JP5395893B2 - 低下したイソクエン酸デヒドロゲナーゼ活性を有する微生物を使用するファインケミカルの製造方法 - Google Patents
低下したイソクエン酸デヒドロゲナーゼ活性を有する微生物を使用するファインケミカルの製造方法 Download PDFInfo
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Description
(1)対応する初期微生物と比較して部分的または完全に低下したイソクエン酸デヒドロゲナーゼ(ICD)活性を有する微生物を使用する、ファインケミカルの製造方法、
(2)対応する初期微生物と比較して部分的または完全に低下したイソクエン酸デヒドロゲナーゼ(ICD)活性を有する組換え微生物。ただし、ICD発現の低下は、該微生物の天然icd配列の代わりの改変ICDコード化ヌクレオチド配列(icd配列)の発現によるものではなく、該宿主細胞のコドン使用頻度に従った場合に、より低い使用頻度のコドンにより、未改変ヌクレオチド配列のコドンの少なくとも1つが、該改変icd配列において置換されるよう、該改変icdコード化配列は未改変icd配列から誘導されている、
(3)ファインケミカルを製造するための、実施形態(2)の微生物の使用、
(4)実施形態(1)の方法により製造されたファインケミカルからの、化学物質、および重合体のような化学物質最終製品の製造方法であって、実施形態(1)の方法による該ファインケミカルの製造を1つの工程として含む製造方法。
以下の略語、用語および定義が本明細書において用いられる。
・酸性アミノ酸(アスパラギン酸およびグルタミン酸);
・塩基性アミノ酸(リシン、アルギニン、ヒスチジン);
・疎水性アミノ酸(ロイシン、イソロイシン、メチオニン、バリン、アラニン);
・親水性アミノ酸(セリン、グリシン、アラニン、トレオニン);
・脂肪族側鎖を有するアミノ酸(グリシン、アラニン、バリン、ロイシン、イソロイシン);
・脂肪族ヒドロキシル側鎖を有するアミノ酸(セリン、トレオニン);
・アミド含有側鎖を有するアミノ酸(アスパラギン、グルタミン);
・芳香族側鎖を有するアミノ酸(フェニルアラニン、チロシン、トリプトファン);
・塩基性側鎖を有するアミノ酸(リシン、アルギニン、ヒスチジン);
・硫黄含有側鎖を有するアミノ酸(システイン、メチオニン)。
(i)1つ若しくは2つのカルボキシル基の除去;
(ii)1つのアミノ基の除去;
(iii)1つのアミノ基の転位;および/または
(iv)脱水素。
本発明は、低下したICD活性を有する微生物による、ファインケミカルへのアミノ酸およびそれらの前駆体の生化学的変換に関する。
1,5-ジアミノペンタン:ポリアミド単量体、ポリウレタン単量体、ピペリジン前駆体;
ベータ-リシン:カプロラクタム前駆体、ポリアミド単量体;
ジピコリン酸:ポリエステル単量体、ポリアミド単量体、安定剤。
(i)グリオキシル酸分路および/または
(ii)ペントースリン酸経路(PPP)
を通る炭素流量が増加する。好ましくは、グリオキシル酸分路を通る炭素流量が増加する。該増加はいずれも、ICD活性低下の結果、該微生物の遺伝的操作の結果、該微生物の天然形質、またはこれらの要因のいずれかの組合せでありうる。グリオキシル酸分路を通る炭素流量の増加は、好ましくは、ICD活性低下および/または該微生物の遺伝的操作の結果である。PPPを通る炭素流量の増加は、好ましくは、該微生物の遺伝的操作の結果、より好ましくは、例えば、Psod(WO 2005/059144)のような強力プロモーターを使用することによる、PPP酵素発現レベルの活性アップレギュレーションの結果である。
R1 = COOH, R2 = NH2, R3 = H; R1 = H, R2 = NH2, R3 = H; R1 = COOH, R2 = H, R3 = NH2]。
(i)アスパラギン酸ファミリーのアミノ酸、特にリシン、
(ii)アスパラギン酸の下流の生化学的経路におけるそれらの生化学的前駆体、および
(iii)該アミノ酸または生化学的前駆体の天然または非天然誘導体
よりなる群から選択される化合物を製造するのに特に適している。非天然誘導体、特に非天然酵素的誘導体、およびアミノ酸の製造が好ましい。これらのうち、リシンの非天然誘導体、またはその前駆体(すなわち、アスパラギン酸からリシンへの生物変換における中間体)の1つの非天然誘導体の製造が好ましい。
(i)1つ若しくは2つのカルボキシル基の除去;
(ii)1つのアミノ基の除去;
(iii)1つのアミノ基の転位;および/または
(iv)脱水素。
ジピコリナート:異種ジピコリン酸シンターゼを有する微生物;
1,5-ジアミノペンタン:異種リシンデカルボキシラーゼを有する微生物;
β-リシン:異種リシン2,3-アミノムターゼを有する微生物。
a)配列番号17(EP 08151031.5の配列番号1)のspoVF遺伝子配列、あるいは
b)EP 08151031.5の配列番号4の実質的に残基193〜残基1691のコード配列を含む合成spoVF遺伝子配列、あるいは
c)ジピコリン酸シンテターゼまたは前記のそのアルファおよび/もしくはベータサブユニットをコードするいずれかのヌクレオチド配列
を含む核酸配列によりコードされうる。
(i)1,5-ジアミノペンタンが中間産物であるポリアミド、ポリウレタンまたはピペリジン、
(ii)β-リシンが中間産物であるカプロラクタムまたはポリアミド、あるいは
(iii)ジピコリナートが中間産物であるポリエステルまたはポリアミドまたは安定剤の製造方法であって、実施形態(1)に関して前記で記載されている方法により該中間産物を製造する工程を含む製造方法である。
本明細書中で用いる「ベクター」なる語は、それに連結された別の核酸を運搬しうる核酸分子を意味する。
1つの実施形態においては、該方法は、ファインケミカルの製造のために適当な培地内で該微生物を培養することを含む。もう1つの実施形態においては、該方法は更に、該ファインケミカルを該培地または該宿主細胞から単離することを含む。
アミノ酸およびそれらの中間体の定量は、当業者に公知のいずれかの典型的方法により行われうる。以下においては、該定量はメチオニンの定量により例示される。定量の更なる例示は実施例の節に記載されている。本発明の文脈においては後者が好ましい。
以下においては、上昇したファインケミカル産生効率を有するC. glutamicumの株が、特定の組換え法を用いてどのようにして構築されうるかを記載する。本明細書中で用いる「キャンベル・イン(Campbell in)」は、環状二本鎖DNA分子の第1 DNA配列に相同である染色体の第1 DNA配列内への該環状DNA分子の線状化体の挿入を有効に引き起こす単一相同組換え事象(クロスイン(cross-in)事象)により該環状二本鎖DNA分子全体(例えば、pClik int sacBに基づくプラスミド)が染色体内に組込まれる元の宿主細胞の形質転換を意味する。「キャンベルド・イン(Campbelled in)」は、「キャンベル・イン(Campbell in)」形質転換体の染色体内に組込まれた線状化DNA配列を意味する。「キャンベル・イン(Campbell in)」は第1相同DNA配列の重複を含有し、その各コピーは該相同組換え交差点のコピーを含み包囲する。該名称は、この種の組換えを最初に提示したアラン・キャンベル(Alan Campbell)教授に由来する。
以下の実施例においては、種々の刊行物(例えば、Sambrookら (2001), Molecular Cloning: A Laboratory Manual, 3rd edition, Cold Spring Harbor Laboratory Press、またはAusubelら (2007), Current Protocols in Molecular Biology, Current Protocols in Protein Science, 2002年版, Wiley Interscience)に記載されている組換えDNA技術および分子生物学の標準的な技術を用いた。特に示されていない限り、全ての細胞、試薬、装置およびキットは、それらの製造業者の説明に従い使用した。
1.1 低下したICD活性を有するCorynebacterium glutamicum株の構築
イソクエン酸デヒドロゲナーゼ(GenbankアクセッションコードX71489)の活性を低下させるために、コドン使用頻度における変化を施した。元の開始コドンATGをGTGにより置換した。該操作はCorynebacterium glutamicumのicd遺伝子の染色体コピー上でのみ行った。ICD活性の後続の測定は該効果の読取りを直接的に可能にする。
・カナマイシン耐性遺伝子、
・陽性選択マーカーとして使用されうるSacB-遺伝子(なぜなら、この遺伝子を含有する細胞はスクロース含有培地上では増殖できないからである)、
・大腸菌(E. coli.)のための複製起点、
・マルチクローニング部位(MCS)。
鋳型としてATCC 13032のゲノムDNAを使用するPCRにより、該インサートを増幅した。以下のオリゴヌクレオチドを使用する融合PCRにより、該コード領域の改変を達成した。表は、使用したプライマーおよび鋳型DNAを示す。
ついでプラスミドpClik int sacB ICD ATG - GTGを使用して、icd遺伝子の天然コード領域を、改変開始コドンを有するコード領域により置換した。使用した株はLU11424であった。
・エレクトロポレーションによる該株内への該プラスミドの導入。該工程は、例えばDE 10046870(株内へのプラスミドの導入がそれに開示されている場合、それを参照により本明細書に組み入れることとする)に記載されている。
・該ゲノム内への第1相同組換え事象の後に該プラスミドを成功裏に組込んだクローンの選択。この選択はカナマイシン含有寒天プレート上の増殖により達成される。その選択工程に加えて、コロニーPCRにより、組換えの成功が確認されうる。該ゲノム内の該プラスミドの存在を確認するために使用したプライマーを以下に示す:BK1776 (AACGGCAGGTATATGTGATG) (PCT/EP2007/061151の配列番号12)およびOLD 450 (CGAGTAGGTCGCGAGCAG) (PCT/EP2007/061151の配列番号13)。該陽性クローンは約600bpのバンドを与える。
・カナマイシン非含有培地内で陽性クローンをインキュベートすることにより、第2組換え事象を生じさせる。
・第2組換え事象によりベクターバックボーンが成功裏に除去されたクローンをスクロース含有培地上の増殖により特定する。SacB遺伝子を含むベクターバックボーンを喪失したクローンのみが生存するであろう。
・ついで、それらの2つの組換え事象が天然idhコード領域の成功裏の置換を引き起こしたクローンを、関連領域にわたるPCR産物の配列決定、およびICD活性の測定により特定した。該PCR産物は、鋳型としての個々のクローンのゲノムDNAならびにプライマーOLD 441およびOLD 442を使用して得た。該PCR産物を精製し、Old 471(GAATCCAACCCACGTTCAGGC)(PCT/EP2007/061151の配列番号14)で配列決定した。
・フィードバック抵抗性酵素を与える突然変異lysC遺伝子(アスパルトキナーゼをコードする)。この目的のために、生じるタンパク質が311位にトレオニンの代わりにイソロイシンを含有するよう、該lysC遺伝子内にヌクレオチド置換を導入した。そのような株の詳細な構築はWO 2005/059093に記載されている。該lysC遺伝子のアクセッション番号はP26512である。
・破壊されたpepCK遺伝子(ホスホエノールカルボキシキナーゼをコードする)。pepCKのアクセッション番号はAB115091である。
・重複ddh遺伝子(ジアミノピメリン酸デヒドロゲナーゼをコードする)。ddhのアクセッション番号はY00151である。
・Psod発現単位により制御される増強されたdapB遺伝子(ジヒドロピコリン酸レダクターゼをコードする)。dapBのアクセッション番号はX67737である。
・重複argSlysAオペロン(アルギニル-tRNAシンテターゼおよびジアミノピメリン酸デカルボキシラーゼをコードする)。argS lysAオペロンのアクセッション番号はX54740である。
・PsoD発現単位により制御される増強されたlysC遺伝子。
・アミノ酸59位にバリンの代わりにアラニンを含有するタンパク質を与える突然変異体hom遺伝子(ホモセリンデヒドロゲナーゼをコードする)。homのアクセッション番号はY00546である。
・アミノ酸458位にプロリンの代わりにセリンを含有するタンパク質を与える点突然変異を含有し発現単位PsoDにより制御される増強され突然変異したpycA遺伝子(ピルビン酸カルボキシラーゼをコードする)。pycAのアクセッション番号はAF038548である。
・アミノ酸243位にアラニンの代わりにトレオニンを含有するタンパク質を与える突然変異zwf遺伝子(グルコース-6-リン酸デヒドロゲナーゼをコードする)。zwfのアクセッション番号はBA000036.3, nt. 1667860-1669404である。
icd遺伝子の操作の効果を、一連の2つの独立した試験において確認した。これらの一連の試験の第1試験においては、ICD活性およびリシン産生を測定した。第2試験は更に、トレハロース産生の測定を含んでいた。
ICD活性に対する効果
初期株LU11424と比較した場合の株ICD ATG-GTGのICD酵素活性の測定により、icd遺伝子の操作の成功を確認した。イソクエン酸デヒドロゲナーゼの活性の測定のために、一晩培養物から無細胞抽出物を調製した。寒天プレートからの単細胞が接種された37g/L BHI(Bacto(商標) Brain Heart Infusion)を含有する複合培地内で細胞を増殖させた。細胞を遠心分離(13.000×g, 5分, Centrifuge 5415 R, Eppendorf, Hamburg, Germany)により回収し、反応バッファー(100 mM Tris-HCl, pH 7.8)で洗浄し、細胞をリボライザー(ribolyser)(Schwingmuhle, Retsch, Haan, Germany)内のガラスビーズで破壊した。細胞残渣を遠心分離(13.000×g, 15分, Centrifuge 5415 R, Eppendorf, Hamburg, Germany)により除去し、無細胞抽出物を使用してタンパク質含量および酵素活性を決定した。Bio-Rad(Quick Start(商標) Bradford Due Reagent, Bio-Rad Laboratories, Hercules, CA, United States)からのブラッドフォード(Bradford)試薬を使用するブラッドフォードの方法により、タンパク質濃度を測定した。340nmの吸光度の増加を追跡することにより、酵素活性を決定した。該反応は、100mM Tris/HCl、10mM MgCl2、0.5mM NADP、1mM イソクエン酸および50μlの該粗細胞抽出物を含有するpH 7.8の1mlの合計容量中で行った。それぞれ、イソクエン酸を伴わない又は細胞抽出物を伴わない陰性対照を実施した。該酵素の比活性はmU/mg タンパク質(1U = 1μmol/分(30℃))として表される。
リシン産生に対する低下したICD活性の効果を分析するために、作製された株を親株と比較した。
再び、初期株LU11424と比較した場合の株ICD ATG→GTGのICD酵素活性の測定、およびリシン産生の測定により、icd遺伝子の操作の成功を確認した。また、トレハロースの産生を測定した。
グルコース、リシンおよび他の産物の濃度を1:10希釈培養上清において決定した。生化学的分析装置(YSI 2700 Select, Kreienbaum, Langenfeld, Germany)を使用してグルコースを定量した。Aminex HPX-87Hカラム(300×7.8; Bio-Rad, Hercules, California)上、オートサンプラーL-2200、ポンプL-2130、UV検出器L-2400、RI検出器L-24900およびカラムオーブンL-2350(Hitachi, VWR, Darmstadt, Germany)よりなるLaChrome HPLCシステム(45℃;移動相として10 mM H2SO4を使用;0.5 ml/分の流速;屈折率(糖)または210nmのUV吸光度(有機酸)による検出)により、有機酸およびトレハロースの濃度を決定した。アミノ酸の定量のためのプロトコールは、o-フタルアルデヒド(OPA)でのプレカラム誘導体化、および記載されているとおり(Kromer, J. O.ら, Anal Biochem 340:171-3 (2005))のC18カラム(Gemini5u, Phenomenex, Aschaffenburg, Germany)上の分離を含んでいた。測定時間を短縮するために、勾配プロファイルを変化させ、溶離液Bを4% 分-1で加えた。660nmでの光度計(Libra S11, Biochrome, Cambridge, UK)において、または細胞乾燥質量(CDM)としての重量分析(CP225D, Sartorius, Goettingen, Germany)により、細胞濃度を決定した。後者の場合、15mLの培養ブロスからの細胞を遠心分離(10分, 9800×g, Biofuge stratos, Heraeus, Hanau, Germany)により回収し、水で3回洗浄し、ついで80℃で3日間乾燥させた。OD660(Libra S11, Biochrome, Cambridge, UK)とCDMとの間の相関係数は1 OD = 0.258 (g CDM) L-1.と決定された。
50mlの本培養容量(500mlバッフル付き振とうフラスコ)で前記のとおりに細胞を増殖させた。細胞を指数関数的増殖相において遠心分離(5分, 9800×g, 4℃, Biofuge stratos, Heraeus, Hanau, Germany)により回収し、破壊バッファー(100mM TrisHCl, pH 7.8)で洗浄し、ついで10mlの同じバッファーに再懸濁させた。ガラスビーズを含有する2mlエッペンドルフチューブ内で750μlの量で細胞懸濁液をアリコート化した。リボライザー(ribolyzer)(MM301, Retsch, Haan, Germany)において30Hz(2×5分; 5分間隔)で破壊を行った。粗細胞抽出物を13000×gで10分間の遠心分離(Centrifuge 5415R, Eppendorf, Hamburg, Germany)により得、酵素活性およびタンパク質含量の決定のために使用した。後者は、BioRadからの試薬溶液(Quick Start Bradford Dye, BioRad, Hercules, USA)を使用するブラッドフォード(Bradford)(Anal Biochem 72:248-54 (1976))の方法により定量した。
ICDのin vitro活性の分析はChenら(Chen, R.およびH. Yang, Arch Biochem Biophys 383:238-45 (2000))のプロトコールに基づくものであった。該反応は、1.5ml ポリスチレンキュベット内で1mlの容量中、pH 7.8および30℃で行った。該アッセイ混合物は100 mM Tris/HCl (pH 7.8)、10 mM MgCl2、1 mM イソシトラート、0.5 mM NADPおよび25μlの粗細胞抽出物を含有していた。NADPH生成による340nmにおける吸光度の変化をオンラインでモニターした(Specord 40, Analytik Jena, Jena, Germany)。それぞれ、イソシトラートを伴うことなく又は細胞抽出物を伴うことなく、陰性対照を行った。炭素源としてのグルコースを含有する最少培地内で増殖させたC. glutamicum LU11424およびICD ATG→GTGの粗細胞抽出物におけるICDの比活性を下記の表に示す。1 U = 1μmol/分(30℃); NADPHのモル吸光係数 = 6.22 L mmol-1 cm-1。
グルコースを用いたときのリシン産生C. glutamicum LU11424およびICD ATG→GTGの産生特性を下記の表に示す。表に示す収率は生物量収率(YX/S)、リシン収率(YLys/S)およびトレハロース収率(YTre/S)(すべて、消費グルコース(S)当たり)であり、3つの並行培養実験からの平均値および対応偏差を表す。該収率は、産物生成および基質消費をプロットした場合の直線ベストフィットの傾きとして決定された。
PCT/EP2007/061151に記載されているもう1つの実験においては、開始コドンにおいて前記ATG-GTG突然変異を含有するイソクエン酸デヒドロゲナーゼ(実施例1.1と比較されたい)を前記のとおりにpClik内にクローニングしてpClik int sacB ICD(ATG-GTG)(PCT/EP2007/061151の配列番号15、本配列表の配列番号5は該ベクターインサートを示す)を得た。ついで、プラスミドpClik int sacB ICD (ATG-GTG)(PCT/EP2007/061151の配列番号15)を株OM469のゲノム内にキャンベル・インおよびキャンベル・アウトすることにより、株M2620を構築した。株OM469はWO 2007/012078に記載されている。
改変されたICD発現レベルを有する株の構築
宿主株と比較して改変されたICD発現レベルを有するジアミノペンタン産生株の構築のために、プラスミドpClik int sacB ICD ATG→GTG(実施例1.1を参照されたい;同義語:pClik int sacB ICD (ATG-GTG)、pClik int sacB ICD ATG-GTG、ベクターインサート;配列番号5を参照されたい)を使用する。使用した親株は、アスパルトキナーゼ遺伝子(NCgl 0247)内への点突然変異T311Iの取り込み、ならびにそれに続く、強力プロモーターPsodの付加による遺伝子量の増幅、ジアミノピメリン酸デヒドロゲナーゼ遺伝子(NCgl 2528)の重複、ホスホエノールピルビン酸カルボキシキナーゼ遺伝子(NGgl 2765)の破壊、および大腸菌(E. coli.)リシンデカルボキシラーゼ遺伝子(Kyoto Encyclopedia of Genes and Genomes, Entry JW0181)の染色体組込みにより、C. glutamicum野生型株ATCC 13032から誘導された1,5-ジアミノペンタン(1,5-DAP)産生体である。ATCC 13032への該改変のそれぞれは、組換えDNA技術の一般的に公知の方法を適用することにより行う。1,5-DAP産生体親株を確立するために使用したプラスミドの配列を配列番号21〜24に示す。配列番号21はpepCK遺伝子(デルタpepCK)の欠失のために使用されうる。配列番号22はddh遺伝子の重複(2×ddh)のために使用されうる。配列番号23は、ask遺伝子の上流のPsodプロモーターの組込み(Psodk ask)によるask遺伝子量の増幅のために使用されうる。配列番号24は、C. glutamicumリシン産生体のbioD領域内の大腸菌(E. coli.)ldcCの組込みによるジアミノペンタン産生株の構築のために使用されうる。ついで、pClick int sacB ICD ATG→GTGまたは組込まれると宿主細胞におけるICD活性の低下を招くいずれかの他のプラスミドが、リシン産生体に関して実施例1において「改変されたICD発現レベルを有する株の構築」に記載されている方法により、親株内に導入されうる。
1,5-DAP産生性に対するICDの改変発現の効果を分析するためには、該最適化株を親株の1,5-DAP産生性と比較する。
icdコード領域を欠失させるために、icdコード領域の下流の300-600の連続的ヌクレオチドに直接的に融合したicdコード配列の上流の約300-600の連続的ヌクレオチドを含有する欠失カセットをpClik int sacB内に挿入する。得られたプラスミドはpClik int sacBデルタicd(配列番号8)と称される。ついで該プラスミドを標準的な方法、例えばエレクトロポレーションによりC. glutamicum内に形質転換する。形質転換のための方法は、例えば、Thierbachら (Applied Microbiology and Biotechnology 29:356-362 (1988))、Dunican und Shivnan (Biotechnology 7:1067-1070 (1989))、Tauchら (FEMS Microbiological Letters 123,343-347 (1994))およびDE 10046870において見出される。
・該ゲノム内への第1相同組換え事象の後における、該プラスミドを成功裏に組込んだクローンの選択。この選択はカナマイシン含有寒天プレート上の増殖により達成される。その選択工程に加えて、コロニーPCRにより、組換えの成功が確認されうる。
ICD 上流: GAACAGATCACAGAATCCAACC
ICD 下流: TGGCGATGCACAATTCCTTG。
つぎに、より低いICD活性を有する突然変異配列により元のicd配列を置換するための1つの考えられうる方法に関して、更なる実験的詳細を説明する。
第1工程において、C. glutamicumでありうる宿主細胞内で機能するプロモーター、RBSおよびターミネーター配列のような全ての調節配列を含有する複製性プラスミド内にicdコード配列をクローニングする。理想的には、大腸菌(E. coli.)およびC. glutamicumにおいて複製されうるシャトルプラスミドを使用する。そのようなシャトルベクターの一例はpClik5aMCS(WO 2005/059093)である。より適当なシャトルベクターはEikmannsら (Gene (1991) 102:93-8) または“Handbook of Corynebacterium”(EggelingおよびBott編, ISBN 0-8493-1821-1, 2005)において見出されうる。それらにおいては、E. coli - C. glutamicumシャトルベクターの一覧(表23.1)およびE. coli - C. glutamicumシャトル発現ベクターの一覧(表23.2)が見出されうる。後者は、クローン化遺伝子の発現を導く適当なプロモーターを既に含有するため、後者が好ましい。
より低いICD活性を有する変異体により野生型icdコード領域を置換するために、2工程法を適用することが可能である。第1工程においては、野生型icd遺伝子のコード領域をゲノムから完全に欠失させる。破壊されたicdを有する細胞が生存可能であることを記載している文献が存在する(Eikmannsら (1995) J Bacteriol (1995) 177(3):774-782)。
icdの欠失の方法は実施例4に記載されている。得られた株はデルタicdと称される。
第2工程においては、変異体icdコード配列をデルタicd株内に挿入する。それを行うために、突然変異体icd配列を、適当な組込みプラスミド、例えば、実施例4における欠失構築物に使用された同じ約300-600の上流および下流ヌクレオチドに隣接したpClik int sacB(前記を参照されたい)内にクローニングする。突然変異体icdを含有するこのプラスミドをC. glutamicum内に形質転換したら、相同組換えの2つの連続的工程の後でicd遺伝子座内に突然変異体icdコード領域が挿入されたクローンを前記と同様の方法により特定することが可能である。突然変異体ICDコード領域に特異的なPCRプライマーを使用して、デルタicd株と陽性クローンとを識別することが可能である。
株「icd(mut)」のICD活性は、野生型icd遺伝子を含有する親株の活性と比較されるべきである。このための方法は実施例1に記載されている。
突然変異体icdによる野生型icdの前記置換は、発酵により種々の化学物質を産生する株において行われうる。
・リシン(例えば、LU11424, ATCC 13032 lysC(fbr); ATCC13287, 21300, 21513; 例えばEggelingおよびBott (編) Handbook of Corynebacterium” (Taylor and Francis Group, 2005) Chapter 20に記載されている)、
・メチオニン(例えば、WO 2007/012078, WO 2007/020295に記載されている)、
・ジアミノペンタン(WO 2007/113127, 実施例3)、
・ベータ-リシン(WO 2007/101867)、
・ジピコリナート(EP 08151031.5)、
・トレオニン(Colonら (1995) Appl Environ Microbiol 61:71-78; Eikmannsら (1991) Appl Micorbiol Biotechnol 34:617-622; Ishidaら (1994) Biosci Biotechnol Biochem 57:1755-1756; Kaseら (1974) Agric Biol Chem 38:993-1000)、
・イソロイシン(Morbachら (1996) Appl Environ Microbiol 62:4345-4351; Ishidaら (1993) Biosci Biotechnol Biochem 57:1755-1756)。
a)適当な上流配列(プロモーター + RBS)の特定
まず、天然icdプロモーターより弱い上流配列を特定する必要がある。該新規上流配列はCorynebacteriumまたは他の生物から誘導されうる。細菌、より具体的にはコリネフォルム細菌において機能する幾つかのプロモーター(RBSを含む)が特定されている。そのようなプロモーターの具体例はDE-A-44 40 118、Reinscheidら, Microbiology 145:503 (1999)、Patekら, Microbiology 142:1297 (1996)、WO 02/40679、DE-A-103 59 594、DE-A-103 59 595、DE-A-103 59 660およびDE-A-10 2004 035 065に記載されている。
Claims (5)
- 対応する初期微生物と比較して部分的に低下したイソクエン酸デヒドロゲナーゼ活性を有するCorynebacterium微生物を使用する、リシン又はトレハロースの製造方法。
- 該Corynebacterium微生物がCorynebacterium glutamicumである、請求項1記載の方法。
- 該Corynebacterium glutamicumがC. glutamicum ATCC13032、ATCC13032lysCfbrもしくはATCC13286またはこれらの株の1つの誘導体である、請求項1記載の方法。
- 該Corynebacterium微生物のイソクエン酸デヒドロゲナーゼ活性の部分的な低下が、イソクエン酸デヒドロゲナーゼコード化ヌクレオチド配列の開始コドンとしてのATGの置換によるものである、請求項1〜3のいずれか1項に記載の方法。
- イソクエン酸デヒドロゲナーゼコード化ヌクレオチド配列の開始コドンとしてのATGが、GTGに置換されたものである、請求項4記載の方法。
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BRPI0911770A2 (pt) | 2015-08-04 |
KR20130038944A (ko) | 2013-04-18 |
KR20110015422A (ko) | 2011-02-15 |
CN102124119A (zh) | 2011-07-13 |
KR101498753B1 (ko) | 2015-03-09 |
WO2009133114A1 (en) | 2009-11-05 |
EP2283142A1 (en) | 2011-02-16 |
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