JP6759484B1 - 新規なアスパルトキナーゼ変異体及びそれを用いたl−アミノ酸の製造方法 - Google Patents
新規なアスパルトキナーゼ変異体及びそれを用いたl−アミノ酸の製造方法 Download PDFInfo
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Abstract
Description
アスパルトキナーゼタンパク質の構造モデリングを用いて野生型より活性が強化される変異を選択し、次のように前記変異を導入した菌株を作製した。
前記実施例で得られたCA01−2307及びCA01−2308菌株並びにWT菌株のアスパラギン酸由来主要アミノ酸生産能を比較するために、次の方法で培養して培養液成分を分析した。
グルコース20g,ペプトン10g,酵母抽出物5g,尿素1.5g,KH2PO4 4g,K2HPO4 8g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミンHCl 1000μg,パントテン酸カルシウム2000μg,ニコチンアミド2000μg(蒸留水1リットル中)
<生産培地(pH7.0)>
グルコース100g,(NH4)2SO4 40g,大豆タンパク質2.5g,コーンスティープソリッド(Corn Steep Solids)5g,尿素3g,KH2PO4 1g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミン塩酸塩1000μg,パントテン酸カルシウム2000μg,ニコチンアミド3000μg,CaCO3 30g(蒸留水1リットル中)
実施例2の結果に基づいて、リシン生産能が相対的に高いlysC(L377K)変異導入によるL−トレオニン生産能の変化を明確に確認するために、L−トレオニン、L−イソロイシン、L−メチオニン及びHomoserine誘導体生合成経路の共通の中間体であるホモセリン(homoserine)を生産するホモセリンデヒドロゲナーゼ(homoserin dehydrogenase)をコードする遺伝子に変異を導入した。具体的には、実施例1で作製したCA01−2307菌株に公知のhom(G378E)変異(非特許文献14)が導入された菌株を作製した。また、その対照群として、WTにhom(G378E)変異が導入された菌株も作製した。hom(G378E)を導入するベクターを作製するために、WT genomic DNAを鋳型とし、配列番号13及び14、配列番号15及び16を用いてPCRを行った。PCR条件は、95℃で5分間の変性後、95℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で30秒間の重合を30回繰り返し、その後72℃で7分間の重合反応を行った。
lysC(L377K)変異導入によりL−イソロイシン生産能に及ぼす効果を確認するために、公知のトレオニンデヒドラターゼ(L-threonine dehydratase)をコードする遺伝子ilvA(V323A)変異(非特許文献15)発現を強化するベクターを作製した。
lysC(L377K)変異導入によりO−アセチル−ホモセリンの生産に及ぼす影響を把握するために、O−アセチル−ホモセリン分解経路であるシスタチオニンγ−シンターゼをコードするmetB遺伝子とO−アセチルホモセリン(チオール)−リアーゼをコードするmetY遺伝子を欠損させ、O−アセチル−ホモセリン生合成酵素であるホモセリンO−アセチルトランスフェラーゼをコードするmetX遺伝子を過剰発現させることにより、O−アセチル−ホモセリン生産菌株を作製した。まず、metB遺伝子を欠損させるために、WT由来のmetB遺伝子の塩基配列情報に基づいて、metB遺伝子の5’上端部を増幅するためのプライマー対(配列番号21及び22)、及び3’下端部を増幅するためのプライマー対(配列番号23及び24)を考案した。
グルコース100g,(NH4)2SO4 40g,大豆タンパク質2.5g,コーンスティープソリッド(Corn Steep Solids)5g,尿素3g,KH2PO4 1g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミン塩酸塩1000μg,パントテン酸カルシウム2000μg,ニコチンアミド3000μg,CaCO3 30g,L−methionine 0.3g(蒸留水1リットル中)。
lysC(L377K)変異導入によりO−スクシニルホモセリンの生産能に及ぼす影響を把握するために、O−スクシニルホモセリン生産菌株を作製した。コリネバクテリウム・グルタミカム野生型菌株は自然にO−スクシニルホモセリンを生産することができないので、実施例5で作製したO−アセチルトランスフェラーゼ(MetX)酵素の基質結合部位アミノ酸置換によりO−スクシニルトランスフェラーゼ(MetA)活性を有するように改変し、O−スクシニルホモセリンを生成させることにした。よって、WT由来のmetX遺伝子配列に基づいて、実施例のmetX変異を導入するベクターを作製するためのプライマー対(配列番号31及び32)を考案した。
Claims (8)
- 配列番号1のアミノ酸配列において377番目のアミノ酸がL−リシン又はL−メチオニンに置換されたアスパルトキナーゼ変異体。
- 請求項1に記載の変異体をコードするポリヌクレオチド。
- 請求項1に記載のアスパルトキナーゼ変異体を含む、アスパラギン酸由来L−アミノ酸又はそのアミノ酸誘導体を生産するコリネバクテリウム属微生物であって、前記アスパラギン酸由来L−アミノ酸又はそのアミノ酸誘導体は、リシン、トレオニン、メチオニン、ホモセリン、O−アセチルホモセリン、O−スクシニルホモセリン、イソロイシン及びカダベリンからなる群から選択されるものである、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は、コリネバクテリウム・グルタミカムである、請求項3に記載の微生物。
- 請求項3に記載の微生物を培地で培養するステップと、
前記培養した微生物又は培地からアスパラギン酸由来L−アミノ酸又はそのアミノ酸誘導体を回収するステップとを含む、
アスパラギン酸由来L−アミノ酸又はアミノ酸誘導体の生産方法であって、
前記アスパラギン酸由来L−アミノ酸又はそのアミノ酸誘導体は、リシン、トレオニン、メチオニン、ホモセリン、O−アセチルホモセリン、O−スクシニルホモセリン、イソロイシン及びカダベリンからなる群から選択されるものである、生産方法。 - 前記コリネバクテリウム属微生物は、コリネバクテリウム・グルタミカムである、請求項5に記載の生産方法。
- 請求項3に記載の微生物を培地で培養するステップと、
前記培養した微生物又は培地からO−アセチルホモセリン又はO−スクシニルホモセリンを生産するステップと、
前記O−アセチルホモセリン又はO−スクシニルホモセリンをL−メチオニンに変換するステップとを含む、L−メチオニンの生産方法。 - 前記コリネバクテリウム属微生物は、コリネバクテリウム・グルタミカムである、請求項7に記載の生産方法。
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