JP6543758B2 - プトレシンまたはオルニチンの生産微生物及びそれを用いたプトレシンまたはオルニチンの生産方法 - Google Patents
プトレシンまたはオルニチンの生産微生物及びそれを用いたプトレシンまたはオルニチンの生産方法 Download PDFInfo
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- JP6543758B2 JP6543758B2 JP2018502763A JP2018502763A JP6543758B2 JP 6543758 B2 JP6543758 B2 JP 6543758B2 JP 2018502763 A JP2018502763 A JP 2018502763A JP 2018502763 A JP2018502763 A JP 2018502763A JP 6543758 B2 JP6543758 B2 JP 6543758B2
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- ornithine
- putrescine
- corynebacterium
- microorganism
- lyscp1
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Description
本発明の他の目的は、前記微生物を用いてプトレシンまたはオルニチンを生産する方法を提供することにある。
(i)前記プトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物を培地で培養する段階;及び
(ii)前記培養された微生物または培地からプトレシンまたはオルニチンを回収する段階を含む、プトレシンまたはオルニチンの生産方法を提供する。
本発明の一つの具体例は、前記コリネバクテリウム属微生物が、コリネバクテリウム・グルタミカムである、プトレシンまたはオルニチンの生産方法を提供する。
1)前記酵素を暗号化するポリヌクレオチドのコピー数増加、
2)前記ポリヌクレオチドの発現が増加するように発現調節配列の変形、
3)前記酵素の活性が強化されるように染色体上のポリヌクレオチド配列の変形、または
4)その組み合わせによって強化されるように変形する方法などにより行ってもよいが、これに限定されない。
1)前記タンパク質をコードするポリヌクレオチドの一部または全体の欠失、
2)前記ポリヌクレオチドの発現が減少するように発現調節配列の変形、
3)前記タンパク質の活性が弱化されるように染色体上の前記ポリヌクレオチド配列の変形、及び
4)これらの組み合わせから選択された方法によって達成することができ、これに限定されない。
(i)前記プトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物を培地で培養する段階;及び
(ii)前記培養された微生物または培地からプトレシンまたはオルニチンを回収する段階を含む、プトレシンまたはオルニチンの生産方法を提供する。
以下、本発明を実施例を通じてより詳細に説明する。しかし、これらの実施例は、本発明を例示的に説明するためのもので、本発明の範囲がこれらの実施例に限定されるものではない。
1‐1.ATCC13032基盤のプトレシン生産菌株のトランスポゾン遺伝子内への大腸菌由来のargA及び大腸菌由来のargEを同時に導入した菌株の製作
コリネバクテリウム・グルタミカムATCC13032基盤のプトレシン生産菌株に大腸菌由来のargA及び大腸菌由来のargEの遺伝子を挿入して、プトレシン生産能が向上するかどうかを確認するために、argAとargEを前記菌株のトランスポゾン遺伝子内に導入した。
コリネバクテリウム・グルタミカムATCC13869基盤のプトレシン生産菌株であるDAB12‐aΔNCgl1469(特許文献8)をDAB12‐bと命名し、大腸菌由来のargAと大腸菌由来のargE遺伝子挿入がプトレシン生産能の向上に関与するかどうかを確認するために、argAとargEをトランスポゾン遺伝子内に導入した。
プトレシン生産菌株に大腸菌由来のargA及び大腸菌由来のargEの導入がプトレシン生産に及ぼす効果を確認するために、前記実施例1‐1及び1‐2で製作したコリネバクテリウム・グルタミカム変異株を対象にプトレシン生産能を比較した。
2‐1.ATCC13032基盤のプトレシン生産菌株におけるpta‐ackA プロモーター置換菌株の製作
前記実施例1で製作した大腸菌由来のargA及び大腸菌由来のargEの遺伝子が導入されたプトレシン生産菌株に、さらにホスホトランスアセチラーゼ(phosphotransacetylase)及び酢酸キナーゼ(acetate kinase)(pta‐ackA)活性を強化して、そのプトレシン生産能に及ぼす影響を確認した。
前記実施例2‐1に開示された方法を用いて、コリネバクテリウム・グルタミカムATCC13869由来のpta‐ackAをコードする遺伝子及びそこから発現されるタンパク質配列を確認するために、コリネバクテリウム・グルタミカムATCC13869のゲノムDNAを鋳型にし、配列番号17及び22のプライマー対を用いてPCRを行った(表3及び4)。この際、PCR反応は、95℃で30秒の変性、55℃で30秒のアニーリング及び72℃で3分の伸長過程を30回繰り返した。
大腸菌由来のargAと大腸菌由来のargEが導入されたプトレシン生産菌株におけるpta‐ackAの強化が及ぼす効果を確認するために、前記実施例2‐1及び2‐2で製作したコリネバクテリウム・グルタミカム変異株を対象にプトレシン生産能を比較した。
3‐1.ATCC13032基盤のプトレシン生産菌株のトランスポゾン遺伝子内への大腸菌由来のacs導入菌株の製作
大腸菌由来のargA及び大腸菌由来のargEが導入されたATCC13032基盤のプトレシン生産菌株で大腸菌由来のアセチルCoA合成酵素(acetyl‐CoA synthetase、acs)遺伝子を導入してプトレシン生産能が向上するかどうかを確認するために、lysCP1プロモーターを用いて、acsをトランスポゾン遺伝子内に導入した。
前記実施例3‐1のように、前記製作したpDZTn‐lysCP1‐acsを前記実施例3‐1と同様にDAB12‐b及び実施例1‐2で製作したコリネバクテリウム・グルタミカム変異株DAB12‐b Tn:lysCP1‐argA Tn:lysCP1‐argEにそれぞれ形質転換し、トランスポゾン内にacsが導入されたことを確認した。
大腸菌由来のargAと大腸菌由来のargEが導入されたプトレシン生産菌株におけるacsの導入が及ぼす効果を確認するために、前記実施例3‐1及び3‐2で製作したコリネバクテリウム・グルタミカム変異株を対象にプトレシン生産能を比較した。
4‐1.プトレシン排出能が増加した菌株における大腸菌由来のargA、argEの導入及びpta‐ackAプロモーター置換菌株の製作
プトレシン排出能が増加したKCCM11401P(特許文献9)菌株を基盤に大腸菌由来のargA及び大腸菌由来のargEの導入とコリネpta‐ackA の活性強化により、プトレシン生産能が向上するかどうかを確認するために、菌株を製作した。
プトレシン排出能が増加したコリネバクテリウム・グルタミカム生産菌株に大腸菌由来のargAと大腸菌由来のargEの導入及びpta‐ackAの活性強化が及ぼす効果を確認するために、前記実施例4‐1で製作したコリネバクテリウム・グルタミカム変異株を対象にプトレシン生産能を比較した。
5‐1.KCCM11137P基盤のオルニチン生産菌株のトランスポゾン遺伝子内への大腸菌由来のargA及び大腸菌由来のargEが同時に導入した菌株の製作
コリネバクテリウム・グルタミカムATCC13032基盤のオルニチン生産菌株であるKCCM11137P(特許文献3)に大腸菌由来のargAと大腸菌由来のargEの遺伝子を挿入して、オルニチン生産能が向上するかどうかを確認するために、前記実施例1‐1で製作したベクターを用いて、argAとargEをトランスポゾン遺伝子内に導入した。
オルニチン生産菌株におけるargAとargEを導入するとき、オルニチン生産に及ぼす効果を確認するために、前記実施例5‐1で製作したコリネバクテリウム・グルタミカム変異株を対象にオルニチン生産能を比較した。
6‐1.ATCC13032基盤のオルニチン生産菌株におけるpta‐ackAプロモーター置換菌株の製作
大腸菌由来のargA及び大腸菌由来のargEが導入されたATCC13032基盤のオルニチン生産菌株において、pta‐ackAの活性強化によるオルニチン生産能が向上するかどうかを確認するために、染色体内のpta‐ackAオペロンの開始コドンの前にlysCP1プロモーター(特許文献4)を導入した。
大腸菌由来のargAと大腸菌由来のargEが導入されたオルニチン生産菌株におけるpta‐ackAの強化が及ぼす効果を確認するために、前記実施例6‐1で製作したコリネバクテリウム・グルタミカム変異株を対象にオルニチン生産能を比較した。
7‐1.ATCC11137P基盤のオルニチン生産菌株のトランスポゾン遺伝子内への大腸菌由来のacs導入菌株の製作
大腸菌由来のargA及び大腸菌由来のargEが導入されたATCC13032基盤のオルニチン生産菌株であるKCCM11137P(特許文献3)において、大腸菌由来のacs遺伝子導入によるオルニチン生産能が向上するかどうかを確認するために、lysCP1プロモーターを用いて、acsをトランスポゾン遺伝子内に導入した。
大腸菌由来のargAと大腸菌由来のargEが導入されたオルニチン生産菌株におけるacsの導入が及ぼす効果を確認するために、前記実施例7‐1で製作したコリネバクテリウム・グルタミカム変異株を対象にオルニチン生産能を比較した。
Claims (17)
- プトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物であって、オルニチンアセチルトランスフェラーゼ(ArgJ)の活性を有する前記コリネバクテリウム属微生物に、大腸菌由来のN‐アセチルグルタミン酸シンターゼ(N-acetylglutamate synthase)及び大腸菌由来のアセチルオルニチンデアセチラーゼ(Acetylornithine deacetylase)の活性が導入された、微生物。
- 前記大腸菌由来のN‐アセチルグルタミン酸シンターゼが、配列番号1のアミノ酸配列で構成される、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記大腸菌由来のアセチルオルニチンデアセチラーゼが、配列番号3のアミノ酸配列で構成される、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、コリネバクテリウム・グルタミカム(Corynebacterium glutamicum )である、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにホスホトランスアセチラーゼ(phosphotransacetylase)及び酢酸キナーゼ(acetate kinase)オペロン(pta‐ackA operon)の活性が内在的活性に比べて強化された、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記ホスホトランスアセチラーゼ及び酢酸キナーゼオペロンが、配列番号5または配列番号7のアミノ酸配列で構成される、請求項5に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらに大腸菌由来のアセチルCoA合成酵素(acetyl‐CoA synthetase, acs)の活性が導入されたものである、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記アセチルCoA合成酵素が、配列番号9のアミノ酸配列で構成される、請求項7に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにオルニチンデカルボキシラーゼ(ornithine decarboxylase, ODC)の活性が導入されたものである、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにi)オルニチンカルバモイルトランスフェラーゼ(ArgF)、ii)グルタミン酸エクスポーターまたはiii)オルニチンカルバモイルトランスフェラーゼ及びグルタミン酸エクスポーターの活性が内在的活性に比べて弱化された、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにアセチルγグルタミルリン酸レダクターゼ(ArgC)、アセチルグルタミン酸シンターゼまたはオルニチンアセチルトランスフェラーゼ(ArgJ)、アセチルグルタミン酸キナーゼ(ArgB)、及びアセチルオルニチンアミノトランスフェラーゼ(ArgD)で構成される群から選択される1種以上の活性が内在的活性に比べて強化された、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにアセチルトランスフェラーゼの活性が内在的活性より弱化された、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記アセチルトランスフェラーゼが、配列番号30または31のアミノ酸配列で構成されるタンパク質である、請求項12に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記コリネバクテリウム属微生物が、さらにプトレシンエクスポーターの活性が内在的活性より強化された、請求項1に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- 前記プトレシンエクスポーターが、配列番号26または配列番号28のアミノ酸配列で構成されるタンパク質である、請求項14に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物。
- (i)請求項1〜15のいずれか一項に記載のプトレシンまたはオルニチン生産能を有するコリネバクテリウム属微生物を培地で培養する段階;
及び
(ii)前記培養された微生物または培地からプトレシンまたはオルニチンを回収する段階を含む、プトレシンまたはオルニチンの生産方法。 - 前記コリネバクテリウム属微生物が、コリネバクテリウム・グルタミカムである、請求項16に記載のプトレシンまたはオルニチンの生産方法。
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