58 or 78;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 53, 55, 57 or 77;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code
- a recombinant microorganism of the invention is one which is capable of expressing one or more of:
- nucleotide sequence encoding a polypeptide having ent-copalyl pyrophosphate synthase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having ent- copalyl pyrophosphate synthase activity, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 2, 4, 6, 8, 18, 20, 60 or 62; ii.
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 1 , 3, 5, 7, 17, 19, 59 or 61 , 141 , 142, 151 , 152, 153, 154, 159, 160, 182 or 184; iii. a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code
- nucleotide sequence encoding a polypeptide having ent-Kaurene synthase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having ent- Kaurene synthase activity, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 10, 12, 14, 16, 18, 20, 64 or 66; ii.
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 9, 1 1 , 13, 15, 17, 19, 63, 65, 143, 144, 155, 156, 157, 158, 159, 160, 183 or 184; iii. a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code
- nucleotide sequence encoding a polypeptide having ent-Kaurene oxidase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having ent- Kaurene oxidase activity, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 22, 24, 26, 68 or 86;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 21 , 23, 25, 67, 85, 145, 161 , 162, 163, 180 or 186;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code;
- nucleotide sequence encoding a polypeptide having kaurenoic acid-hydroxylase activity
- said nucleotide sequence comprises: i. a nucleotide sequence encoding a polypeptide having kaurenoic acid 13-hydroxylase activity, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 28, 30, 32, 34, 70, 90, 92, 94, 96 or 98;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 27, 29, 31 , 33, 69, 89, 91 , 93, 95, 97, 146, 164, 165, 166, 167 or 185;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or iv. a nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- nucleotide in a recombinant microorganism of the invention, which is capable of expressing a nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-13-glucose to steviol, said nucleotide may comprise:
- nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-13-glucose to steviol, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 36, 38 or 72;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 35, 37, 71 , 147, 168, 169 or 189;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a glucose at the C-13 position of steviolmonoside (this typically indicates glucosylation of the C-2' of the C-13-glucose/13-0-glucose of steviolmonoside)
- said nucleotide sequence may comprise:
- nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a C-13-glucose to steviol or steviolmonoside, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 88, 100, 102, 104, 106, 108, 1 10 or 1 12;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 87, 99, 101 , 103, 105, 107, 109, 1 1 1 , 181 or 192;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a ucose at the C-19 position of steviolbioside
- said nucleotide sequence may comprise:
- nucleotide sequence encoding a polypeptide capable of catalyzing the addition of a glucose at the C-19 position of steviolbioside, said polypeptide comprising an amino acid sequence that has at least about 20% sequence identity with the amino acid sequence of SEQ ID NOs: 40, 42, 44, 46, 48 or 74;
- nucleotide sequence that has at least about 15% sequence identity with the nucleotide sequence of SEQ ID NOs: 39, 41 , 43, 45, 47, 73, 148, 170, 171 , 172, 173, 174 or 190 ;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- said nucleotide sequence may comprise:
- nucleotide sequence encoding a polypeptide capable of catalyzing glucosylation of the C-3' of the glucose at the C- 13 position of stevioside, said polypeptide comprising an amino acid sequence that has at least about 20%, preferably at least 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the amino acid sequence of SEQ ID NOs: 50, 52 or 76;
- nucleotide sequence that has at least about 15%, preferably at least 20, 25, 30, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99%, sequence identity with the nucleotide sequence of SEQ ID NOs: 49, 51 , 75, 149, 175, 176 or 191 ;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- nucleotide sequence encoding a polypeptide capable of catalysing one or more of: the glucosylation of stevioside or rebaudioside A to rebaudioside D; the glucosylation of stevioside to rebaudioside E; or the glucosylation of rebaudioside E to rebaudioside D
- said nucleotide sequence may comprise:
- nucleotide sequence encoding a polypeptide capable of catalysing one or more of: the glucosylation of stevioside or rebaudioside A to rebaudioside D; the glucosylation of stevioside to rebaudioside E; or the glucosylation of rebaudioside E to rebaudioside D, said polypeptide comprising an amino acid sequence that has at least about 20% sequence identity with the amino acid sequence of SEQ ID NOs: 88, 100, 102, 104, 106, 108, 1 10, 1 12; ii. a nucleotide sequence that has at least about 15% sequence identity with the nucleotide sequence of SEQ ID NOs: 87, 99, 101 , 103, 105, 107, 109, 1 1 1 , 181 or 192;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- a microorganism according to the invention may be one in which the ability of the microorganism to produce geranylgeranyl pyrophosphate (GGPP) is upregulated.
- GGPP geranylgeranyl pyrophosphate
- Upregulated in the context of this invention implies that the microorganism produces more GGPP than an equivalent non-transformed strain.
- a microorganism of the invention may comprise one or more nucleotide sequence(s) encoding hydroxymethylglutaryl-CoA reductase, farnesyl- pyrophosphate synthetase and geranylgeranyl diphosphate synthase, whereby the nucleotide sequence(s) upon transformation of the microorganism confer(s) on the microorganism the ability to produce elevated levels of GGPP.
- a microorganism according to the invention is one which is capable of expressing one or more of:
- nucleotide sequence encoding a polypeptide having hydroxymethylglutaryl-CoA reductase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having hydroxymethylglutaryl-CoA reductase activity, said polypeptide comprising an amino acid sequence that has at least about 20% sequence identity with the amino acid sequence of SEQ ID NO: 80;
- nucleotide sequence that has at least about 15% sequence identity with the nucleotide sequence of SEQ ID NO: 79;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or iv. a nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code,
- nucleotide sequence encoding a polypeptide having farnesyl- pyrophosphate synthetase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having farnesyl-pyrophosphate synthetase activity, said polypeptide comprising an amino acid sequence that has at least about 20% sequence identity with the amino acid sequence of SEQ ID NO: 82;
- nucleotide sequence that has at least about 15% sequence identity with the nucleotide sequence of SEQ ID NOs: 81 ;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or
- nucleotide sequence which differs from the sequence of a nucleic acid molecule of (iii) due to the degeneracy of the genetic code
- nucleotide sequence encoding a polypeptide having geranylgeranyl diphosphate synthase activity, wherein said nucleotide sequence comprises:
- nucleotide sequence encoding a polypeptide having geranylgeranyl diphosphate synthase activity, said polypeptide comprising an amino acid sequence that has at least about 20% sequence identity with the amino acid sequence of SEQ ID NO: 84;
- nucleotide sequence that has at least about 15% sequence identity with the nucleotide sequence of SEQ ID NOs: 83;
- iii a nucleotide sequence the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); or iv. a nucleotide sequence which differs from the sequence of a nucleic acid molecule of (i), (ii) or (iii) due to the degeneracy of the genetic code.
- the invention relates to a recombinant microorganism.
- a microorganism or microbe for the purposes of this invention, is typically an organism that is not visible to the human eye (i.e. microscopic).
- a microorganism may be from bacteria, fungi, archaea or protists.
- a microorganism will be a single-celled or unicellular organism.
- a recombinant microorganism is defined as a microorganism which is genetically modified or transformed/transfected with one or more of the nucleotide sequences as defined herein.
- the presence of the one or more such nucleotide sequences alters the ability of the microorganism to produce a diterpene or diterpene glycoside, in particular steviol or steviol glycoside.
- a microorganism that is not transformed/transfected or genetically modified, is not a recombinant microorganism and does typically not comprise one or more of the nucleotide sequences enabling the cell to produce a diterpene or diterpene glycoside.
- a non-transformed/non-transfected microorganism is typically a microorganism that does not naturally produce a diterpene, although a microorganism which naturally produces a diterpene or diterpene glycoside and which has been modified according to the invention (and which thus has an altered ability to produce a diterpene/diterpene gylcoside) is considered a recombinant microorganism according to the invention.
- Sequence identity is herein defined as a relationship between two or more amino acid (polypeptide or protein) sequences or two or more nucleic acid (polynucleotide) sequences, as determined by comparing the sequences. Usually, sequence identities or similarities are compared over the whole length of the sequences compared. In the art, “identity” also means the degree of sequence relatedness between amino acid or nucleic acid sequences, as the case may be, as determined by the match between strings of such sequences. "Identity” and “similarity” can be readily calculated by various methods, known to those skilled in the art. Preferred methods to determine identity are designed to give the largest match between the sequences tested. Typically then, identities and similarities are calculated over the entire length of the sequences being compared.
- Methods to determine identity and similarity are codified in publicly available computer programs.
- Preferred computer program methods to determine identity and similarity between two sequences include e.g. the BestFit, BLASTP, BLASTN, and FASTA (Altschul, S. F. et al., J. Mol. Biol. 215:403-410 (1990), publicly available from NCBI and other sources (BLAST Manual, Altschul, S., et al., NCBI NLM NIH Bethesda, MD 20894).
- Preferred parameters for amino acid sequences comparison using BLASTP are gap open 10.0, gap extend 0.5, Blosum 62 matrix.
- Preferred parameters for nucleic acid sequences comparison using BLASTP are gap open 10.0, gap extend 0.5, DNA full matrix (DNA identity matrix).
- Nucleotide sequences encoding the enzymes expressed in the cell of the invention may also be defined by their capability to hybridize with the nucleotide sequences of SEQ ID NO.'s 1 , 3, 5, 7, 9, 1 1 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 31 , 33, 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 53, 55, 57, 59, 61 , 63, 65, 67, 69, 71 , 73, 75, 77, 79, 81 or 84 ir any other sequence mentioned herein respectively, under moderate, or preferably under stringent hybridisation conditions.
- Stringent hybridisation conditions are herein defined as conditions that allow a nucleic acid sequence of at least about 25, preferably about 50 nucleotides, 75 or 100 and most preferably of about 200 or more nucleotides, to hybridise at a temperature of about 65°C in a solution comprising about 1 M salt, preferably 6 x SSC or any other solution having a comparable ionic strength, and washing at 65°C in a solution comprising about 0.1 M salt, or less, preferably 0.2 x SSC or any other solution having a comparable ionic strength.
- the hybridisation is performed overnight, i.e. at least for 10 hours and preferably washing is performed for at least one hour with at least two changes of the washing solution.
- These conditions will usually allow the specific hybridisation of sequences having about 90% or more sequence identity.
- Moderate conditions are herein defined as conditions that allow a nucleic acid sequences of at least 50 nucleotides, preferably of about 200 or more nucleotides, to hybridise at a temperature of about 45°C in a solution comprising about 1 M salt, preferably 6 x SSC or any other solution having a comparable ionic strength, and washing at room temperature in a solution comprising about 1 M salt, preferably 6 x SSC or any other solution having a comparable ionic strength.
- the hybridisation is performed overnight, i.e. at least for 10 hours, and preferably washing is performed for at least one hour with at least two changes of the washing solution.
- the person skilled in the art will be able to modify these hybridisation conditions in order to specifically identify sequences varying in identity between 50% and 90%.
- a nucleotide sequence encoding an ent-copalyl pyrophosphate synthase may for instance comprise a sequence as set out in SEQ ID. NO: 1 , 3, 5, 7, 17, 19, 59, 61 , 141 , 142, 151 , 152, 153, 154, 159, 160, 182 or 184.
- a nucleotide sequence encoding an ent-Kaurene synthase may for instance comprise a sequence as set out in SEQ ID. NO: 9, 1 1 , 13, 15, 17, 19, 63, 65, 143, 144, 155, 156, 157, 158, 159, 160, 183 or 184.
- a nucleotide sequence encoding an ent-Kaurene oxidase may for instance comprise a sequence as set out in SEQ ID. NO: 21 , 23, 25, 67, 85, 145, 161 , 162, 163, 180 or 186.
- a preferred KO is the polypeptide encoded by the nucleic acid set out in SEQ ID NO: 85.
- a nucleotide sequence encoding a kaurenoic acid 13-hydroxylase may for instance comprise a sequence as set out in SEQ ID. NO: 27, 29, 31 , 33, 69, 89, 91 , 93, 95, 97, 146, 164, 165, 166, 167 or 185.
- a preferred KAH sequence is the polypeptide encoded by the nucleic acid set out in SEQ ID NO: 33.
- a further preferred recombinant microorganism of the invention may express a combination of the polypeptides encoded by SEQ ID NO: 85 and SEQ ID NO: 33 or a variant of either thereof as herein described.
- a preferred recombinant microorganism of the invention may expression the combination of sequences set out in Table 8 (in combination with any UGT2, but in particular that encoded by SEQ ID NO: 87).
- a nucleotide sequence encoding a UGT may for instance comprise a sequence as set out in SEQ ID. NO: 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 71 , 73, 75, 168, 169, 170, 171 , 172, 173, 174, 175, 176, 147, 148, 149, 87, 181 , 99, 100, 101 , 102, 103, 104, 105, 106, 107, 108, 109, 1 10, 1 1 1 1 , 1 12, 1 13, 1 14, 1 15, 1 16, 1 17, 1 18, 1 19, 120, 121 , 122, 123, 124, 125, 126, 127, 128, 129, 130, 131 , 132, 133, 134, 135, 136, 137, 138, 139, 140, 189, 190, 191 or 192.
- a nucleotide sequence encoding a hydroxymethylglutaryl-CoA reductase may for instance comprise a sequence as set out in SEQ ID. NO: 79.
- a nucleotide sequence encoding a farnesyl-pyrophosphate synthetase may for instance comprise a sequence as set out in SEQ ID. NO: 81 .
- a nucleotide sequence encoding a geranylgeranyl diphosphate synthase may for instance comprise a sequence as set out in SEQ ID. NO:83.
- a nucleotide sequence encoding a NADPH-cytochrome p450 reductase may for instance comprise a sequence as set out in SEQ ID. NO: 53, 55, 57 or 77.
- UGT sequences combinations of at least one from each of: (i) SEQ ID NOs: 35, 37, 168, 169, 71 , 147 or 189; (ii) SEQ ID NOs: 87, 99, 101 , 103, 105, 107, 109, 1 1 1 , 181 or 192; (iii) SEQ ID NOs: 39, 41 , 43, 45, 47, 170, 171 , 172, 173, 174, 73, 148 or 190; and (iv) SEQ ID NOs: 49, 51 , 175, 176, 75, 149 or 191 may be preferred.
- at least one UGT from group (i) may be used.
- At least one UGT from group (iii) is used, generally at least one UGT from group (i) is also used. If at least one UGT from group (iv) is used, generally at least one UGT from group (i) and at least one UGT from group (iii) is used. Typically, at least one UGT form group (ii) is used.
- a sequence which has at least about 10%, about 15%, about 20%, preferably at least about 25%, about 30%, about 40%, about 50%, about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, about 85%, about 90%, about 95%, about 96%, about 97%, about 98%, or about 99% sequence identity with a sequence as mentioned may be used in the invention.
- the corresponding encoding nucleotide sequence may be adapted to optimise its codon usage to that of the chosen eukaryote host cell.
- the adaptiveness of the nucleotide sequences encoding the enzymes to the codon usage of the chosen host cell may be expressed as codon adaptation index (CAI).
- CAI codon adaptation index
- the codon adaptation index is herein defined as a measurement of the relative adaptiveness of the codon usage of a gene towards the codon usage of highly expressed genes.
- the relative adaptiveness (w) of each codon is the ratio of the usage of each codon, to that of the most abundant codon for the same amino acid.
- CAI index is defined as the geometric mean of these relative adaptiveness values. Non- synonymous codons and termination codons (dependent on genetic code) are excluded. CAI values range from 0 to 1 , with higher values indicating a higher proportion of the most abundant codons (see Sharp and Li, 1987, Nucleic Acids Research 15: 1281 -1295; also see: Jansen et al., 2003, Nucleic Acids Res. 31 (8):2242-51 ).
- An adapted nucleotide sequence preferably has a CAI of at least 0.2, 0.3, 0.4, 0.5, 0.6 or 0.7.
- the eukaryotic cell according to the present invention is genetically modified with (a) nucleotide sequence(s) which is (are) adapted to the codon usage of the eukaryotic cell using codon pair optimisation technology as disclosed in PCT/EP2007/05594.
- Codon-pair optimisation is a method for producing a polypeptide in a host cell, wherein the nucleotide sequences encoding the polypeptide have been modified with respect to their codon-usage, in particular the codon-pairs that are used, to obtain improved expression of the nucleotide sequence encoding the polypeptide and/or improved production of the polypeptide.
- Codon pairs are defined as a set of two subsequent triplets (codons) in a coding sequence.
- the microorganism according to the present invention may be any suitable host cell from microbial origin.
- the host cell is a yeast or a filamentous fungus. More preferably, the host cell belongs to one of the genera Saccharomyces, Aspergillus, Penicillium, Pichia, Kluyveromyces, Yarrowia, Candida, Hansenula, Humicola, Torulaspora, Trichosporon, Brettanomyces, Pachysolen or Yamadazyma or Zygosaccharomyces.
- a more preferred microorganism belongs to the species Aspergillus niger, Penicillium chrysogenum, Pichia stipidis, Kluyveromyces marxianus, K. lactis, K. thermotolerans, Yarrowia lipolytica, Candida sonorensis, C. glabrata, Hansenula polymorpha, Torulaspora delbrueckii, Brettanomyces bruxellensis, Zygosaccharomyces bailii, Saccharomyces uvarum, Saccharomyces bayanus or Saccharomyces cerevisiae species.
- the eukaryotic cell is a Saccharomyces cerevisiae.
- a recombinant yeast cell according to the invention may be modified so that the ERG9 gene is down-regulated and or the ERG5/ERG6 genes are deleted.
- Corresponding genes may be modified in this way in other microorganisms.
- Such a microorganism may be transformed as set out herein, whereby the nucleotide sequence(s) with which the microorganism is transformed confer(s) on the cell the ability to produce a diterpene or glycoside thereof.
- a preferred microorganism according to the invention is a yeast such as a Saccharomyces cerevisiae or Yarrowia lipolytica cell.
- a recombinant microorganism of the invention such as a recombinant Saccharomyces cerevisiae cell or Yarrowia lipolytica cell may comprise one or more nucleotide sequence(s) from each of the following groups; (i) SEQ ID. NO: 1 , 3, 5, 7, 17, 19, 59, 61 , 141 , 142, 152, 153, 154, 159, 160, 182 or 184.
- Such a microorganism will typically also comprise one or more nucleotide sequence(s) as set out in SEQ ID. NO: 53, 55, 57 or 77.
- Such a microorganism may also comprise one or more nucleotide sequences as set out in 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 71 , 73, 75, 168, 169, 170, 171 , 172, 173, 174, 175, 176, 147, 148, 149, 87, 181 , 99, 100, 101 , 102, 103, 104, 105, 106, 107, 108, 109, 1 10, 1 1 1 1 , 1 12, 1 13, 1 14, 1 15, 1 16, 1 17, 1 18, 1 19, 120, 121 , 122, 123, 124, 125, 126, 127, 128, 129, 130, 131 , 132, 133, 134, 135, 136, 137, 138, 139, 140, 189, 190, 191 or 192.
- combinations of at least one from each of (i) SEQ ID NOs: 35, 37, 168, 169, 71 , 147 or 189; (ii) SEQ ID NOs: 87, 99, 101 , 103, 105, 107, 109, 1 1 1 , 181 or 192; (iii) SEQ ID NOs: 39, 41 , 43, 45, 47, 170, 171 , 172, 173, 174, 73, 148 or 190; and (iv) SEQ ID NOs: 49, 51 , 175, 176, 75, 149 or 191 may be preferred.
- at least one UGT from group (i) may be used.
- At least one UGT from group (iii) is used, generally at least one UGT from group (i) is also used. If at least one UGT from group (iv) is used, generally at least one UGT from group (i) and at least one UGT from group (iii) is used. Typically, at least one UGT form group (ii) is used.
- Such a microorganism may also comprise the following nucleotide sequences: SEQ ID. NO: 79; SEQ ID. NO: 81 ; and SEQ ID. NO: 83.
- a variant having at least about 15%, preferably at least about 20, about 25, about 30, about 40, about 50, about 55, about 60, about 65, about 70, about 75, about 80, about 85, about 90, about 95, about 96, about 97, about 98, or about 99%, sequence identity with the stated sequence may be used.
- nucleotide sequences encoding the ent-copalyl pyrophosphate synthase, ent-Kaurene synthase, ent-Kaurene oxidase, kaurenoic acid 13-hydroxylase, UGTs, hydroxymethylglutaryl-CoA reductase, farnesyl-pyrophosphate synthetase, geranylgeranyl diphosphate synthase and NADPH-cytochrome p450 reductase may be ligated into one or more nucleic acid constructs to facilitate the transformation of the microorganism according to the present invention.
- a nucleic acid construct may be a plasmid carrying the genes encoding enzymes of the diterpene, eg. steviol/steviol glycoside, pathway as described above, or a nucleic acid construct may comprise two or three plasmids carrying each three or two genes, respectively, encoding the enzymes of the diterpene pathway distributed in any appropriate way.
- Any suitable plasmid may be used, for instance a low copy plasmid or a high copy plasmid.
- the nucleic acid construct may be maintained episomally and thus comprise a sequence for autonomous replication, such as an autosomal replication sequence sequence.
- a suitable episomal nucleic acid construct may e.g. be based on the yeast 2 ⁇ or pKD1 plasmids (Gleer et al., 1991 , Biotechnology 9: 968-975), or the AMA plasmids (Fierro et al., 1995, Curr Genet. 29:482-489).
- each nucleic acid construct may be integrated in one or more copies into the genome of the host cell. Integration into the host cell's genome may occur at random by non-homologous recombination but preferably the nucleic acid construct may be integrated into the host cell's genome by homologous recombination as is well known in the art (see e.g. WO90/14423, EP-A-0481008, EP-A-0635 574 and US 6,265, 186).
- a selectable marker may be present in the nucleic acid construct.
- the term "marker” refers to a gene encoding a trait or a phenotype which permits the selection of, or the screening for, a microorganism containing the marker.
- the marker gene may be an antibiotic resistance gene whereby the appropriate antibiotic can be used to select for transformed cells from among cells that are not transformed.
- non-antibiotic resistance markers are used, such as auxotrophic markers (URA3, TRP1 , LEU2).
- the host cells transformed with the nucleic acid constructs may be marker gene free.
- recombinant marker gene free microbial host cells are disclosed in EP-A-0 635 574 and are based on the use of bidirectional markers.
- a screenable marker such as Green Fluorescent Protein, /acZ, luciferase, chloramphenicol acetyltransferase, beta-glucuronidase may be incorporated into the nucleic acid constructs of the invention allowing to screen for transformed cells.
- a preferred marker-free method for the introduction of heterologous polynucleotides is described in WO0540186.
- operably linked refers to a linkage of polynucleotide elements (or coding sequences or nucleic acid sequence) in a functional relationship.
- a nucleic acid sequence is “operably linked” when it is placed into a functional relationship with another nucleic acid sequence.
- a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the coding sequence.
- promoter refers to a nucleic acid fragment that functions to control the transcription of one or more genes, located upstream with respect to the direction of transcription of the transcription initiation site of the gene, and is structurally identified by the presence of a binding site for DNA-dependent RNA polymerase, transcription initiation sites and any other DNA sequences, including, but not limited to transcription factor binding sites, repressor and activator protein binding sites, and any other sequences of nucleotides known to one of skilled in the art to act directly or indirectly to regulate the amount of transcription from the promoter.
- a “constitutive” promoter is a promoter that is active under most environmental and developmental conditions.
- An “inducible” promoter is a promoter that is active under environmental or developmental regulation.
- the promoter that could be used to achieve the expression of the nucleotide sequences coding for an enzyme as defined herein above may be not native to the nucleotide sequence coding for the enzyme to be expressed, i.e. a promoter that is heterologous to the nucleotide sequence (coding sequence) to which it is operably linked.
- the promoter is homologous, i.e. endogenous to the host cell
- Suitable promoters in microorganisms of the invention may be GAL7, GAL10, or GAL 1 , CYC1 , HIS3, ADH1 , PGL, PH05, GAPDH, ADC1 , TRP1 , URA3, LEU2, ENO, TPI, and AOX1 .
- Other suitable promoters include PDC, GPD1 , PGK1 , TEF1 , and TDH. Further suitable promoters are set out in the Examples.
- any terminator which is functional in the cell, may be used in the present invention.
- Preferred terminators are obtained from natural genes of the host cell. Suitable terminator sequences are well known in the art. Preferably, such terminators are combined with mutations that prevent nonsense mediated mRNA decay in the host cell of the invention (see for example: Shirley et al., 2002, Genetics 161 :1465-1482).
- Nucleotide sequences used in the invention may include sequences which target them to desired compartments of the microorganism. For example, in a preferred microorganism of the invention, all nucleotide sequences, except for ent-Kaurene oxidase, kaurenoic acid 13-hydroxylase and NADPH-cytochrome p450 reductase encoding sequences may be targeted to the cytosol. This approach may be used in a yeast cell.
- nucleic acid or polypeptide molecule when used to indicate the relation between a given (recombinant) nucleic acid or polypeptide molecule and a given host organism or host cell, is understood to mean that in nature the nucleic acid or polypeptide molecule is produced by a host cell or organisms of the same species, preferably of the same variety or strain.
- heterologous when used with respect to a nucleic acid (DNA or RNA) or protein refers to a nucleic acid or protein that does not occur naturally as part of the organism, cell, genome or DNA or RNA sequence in which it is present, or that is found in a cell or location or locations in the genome or DNA or RNA sequence that differ from that in which it is found in nature.
- Heterologous nucleic acids or proteins are not endogenous to the cell into which it is introduced, but have been obtained from another cell or synthetically or recombinantly produced.
- recombinant microorganism of the invention will comprise heterologous nucleotide sequences.
- a recombinant microorganism of the invention may comprise entirely homologous sequence which has been modified as set out herein so that the microorganism produces increased amounts of a diterpene and/or diterpene glycoside in comparison to a non-modified version of the same microorganism.
- One or more enzymes of the diterpene pathway as described herein may be overexpressed to achieve a sufficient diterpene production by the cell.
- an enzyme may be overexpressed by increasing the copy number of the gene coding for the enzyme in the host cell, e.g. by integrating additional copies of the gene in the host cell's genome.
- a preferred host cell according to the present invention may be a recombinant cell which is naturally capable of producing GGPP.
- a recombinant microorganism according to the present invention may be able to grow on any suitable carbon source known in the art and convert it to a diterpene or a diterpene glycoside.
- the recombinant microorganism may be able to convert directly plant biomass, celluloses, hemicelluloses, pectines, rhamnose, galactose, fucose, maltose, maltodextrines, ribose, ribulose, or starch, starch derivatives, sucrose, lactose and glycerol.
- a preferred host organism expresses enzymes such as cellulases (endocellulases and exocellulases) and hemicellulases (e.g. endo- and exo-xylanases, arabinases) necessary for the conversion of cellulose into glucose monomers and hemicellulose into xylose and arabinose monomers, pectinases able to convert pectines into glucuronic acid and galacturonic acid or amylases to convert starch into glucose monomers.
- the host cell is able to convert a carbon source selected from the group consisting of glucose, xylose, arabinose, sucrose, lactose and glycerol.
- the host cell may for instance be a eukaryotic host cell as described in WO03/062430, WO06/009434, EP1499708B1 , WO2006096130 or WO04/099381.
- the present invention relates to a process for the production of a diterpene or diterpene glycoside comprising fermenting a transformed eukaryotic cell according to the present invention in a suitable fermentation medium, and optionally recovering the diterpene and/or diterpene glycoside.
- the fermentation medium used in the process for the production of a diterpene or diterpene glycoside may be any suitable fermentation medium which allows growth of a particular eukaryotic host cell.
- the essential elements of the fermentation medium are known to the person skilled in the art and may be adapted to the host cell selected.
- the fermentation medium comprises a carbon source selected from the group consisting of plant biomass, celluloses, hemicelluloses, pectines, rhamnose, galactose, fucose, fructose, maltose, maltodextrines, ribose, ribulose, or starch, starch derivatives, sucrose, lactose, fatty acids, triglycerides and glycerol.
- the fermentation medium also comprises a nitrogen source such as ureum, or an ammonium salt such as ammonium sulphate, ammonium chloride, ammoniumnitrate or ammonium phosphate.
- the fermentation process according to the present invention may be carried out in batch, fed-batch or continuous mode.
- a separate hydrolysis and fermentation (SHF) process or a simultaneous saccharification and fermentation (SSF) process may also be applied.
- SHF hydrolysis and fermentation
- SSF simultaneous saccharification and fermentation
- a combination of these fermentation process modes may also be possible for optimal productivity.
- a SSF process may be particularly attractive if starch, cellulose, hemicelluose or pectin is used as a carbon source in the fermentation process, where it may be necessary to add hydrolytic enzymes, such as cellulases, hemicellulases or pectinases to hydrolyse the substrate.
- the recombinant microorganism used in the process for the preparation of a diterpene or diterpene glycoside may be any suitable microorganism as defined herein above. It may be advantageous to use a recombinant eukaryotic microorganism according to the invention in the process for the production of a diterpene or diterpene glycoside, because most eukaryotic cells do not require sterile conditions for propagation and are insensitive to bacteriophage infections. In addition, eukaryotic host cells may be grown at low pH to prevent bacterial contamination.
- the recombinant microorganism according to the present invention may be a facultative anaerobic microorganism.
- a facultative anaerobic microorganism can be propagated aerobically to a high cell concentration. This anaerobic phase can then be carried out at high cell density which reduces the fermentation volume required substantially, and may minimize the risk of contamination with aerobic microorganisms.
- the fermentation process for the production of a diterpene according to the present invention may be an aerobic or an anaerobic fermentation process.
- An anaerobic fermentation process may be herein defined as a fermentation process run in the absence of oxygen or in which substantially no oxygen is consumed, preferably less than 5, 2.5 or 1 mmol/L/h, and wherein organic molecules serve as both electron donor and electron acceptors.
- the fermentation process according to the present invention may also first be run under aerobic conditions and subsequently under anaerobic conditions.
- the fermentation process may also be run under oxygen-limited, or micro- aerobical, conditions. Alternatively, the fermentation process may first be run under aerobic conditions and subsequently under oxygen-limited conditions.
- An oxygen-limited fermentation process is a process in which the oxygen consumption is limited by the oxygen transfer from the gas to the liquid. The degree of oxygen limitation is determined by the amount and composition of the ingoing gasflow as well as the actual mixing/mass transfer properties of the fermentation equipment used.
- the production of a diterpene in the process according to the present invention may occur during the growth phase of the host cell, during the stationary (steady state) phase or during both phases. It may be possible to run the fermentation process at different temperatures.
- the process for the production of a diterpene or diterpene glycoside may be run at a temperature which is optimal for the eukaryotic cell.
- the optimum growth temperature may differ for each transformed eukaryotic cell and is known to the person skilled in the art.
- the optimum temperature might be higher than optimal for wild type organisms to grow the organism efficiently under non-sterile conditions under minimal infection sensitivity and lowest cooling cost.
- the process may be carried out at a temperature which is not optimal for growth of the recombinant microorganism. Indeed, we have shown that a process for the preparation of a diterpene or diterpene glycoside may be carried out beneficially at a sub-optimal growth temperature of a recombinant microorganism.
- the temperature for growth of the recombinant microorganism in a process for production of a diterpene or diterpene glycoside may be above 20°C, 22°C, 25°C, 28°C, or above 30°C, 35°C, or above 37°C, 40°C, 42°C, and preferably below 45°C.
- the optimum temperature might be lower than average in order to optimize biomass stability.
- the temperature during this phase may be below 45°C, for instance below 42°C, 40°C, 37°C, for instance below 35°C, 30°C, or below 28°C, 25°C, 22°C or below 20°C preferably above 15°C.
- the invention thus provides a process for the preparation of a diterpene or glycosylated diterpene which process comprises fermenting a recombinant microorganism capable of producing a diterpene or glycosylate diterpene in a suitable fermentation medium at a temperature of about 29°C or less, and optionally recovering the diterpene or glycosylated diterpene.
- the microorganism may be a microorganism according to the invention.
- the temperature of fermentation in such a process may be about 29°C or less, about 28°C or less, about 27°C or less, about 26°C or less or at a lower temperature.
- the process for the production of a diterpene or diterpene glycoside according to the present invention may be carried out at any suitable pH value.
- the recombinant microorganism is yeast
- the pH in the fermentation medium preferably has a value of below 6, preferably below 5,5, preferably below 5, preferably below 4,5, preferably below 4, preferably below pH 3,5 or below pH 3,0, or below pH 2,5, preferably above pH 2.
- Such a process may be carried out on an industrial scale.
- the product of such a process may be one or more of steviolmonoside, steviolbioside, stevioside or rebaudioside A, rebaudioside B, rebaudioside C, rebaudioside D, rebaudioside E, rebaudioside F, rubusoside, dulcoside A.
- rebaudioside A or rebaudioside D is produced.
- Recovery of the diterpene or diterpene glycoside from the fermentation medium may be performed by known methods in the art, for instance by distillation, vacuum extraction, solvent extraction, or evaporation.
- a concentration of above 5 mg/l fermentation broth preferably above 10 mg/l, preferably above 20 mg/l, preferably above 30 mg/l fermentation broth, preferably above 40 mg/l, more preferably above 50 mg/l, preferably above 60 mg/l, preferably above 70, preferably above 80 mg/l, preferably above 100 mg/l, preferably above 1 g/l, preferably above 5 g/l, preferably above 10 g/l, but usually below 70 g/l.
- the present invention also relates to a fermentation broth comprising a diterpene and/or diterpene glycoside obtainable by the process according to the present invention.
- the diterpene or glycosylated diterpene may be a steviol glycoside, in particular rebaudioside A or rebaudioside D.
- the invention also relates to a method for converting a first glycosylated diterpene into a second glycosylated diterpene, which method comprises:
- the second glycosylated diterpene may be rebaudioside A or rebuadioside D.
- the method may be carried out in a format such that the first glycosylated diterpene is rebaudioside A and the second glycosylated diterpene is rebaudioside D.
- the diterpene or diterpene glycoside for example rebaudioside A or rebuadioside D, produced by the fermentation process according to the present invention may be used in any application known for such compounds.
- they may for instance be used as a sweetener, for example in a food or a beverage.
- steviol glycosides may be formulated in soft drinks, as a tabletop sweetener, chewing gum, dairy product such as yoghurt (eg. plain yoghurt), cake, cereal or cereal- based food, nutraceutical, pharmaceutical, edible gel, confectionery product, cosmetic, toothpastes or other oral cavity composition, etc.
- a diterpene or diterpene glycoside can be used as a sweetener not only for drinks, foodstuffs, and other products dedicated for human consumption, but also in animal feed and fodder with improved characteristics.
- the invention provides, inter alia, a foodstuff, feed or beverage which comprises a diterpene or glycosylated prepared according to a process of the invention.
- the diterpene or diterpene glycoside obtained in this invention can be used in dry or liquid forms. It can be added before or after heat treatment of food products. The amount of the sweetener depends on the purpose of usage. It can be added alone or in the combination with other compounds.
- Non-calorific or calorific sweeteners may be blended with one or more further non-calorific or calorific sweeteners. Such blending may be used to improve flavour or temporal profile or stability.
- a wide range of both non-calorific and calorific sweeteners may be suitable for blending with steviol glycosides.
- non-calorific sweeteners such as mogroside, monatin, aspartame, acesulfame salts, cyclamate, sucralose, saccharin salts or erythritol.
- Calorific sweeteners suitable for blending with steviol glycosides include sugar alcohols and carbohydrates such as sucrose, glucose, fructose and HFCS. Sweet tasting amino acids such as glycine, alanine or serine may also be used.
- the diterpene or diterpene glycoside can be used in the combination with a sweetener suppressor, such as a natural sweetener suppressor. It may be combined with an umami taste enhancer, such as an amino acid or a salt thereof.
- a diterpene or diterpene glycoside can be combined with a polyol or sugar alcohol, a carbohydrate, a physiologically active substance or functional ingredient (for example a carotenoid, dietary fiber, fatty acid, saponin, antioxidant, nutraceutical, flavonoid, isothiocyanate, phenol, plant sterol or stanol (phytosterols and phytostanols), a polyols, a prebiotic, a probiotic, a phytoestrogen, soy protein, sulfides/thiols, amino acids, a protein, a vitamin, a mineral, and/or a substance classified based on a health benefits, such as cardiovascular, cholesterol-reducing or anti-inflammatory.
- a physiologically active substance or functional ingredient for example a carotenoid, dietary fiber, fatty acid, saponin, antioxidant, nutraceutical, flavonoid, isothiocyanate, phenol, plant sterol or stanol (phytoste
- a composition with a diterpene or diterpene glycoside may include a flavoring agent, an aroma component, a nucleotide, an organic acid, an organic acid salt, an inorganic acid, a bitter compound, a protein or protein hydrolyzate, a surfactant, a flavonoid, an astringent compound, a vitamin, a dietary fiber, an antioxidant, a fatty acid and/or a salt.
- a diterpene or diterpene glycoside of the invention may be applied as a high intensity sweetener to produce zero calorie, reduced calorie or diabetic beverages and food products with improved taste characteristics. Also it can be used in drinks, foodstuffs, pharmaceuticals, and other products in which sugar cannot be used.
- a diterpene or diterpene glycoside of the invention may be used as a sweetener not only for drinks, foodstuffs, and other products dedicated for human consumption, but also in animal feed and fodder with improved characteristics.
- the examples of products where a diterpene or diterpene glycoside of the invention composition can be used as a sweetening compound can be as alcoholic beverages such as vodka, wine, beer, liquor, sake, etc; natural juices, refreshing drinks, carbonated soft drinks, diet drinks, zero calorie drinks, reduced calorie drinks and foods, yogurt drinks, instant juices, instant coffee, powdered types of instant beverages, canned products, syrups, fermented soybean paste, soy sauce, vinegar, dressings, mayonnaise, ketchups, curry, soup, instant bouillon, powdered soy sauce, powdered vinegar, types of biscuits, rice biscuit, crackers, bread, chocolates, caramel, candy, chewing gum, jelly, pudding, preserved fruits and vegetables, fresh cream, jam, marmalade, flower paste, powdered milk, ice cream, sorbet, vegetables and fruits packed in bottles, canned and boiled beans, meat and foods boiled in sweetened sauce, agricultural vegetable food products, seafood, ham, sausage, fish ham, fish sausage, fish paste,
- the sweetened composition comprises a beverage, non-limiting examples of which include non-carbonated and carbonated beverages such as colas, ginger ales, root beers, ciders, fruit-flavored soft drinks (e.g., citrus-flavored soft drinks such as lemon-lime or orange), powdered soft drinks, and the like; fruit juices originating in fruits or vegetables, fruit juices including squeezed juices or the like, fruit juices containing fruit particles, fruit beverages, fruit juice beverages, beverages containing fruit juices, beverages with fruit flavorings, vegetable juices, juices containing vegetables, and mixed juices containing fruits and vegetables; sport drinks, energy drinks, near water and the like drinks (e.g., water with natural or synthetic flavorants); tea type or favorite type beverages such as coffee, cocoa, black tea, green tea, oolong tea and the like; beverages containing milk components such as milk beverages, coffee containing milk components, cafe au lait, milk tea, fruit milk beverages, drinkable yogurt, lactic acid bacteria beverages or the like; and dairy products.
- the amount of sweetener present in a sweetened composition varies widely depending on the particular type of sweetened composition and its desired sweetness. Those of ordinary skill in the art can readily discern the appropriate amount of sweetener to put in the sweetened composition.
- the diterpene or diterpene glycoside of the invention obtained in this invention can be used in dry or liquid forms. It can be added before or after heat treatment of food products. The amount of the sweetener depends on the purpose of usage. It can be added alone or in the combination with other compounds.
- compositions of the present invention can be made by any method known to those skilled in the art that provide homogenous even or homogeneous mixtures of the ingredients. These methods include dry blending, spray drying, agglomeration, wet granulation, compaction, co-crystallization and the like.
- a diterpene or diterpene glycoside of the invention of the present invention can be provided to consumers in any form suitable for delivery into the comestible to be sweetened, including sachets, packets, bulk bags or boxes, cubes, tablets, mists, or dissolvable strips.
- the composition can be delivered as a unit dose or in bulk form.
- the composition may include various bulking agents, functional ingredients, colorants, flavors.
- Standard genetic techniques such as overexpression of enzymes in the host cells, as well as for additional genetic modification of host cells, are known methods in the art, such as described in Sambrook and Russel (2001 ) "Molecular Cloning: A Laboratory Manual (3 rd edition), Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, or F. Ausubel et al, eds., "Current protocols in molecular biology", Green Publishing and Wiley Interscience, New York (1987). Methods for transformation and genetic modification of fungal host cells are known from e.g. EP-A-0 635 574, WO 98/46772, WO 99/60102 and WO 00/37671.
- SEQ ID NO 79, 81 and 83 are obtained by the codon-pair method as disclosed in PCT/EP2007/05594 for S. cerevisiae and synthesized at DNA 2.0. Sequence ID nos 79, 81 and 83 are cloned behind constitutive promoters, after the coding sequence a terminator is placed.
- the expression construct pRS414rebA-01 containing the 3 expression cassettes is created by ligating restriction fragments consisting of synthetic gene constructs into the S. cerevisiae expression vector pRS414 (Sirkoski R.S. and Hieter P, Genetics, 1989, 122(1 ):19-27), based on the multiple cloning site present in this vector. The ligation mix is used for transformation of E. coli DH10B (Invitrogen) resulting in the yeast expression construct pGBS414rebA-01 .
- sequences of SEQ ID NOs 1 , 3, 5, 7, 9, 1 1 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 31 , 33, 53, 55, 57, 59, 61 , 63, 65, 67, 69 and 77 are obtained by the codon-pair method as disclosed in PCT/EP2007/05594 for S. cerevisiae and synthesized at DNA 2.0.
- Sequence ID no 1 , 3, 5, 7, 9, 1 1 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 31 , 33, 53, 55, 57, 59, 61 , 63, 65, 67, 69 and 77 are cloned behind constitutive promoters, after the coding sequence a terminator is placed.
- the expression construct library pRS415rebA- 01 containing various combinations of expression cassettes containing sequence ID no 1 , 3, 5, 7, 9, 1 1 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 31 , 33, 53, 55, 57, 59, 61 , 63, 65, 67, 69 and 77 is created by ligating restriction fragments consisting of synthetic gene constructs into the S. cerevisiae expression vector pRS415 (Sirkoski R.S. and Hieter P, Genetics, 1989, 122(1 ): 19-27), based on the multiple cloning site present in this vector.
- the ligation mix is used for transformation of E.
- sequences of SEQ ID NO 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 71 , 73, or 75 are obtained by the codon-pair method as disclosed in PCT/EP2007/05594 for S. cerevisiae and synthesized at DNA 2.0. Sequence ID no 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 71 , 73, or 75 are cloned behind constitutive promoters, after the coding sequence a terminator is placed.
- the expression construct library pRS416rebA-01 containing various combinations of expression cassettes containing seq ID no 35, 37, 39, 41 , 43, 45, 47, 49, 51 , 71 , 73, or 75 is created by ligating restriction fragments consisting of synthetic gene constructs into the S. cerevisiae expression vector pRS416 (Sirkoski R.S. and Hieter P, Genetics, 1989, 122(1 ):19-27), based on the multiple cloning site present in this vector.
- the ligation mix is used for transformation of E. coli DH10B (Invitrogen) resulting in the yeast expression construct library pGBS416rebA-01 .
- the expression plasmid pGBS414rebA-01 and the expression plasmid libraries pGBS415rebA-01 and pGBS416rebA-01 are transformed into S. cerevisiae strain CEN.PK1 13-6B ⁇ MATA ura 3 52 leu 2 112 trp1-289). Transformation mixtures are plated on Yeast Nitrogen Base (YNB) w/o AA (Difco) + 2% glucose.
- YNB Yeast Nitrogen Base
- Transformants are inoculated in Verduyn medium comprising glucose, galactose or other C-sources like ethanol or glycerol, supplemented with appropriate amino acids if required (Verduyn et al., 1992, Yeast. Jul;8(7):501-17) and grown under aerobic, anaerobic and oxygen-limited conditions in shake flasks.
- the medium for anaerobic cultivation is supplemented with 0.01 g/l ergosterol and 0.42 g/l Tween 80 dissolved in ethanol (Andreasen and Stier, 1953, J. cell. Physiol, 41 , 23-36; Andreasen and Stier, 1954, J. Cell. Physiol, 43: 271-281 ). All yeast cultures are grown at 30°C in a shaking incubator at 250-280 rpm.
- a Waters acquity UPLC BEH amide column (1 .7 urn, 2.1 * 150 mm) is used with isocratic elution.
- the mobile phase consists of acetonitrile/10 mM NH4Ac in MilliQ water (pH 6.8), (8:2 v/v), at a flowrate of 300 ul/min.
- the injection volume was 5 ⁇ _, and the column temperature is kept at 30 degrees Celcius.
- ERG20 BTS1 tHMG1
- expression cassettes were designed to be integrated in one locus using technology described in co-pending patent application no. US61/616254.
- suitable primers and genomic DNA from a CEN.PK yeast strain (van Dijken et al. Enzyme and Microbial Technology 26 (2000) 706-714) was used.
- the different genes were ordered as cassettes (containing homologous sequence, promoter, gene, terminator, homologous sequence) at DNA2.0.
- the genes in these cassettes were flanked by constitutive promoters and terminators. See Table 2.
- Plasmid DNA from DNA2.0 containing the ERG20, tHMG1 and BTS1 cassettes were dissolved to a concentration of 100 ng/ ⁇ .
- 20 ng template was used together with 20 pmol of the primers.
- the material was dissolved to a concentration of 0.5 ⁇ g/ ⁇ l.
- Table 2 Composition of the over-expression constructs.
- an Erg9 knock down construct was designed and used that contains a modified 3' end, that continues into the TRP1 promoter driving TRP1 expression.
- the construct containing the Erg9-KD fragment was transformed to E. coli TOP10 cells. Transformants were grown in 2PY(2 times Phytone peptone Yeast extract), sAMP medium. Plasmid DNA was isolated with the QIAprep Spin Miniprep kit (Qiagen) and digested with Sall-HF (New England Biolabs). To concentrate, the DNA was precipitated with ethanol. The fragment was transformed to S. cerevisiae, and colonies were plated on mineral medium (Verduyn et al, 1992. Yeast 8:501-517) agar plates without tryptophan. Correct integration of the Erg9-KD construct was confirmed with diagnostic PCR and sequencing. The schematic of performed transformation of the Erg9-KD construct is illustrated in Figure 3. The strain was named STV003. Example 4. Over-expression of UGT2 1a
- UGT2_1 a For over-expression of UGT2_1 a, technology was used as described in copending patent application nos. US61/616254 and EP12159094.7.
- the UGT2a was ordered as a cassette (containing homologous sequence, promoter, gene, terminator, homologous sequence) at DNA2.0. For details, see Table 4.
- To obtain the fragments containing the marker and Cre-recombinase technology was used as described in copending patent application no. EP12159094.7.
- the NAT marker, conferring resistance to nourseothricin was used for selection.
- Suitable primers were used for amplification. To amplify the 5' and 3' integration flanks for the integration locus, suitable primers and genomic DNA from a CEN.PK yeast strain was used.
- S. cerevisiae yeast strain STV003 was transformed with the fragments listed in Table 5, and the transformation mix was plated on YEPhD agar plates containing 50 ⁇ g/ml nourseothricin (Lexy NTC from Jena Bioscience).
- Example 6 Over-expression of production pathway to RebA: CPS, KS, KO, KAH, CPR. UGT1. UGT3 and UGT4. All pathway genes leading to the production of RebA were designed to be integrated in one locus using technology described in co-pending patent application no. US61/616254. To amplify the 5' and 3' integration flanks for the integration locus, suitable primers and genomic DNA from a CEN.PK yeast strain was used. The different genes were ordered as cassettes (containing homologous sequence, promoter, gene, terminator, homologous sequence) at DNA2.0 (see Table 8 for overview). The DNA from DNA2.0 was dissolved to 100 ng/ ⁇ .
- This stock solution was further diluted to 5 ng/ ⁇ , of which 1 ⁇ was used in a ⁇ -PCR mixture.
- the reaction contained 25 pmol of each primer.
- DNA was purified with the NucleoSpin 96 PCR Clean-up kit (Macherey-Nagel) or alternatively concentrated using ethanol precipitation.
- Table 10 sets out the strains used in Examples 2 to 8.
- Table 1 Strains with different combinations of the KO and CPR enzymes.
- Example 10 Over-expression of partial production pathway: CPS, KS, KO, KAH, CPR, UGT1 and UGT2
- Example 6 Using a similar strategy as detailed in Example 6, we constructed a strain expressing CPS, KS, KO, KAH, CPR, UGT1 and UGT2. The same genes are expressed as described for strain STV006 in example 6, except this strain, named STV019, does not contain a UGT3 and UGT4.
- Example 11 Over-expression of partial production pathway: CPS, KS, KO, KAH,
- Example 6 Using a similar strategy as detailed in Example 6, we constructed a strain expressing CPS, KS, KO, KAH, CPR, UGT1 , UGT2 and UGT4. The genes are expressed as described for strain STV006 in Example 6, except this strain, named STV020, does not contain a UGT4.
- Plasmids pMB6754, pMB6761 , and pMB6762 (see Table 13 and Figures 1 1 , 12 and 13) encoding genes for the synthesis of steviol were constructed as follows. Open reading frames for tCPS (SEQ ID NO: 182), tKS (SEQ ID NO: 183), CPSKS (SEQ ID NO: 184), KOGib (SEQ ID NO: 186), KAH4 (SEQ ID NO: 185), CPR1 (SEQ ID NO: 187) and CPR3 (SEQ ID NO: 188) were codon pair optimized using codon pair optimisation technology as disclosed in PCT/EP2007/05594, for expression in Yarrowia lipolytica.
- Vector DNA SEQID 198, consisting of the S. cerevisiae centromere-based URA3 plasmid YCp50 (Rose et al., Gene 1987; 60(2-3):237-43) with ENOp from Yarrowia replacing the tet gene using standard techniques, was prepared from E.
- Yarrowia strain ML2597 with increased expression of geranylgeranyldiphosphate synthase was obtained by transformation of MF350 with pMB4591 ⁇ tef1-GGS URA2) (US7851 199).
- Plasmids pMB6754, pMB6761 , and pMB6762 were digested with Sfi ⁇ and used to transform ML2597 to leucine prototrophy on minimal glucose aspartate medium containing adenine (0.2 mM). Transformants were restreaked to selective medium and subsequently inoculated to 0.8 ml YPD in 24 well microtiter plates (MTP). Plates were sealed with a BugStopper mat (Whatman) and strains were grown for steviol production at 30°C with shaking at 800 rpm for six days in a Multitron incubator (Infors).
- 500 ⁇ culture broth was transferred to a microfuge tube and 250 ⁇ acetonitrile and 600 ⁇ silica beads (0.5 mm) were added. Cells were disrupted by bead beating for 10 min, and cell debris was pelleted at 13,000xg for 1 min in a microcentrifuge.
- Example 15 production of RebA in recombinant Yarrowia lipolytica
- Plasmid pMB6775 (see Table 13 and Figure 14) encoding genes for the synthesis of RebA was constructed as follows. Open reading frames for a UGT1 , UGT3, UGT4, and UGT2 were codon pair optimized using codon pair optimisation technology as disclosed in PCT/EP2007/05594, for expression in Yarrowia lipolytica. The optimized sequences, flanked by 60 bp of the desired promoter and terminator, were synthesized by GenScript (SEQ ID NOs 189-192), and amplified by PCR using appropriate primers.
- DNA fragments encoding terminator-promoter sequences or Yarrowia lipolytica markers were amplified by PCR from existing constructs (SEQ ID NOS: 194-196, 199 and 200).
- the vector (SEQ ID NO: 198), consisting of the S. cerevisiae centromere-based URA3 plasmid YCp50 (Rose et al., supra) with ENOp from Yarrowia replacing the tet gene using standard techniques, was prepared from E. coli and digested with Xba ⁇ and SnaBI. All fragments were purified by gel electrophoresis using a QiaQuick kit (Qiagen). S.
- Plasmid MB6775 was digested with Sfi ⁇ and used to transform Steviol producing Yarrowia strains ML12925, ML12929, and ML12931 to hygromycin resistance (100 mg/L) on YPD agar plates. Transformants were restreaked to selective medium and subsequently inoculated to 0.8 ml YPD in 24 well microtiter plates (MTP). Plates were sealed with a BugStopper mat (Whatman) and strains are grown for steviol production at 30°C with shaking at 800 rpm for six days in a Multitron incubator (Infors).
- MTP microtiter plates
- Variation in the expression level of the genes of a metabolic pathway may result in variation in product and by-product formation. Changing the expression levels of genes who's gene products compete for the same substrate may alter the amount and nature of the products produced.
- One approach to change the expression level of a gene is by changing the strength of the promoter driving the expression of that gene. Different conditions may also alter the expression of genes. We made use of different promoters to alter the expression of the UGTs described in Example 6.
- Example 17 RebD production in strain STV015 S. cerevisiae yeast strain containing the modifications described in examples 1 ,2,3,4, 6, and 16, strain STV015, was grown in YEP (Yeast Extract Peptone) with glucose. Shake flasks were incubated at 30 degrees C, and incubated 7 days. To extract product from the cells, whole broth was incubated at 95°C for 15 minutes, acetonitrile was added (halve volume equivalent), samples were mixed and spun down. Samples were diluted with 33% acetonitrile when appropriate. Samples were analyzed for RebA and RebD using LC/MS. RebA (RV0141-94, DAE Pyung Co. Ltd) and RebD (ASB- 00018229-010, ChromaDex) were used as standards. Results are illustrated in Figure 16.
- Saccharomyces cerevisiae strain STV006 (see Example 6 above) was cultivated on suitable media enabling active transcription and translation of the introduced genes. Obtained cells were pelleted and stored at -20 until analysis.
- the total reaction volume was 100uL and the assay were performed in microtiterplates (MTP) heated to 30 degrees C in a MTP eppendorf incubator.
- MTP microtiterplates
- Incubations were done while shaking at 800 rpm up to 12 hrs.
- the MTP's were sealed to prevent contamination and evaporation.
- Reaction mixtures were centrifuged at 4 degrees C for 20 minutes to stop the enzyme reaction and collect the samples. 50uL of acetonitrile was added to 10OuL of sample in order to completely stop the reaction and extract all molecules formed. To this end the MTP's were sealed and shaken vigorously. Subsequently, the samples were centrifuged for 60 minutes at 4 degrees C and 10Oul was transferred to a new MTP for LC-MS analysis.
- Example 19 Diterpenes or glycosylated diterpenes production by Saccharomyces cerevisiae 19.1 Construction of recombinant host for diterpenes or glycosylated diterpenes production
- an UHPLC system was coupled to a triple quadrupole mass spectrometer and rebaudiosisde A was detected in MS/MS mode by the loss of a hexose unit from the protonated molecule.
- the mobile phase consists of acetonitrile/10 mM NH4Ac in MilliQ water (pH 6.8), (8:2 v/v), at a flowrate of 300 ul/min.
- the injection volume was 5 ⁇ , and the column temperature is kept at 30 degrees Celcius.
- the medium was based on Verduyn et al. (Verduyn C, Postma E, Scheffers WA, Van Dijken JP. Yeast, 1992 Jul;8(7):501 -517), with modifications in the carbon and nitrogen sources, as described in Table 26.
- Zincsulphate . 7H 2 0 ZnS0 4 .7H 2 0 4.50
- Ironsulphate . 7H 2 0 FeS0 4 .7H 2 0 3.00
- the pH was controlled at 5.0 by addition of ammonia (12.5 wt%). Temperature was controlled at 27°C, 30°C or 33°C. p0 2 was controlled at 40% by adjusting the stirrer speed. Glucose concentration was kept limited by controlled feed to the fermenter.
- Saccharomyces cerevisiae at 27°C results in higher production of RebA as compared with fermentation at the normal temperature of 30°C.
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Priority Applications (14)
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CN201380006372.9A CN104203005A (en) | 2012-01-23 | 2013-01-23 | production of diterpenes |
BR112014018066A BR112014018066A8 (en) | 2012-01-23 | 2013-01-23 | diterpenes production |
AU2013211605A AU2013211605B2 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
US14/373,571 US20150031868A1 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
KR1020147020506A KR102170340B1 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
EA201400836A EA201400836A8 (en) | 2012-01-23 | 2013-01-23 | OBTAINING Diterpen |
CA2862980A CA2862980A1 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
EP18198435.2A EP3444338A1 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
DK13700929.6T DK2806754T3 (en) | 2012-01-23 | 2013-01-23 | Diterpene PREPARATION |
EP13700929.6A EP2806754B1 (en) | 2012-01-23 | 2013-01-23 | Diterpene production |
MX2014008898A MX355028B (en) | 2012-01-23 | 2013-01-23 | Diterpene production. |
HK15105281.0A HK1204529A1 (en) | 2012-01-23 | 2015-06-03 | Diterpene production |
AU2017202390A AU2017202390A1 (en) | 2012-01-23 | 2017-04-11 | Diterpene production |
AU2019204690A AU2019204690A1 (en) | 2012-01-23 | 2019-07-01 | Diterpene production |
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