JP2023511882A - L-分枝鎖アミノ酸生産能が強化された微生物及びそれを用いてl-分枝鎖アミノ酸を生産する方法 - Google Patents
L-分枝鎖アミノ酸生産能が強化された微生物及びそれを用いてl-分枝鎖アミノ酸を生産する方法 Download PDFInfo
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Abstract
Description
以下、実施例を挙げて本発明を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するものにすぎず、本発明がこれらの実施例に限定されるものではない。
実施例1-1.UV照射による人工突然変異の誘発
代表的な分枝鎖アミノ酸であるバリンの生産能が向上した変異株を選択するために、寒天を含む栄養培地にバリン生産菌株であるコリネバクテリウム・グルタミカムKCCM11201P(特許文献7)を塗抹し、30℃で36時間培養した。このようにして得られた数百個のコロニーに室温でUVを照射し、菌株のゲノムにランダム突然変異を誘発した。
親株として用いたコリネバクテリウム・グルタミカムKCCM11201Pに比べてL-バリンの生産能が向上した変異株を選択するために、ランダム突然変異を誘発した菌株を対象に発酵力価実験を行った。各コロニーを栄養培地で継代培養し、その後生産培地25mlを含有する250mlのコーナーバッフルフラスコに各菌株を接種し、30℃、200rpmで72時間振盪培養した。その後、HPLCを用いてL-バリンの濃度を分析した。分析したL-バリンの濃度を表1に示す。
栄養培地(pH7.2)
グルコース10g,肉汁5g,ポリペプトン10g,塩化ナトリウム2.5g,酵母エキス5g,寒天20g,尿素2g(蒸留水1リットル中)
生産培地(pH7.0)
グルコース100g,硫酸アンモニウム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,リン酸水素二カリウム1g,硫酸マグネシウム7水塩0.5g,ビオチン100μg,チアミンHCl 1mg,パントテン酸カルシウム2mg,ニコチンアミド3mg,炭酸カルシウム30g(蒸留水1リットル中)
バリン生産能が向上した前記A7菌株の主要遺伝子をシーケンシングし、KCCM11201P菌株及びコリネバクテリウム・グルタミカムATCC14067野生型菌株と比較した。その結果、前記A7菌株は、酢酸代謝調節因子A(regulators of acetate metabolism A, RamA)のプロモーター位置に変異を含むことが確認された。
実施例3-1.コリネバクテリウム・グルタミカムKCCM11201P菌株へのプロモーター変異の導入及びL-バリン生産能の評価
配列番号2で表されるramA遺伝子プロモーター変異型ポリヌクレオチドをコリネバクテリウム・グルタミカムKCCM11201Pに挿入するために、ターゲット変異を含むベクターを作製した。具体的には、前記A7菌株のゲノム(genomic)DNAをG-spin Total DNA抽出ミニキット(Intron社, Cat. No 17045)を用いて、キットのプロトコルに従って抽出した。前記ゲノムDNAを鋳型とし、PCRを行った。PCRの条件は、94℃で5分間の変性後、94℃で30秒間の変性、55℃で30秒間のアニーリング、及び72℃で150秒間の重合を25サイクル行い、次いで72℃で7分間の重合反応を行うものとした。配列番号9及び10を用いて、1114bpのPCR産物(以下、「変異導入断片1」という)を得た。
栄養培地(pH7.2)
グルコース10g,肉汁5g,ポリペプトン10g,塩化ナトリウム2.5g,酵母エキス5g,寒天20g,尿素2g(蒸留水1リットル中)
生産培地(pH7.0)
グルコース100g,硫酸アンモニウム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,リン酸水素二カリウム1g,硫酸マグネシウム7水塩0.5g,ビオチン100μg,チアミンHCl 1mg,パントテン酸カルシウム2mg,ニコチンアミド3mg,炭酸カルシウム30g(蒸留水1リットル中)
実施例3-1の結果から分かるように、ramA遺伝子プロモーター変異によりバリン生産能が向上することが確認されたので、さらにramA発現を増加させるために、配列番号2の変異型プロモーターに基づいて、ramAプロモーターの改良又は置換のためのベクターを作製した。
L-バリンを生産する他のコリネバクテリウム・グルタミカムに属する菌株においてもL-バリン生産能の向上効果があることを確認するために、野生株コリネバクテリウム・グルタミカムATCC14067に1種の変異[ilvN(A42V);非特許文献17]を導入することにより、L-バリン生産能が向上した菌株を作製した。
L-バリンを生産する他のコリネバクテリウム・グルタミカムに属する菌株においてもL-バリン生産能の向上効果があることを確認するために、実施例3-3と同様に野生株コリネバクテリウム・グルタミカムATCC13869に1種の変異[ilvN(A42V)]を導入することにより、L-バリン生産能を有するようになった変異株を作製し、前記組換え菌株をコリネバクテリウム・グルタミカムCJ8Vと命名した。
前記pDZ-Pm1-ramA、pDZ-Pm2-ramA、pDZ-Pm3-ramA、pDZ-Pcj7-ramAを染色体上での相同組換えによりコリネバクテリウム・グルタミカムKCCM11661P、KCCM11662Pに形質転換した(非特許文献15)。相同性配列の組換えにより染色体上にベクターが挿入された菌株は、カナマイシン(Kanamycin)25mg/lを含有する培地から選択した。その後、2次組換えが完了した前記コリネバクテリウム・グルタミカム形質転換株を対象に、配列番号9及び10を用いたPCRにより、染色体上でramAプロモーターが改良された菌株、及びPcj7に置換された菌株を確認し、前記組換え菌株をそれぞれコリネバクテリウム・グルタミカムKCCM11661P-Pm1-ramA、KCCM11661P Pm2-ramA、KCCM11661P-Pm3-ramA、KCCM11661P-Pcj7-ramA、KCCM11662P-Pm1-ramA、KCCM11662P Pm2-ramA、KCCM11662P-Pm3-ramA及びKCCM11662P-Pcj7-ramAと命名した。
<栄養培地(pH7.2)>
グルコース10g,肉汁5g,ポリペプトン10g,塩化ナトリウム2.5g,酵母エキス5g,寒天20g,尿素2g(蒸留水1リットル中)
<生産培地(pH7.0)>
グルコース50g,硫酸アンモニウム20g,コーンスティープソリッド(Corn Steep Solids)20g,リン酸水素二カリウム1g,硫酸マグネシウム7水塩0.5g,ビオチン100μg,チアミンHCl 1mg,炭酸カルシウム15g(蒸留水1リットル中)
L-イソロイシンを生産する他のコリネバクテリウム・グルタミカムに属する菌株においてもL-イソロイシン生産能の向上効果があることを確認するために、L-イソロイシン生産菌株コリネバクテリウム・グルタミカムKCCM11248P菌株を対象に、実施例3-1、3-2と同様にそれぞれのベクターを形質転換させた菌株を作製し、それぞれコリネバクテリウム・グルタミカムKCCM11248P-Pm-ramA、KCCM11248P-Pm1-ramA、KCCM11248P-Pm2-ramA、KCCM11248P-Pm3-ramA及びKCCM11248P-Pcj7-ramAと命名した。前記KCCM11248P-Pm-ramA、KCCM11248P-Pm1-ramA、KCCM11248P-Pm2-ramA、KCCM11248P-Pm3-ramA及びKCCM11248P-Pcj7-ramA菌株を次の方法で培養してイソロイシン生産能を評価した。
<種培地(pH7.0)>
グルコース20g,ペプトン10g,酵母抽出物5g,要素1.5g,KH2PO44g,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50g,(NH4)2SO412.5g,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)
Claims (13)
- 酢酸代謝調節因子A(regulators of acetate metabolism A)の活性が強化された、
L-分枝鎖アミノ酸生産微生物。 - 前記活性強化は、
酢酸代謝調節因子A遺伝子発現調節配列に変異を導入するか、
前記遺伝子発現調節配列を、発現を向上させる配列に置換するか、
活性が強化されるように当該遺伝子に変異をさらに導入するか、
又はそれらの組み合わせにより達成される、
請求項1に記載の微生物。 - 前記遺伝子発現調節配列はプロモーターである、
請求項2に記載の微生物。 - 配列番号1で表されるポリヌクレオチド配列の34番目、36番目、37番目、41番目及び43番目のヌクレオチドから選択される少なくとも1つの位置に相当する位置において、他のヌクレオチドへの置換を有し、プロモーター活性を有するポリヌクレオチドを含む、
請求項2に記載の微生物。 - 前記ポリヌクレオチドは、
配列番号1で表されるポリヌクレオチド配列の34番目のヌクレオチドがTに置換されるか、
36番目のヌクレオチドがTに置換されるか、
37番目のヌクレオチドがGに置換されるか、
41番目のヌクレオチドがTに置換されるか、
43番目のヌクレオチドがAに置換されるか、
又はそれらの組み合わせを含む、
請求項4に記載の微生物。 - 前記ポリヌクレオチドは、配列番号3~5から選択されるいずれかのヌクレオチド配列からなる、
請求項4に記載の微生物。 - 前記微生物はコリネバクテリウム属である、
請求項1に記載の微生物。 - 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・グルタミカムを含む、
請求項7に記載の微生物。 - 請求項1~8のいずれか一項に記載の微生物を培地で培養するステップを含む、
L-分枝鎖アミノ酸を生産する方法。 - 前記培地又は微生物から回収又は分離するステップをさらに含む、
請求項9に記載のL-分枝鎖アミノ酸を生産する方法。 - 配列番号1で表されるポリヌクレオチド配列の34番目、36番目、37番目、41番目及び43番目のヌクレオチドから選択される少なくとも1つの位置に相当する位置において、他のヌクレオチドへの置換を有し、プロモーター活性を有する、
ポリヌクレオチド。 - 前記ポリヌクレオチドは、
配列番号1で表されるポリヌクレオチド配列の34番目のヌクレオチドがTに置換されるか、
36番目のヌクレオチドがTに置換されるか、
37番目のヌクレオチドがGに置換されるか、
41番目のヌクレオチドがTに置換されるか、
43番目のヌクレオチドがAに置換されるか、
又はそれらの組み合わせを含む、
請求項11に記載のポリヌクレオチド。 - 前記ポリヌクレオチドは、配列番号3~5から選択されるいずれかのヌクレオチド配列からなる、
請求項11に記載のポリヌクレオチド。
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