JP7286758B2 - α-グルコシダーゼの活性が強化されたL-アミノ酸を生産する微生物及びそれを用いたL-アミノ酸生産方法 - Google Patents
α-グルコシダーゼの活性が強化されたL-アミノ酸を生産する微生物及びそれを用いたL-アミノ酸生産方法 Download PDFInfo
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Description
α-グルコシダーゼであるaglA遺伝子の効果を確認するために、例としてビフィドバクテリウム・アドレセンティス(Bifidobacterium adolescentis)由来のaglA遺伝子(配列番号2)をコリネバクテリウム・グルタミカム(Corynebacterium glutamicum)菌株の染色体上に挿入するためのベクターを作製した。コリネバクテリウム・グルタミカム由来のPgapAプロモーターを増幅するために、PgapAプロモーターの5'末端にEcoRI制限酵素部位が挿入されるように考案したプライマー(配列番号3)、及び3'末端にNdeI制限酵素部位が挿入されるように考案したプライマー(配列番号4)を合成した。その結果、5'末端にEcoRI制限酵素部位を含み、3'末端にNdeI制限酵素部位を含むPgapAプロモーターDNA断片が得られた。PCR条件は、94℃で5分間の変性を行い、その後94℃で30秒間の変性、56℃で30秒間のアニーリング、72℃で30秒間の重合を30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。
PgapAプロモーター増幅用プライマー
正方向:5'-TCAGAATTCTTGGGATTACCATTGAAGCC-3'(配列番号3)
逆方向:5'-TCACATATGGTGTCTCCTCTAAAGATTGT-3'(配列番号4)
α-グルコシダーゼをコードする遺伝子をコリネバクテリウム・グルタミカム菌株に導入するために、実施例1で作製したベクター6種をそれぞれコリネバクテリウム・グルタミカムのリシン生産株であるKCCM11016P(前記微生物は、KFCC10881として公開され、ブダペスト条約上の国際寄託機関に寄託番号KCCM11016Pとして再寄託された;特許文献6)に電気パルス法(非特許文献14)で形質転換し、相同染色体組換えにより各遺伝子が導入されたコロニーを選択した。PCR法によりコロニーを選択するために、配列番号18及び19のプライマーを用いた。
aglA遺伝子導入確認用プライマー
正方向:5'-GACCATTTATTCGCAACTGTG-3'(配列番号18)
逆方向:5'-TCTGCAAGGCGTTCGGAATT-3'(配列番号19)
親株であるコリネバクテリウム・グルタミカムKCCM11016Pを対照群として用いて、実施例2で作製したKCCM11016P::PgapA-SP1-aglA(B.al)、KCCM11016P::PgapA-SP2-aglA(B.al)、KCCM11016P::PgapA-SP3-aglA(B.al)、KCCM11016P::PgapA-SP4-aglA(B.al)、KCCM11016P::PgapA-SP3-malL(E.am)、及びKCCM11016P::PgapA-SP3-Ima1(S.ce)の6種を実施例4に示す方法で培養し、その後高速遠心分離して上清を得た。得られた上清の一部を用いて、SDS-PAGE法により培養培地中のα-グルコシダーゼ酵素の発現を測定した。その結果、70Kdaの位置に発現したタンパク質が確認された(図1)。
親株であるコリネバクテリウム・グルタミカムKCCM11016Pを対照群として用いて、実施例2で作製したKCCM11016P::PgapA-SP1-aglA(B.al)、KCCM11016P::PgapA-SP2-aglA(B.al)、KCCM11016P::PgapA-SP3-aglA(B.al)、KCCM11016P::PgapA-SP4-aglA(B.al)、KCCM11016P::PgapA-SP3-malL(E.am)、及びKCCM11016P::PgapA-SP3-Ima1(S.ce)の6種を次の方法で所定時間培養し、その後リシン濃度を測定した。その結果を表2に示す。まず、種培地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20時間振盪培養した。次に、生産培地24mlを含有する250mlのコーナーバッフルフラスコに1mlの種培養液を接種し、32℃、200rpmで72時間振盪培養した。前記種培地及び生産培地の組成は、それぞれ次の通りである。培養終了後に、HPLC(Waters 2478)によりL-リシンの濃度を測定した。
<種培地(pH7.0)>
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HCl 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)
L-リ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前記と同じ効果があるか否かを確認するために、野生型コリネバクテリウム・グルタミカムATCC13032菌株に3種の変異[pyc(P458S),hom(V59A),lysC(T311I)]を導入し、L-リシン生産能を獲得したコリネバクテリウム・グルタミカムCJ3P(非特許文献15)菌株を対象に、実施例2の方法でPgapA-SP3-aglA(B.al)を導入し、α-グルコシダーゼが導入された菌株を作製した。前述したように作製した菌株をCJ3P::PgapA-SP3-aglA(B.al)と命名した。対照群であるCJ3P菌株とCJ3P::PgapA-SP3-aglA(B.al)を実施例4と同様に培養し、リシン生産能を分析した。その結果を表3に示す。
α-グルコシダーゼの導入による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て強化した。具体的には、実施例5で用いたCJ3P::PgapA-SP3-aglA(B.al)菌株に公知のhom(G378E)変異(非特許文献16)が導入された菌株を作製した。また、その対照群として、CJ3Pにhom(G378E)変異のみが導入された菌株も作製した。変異導入のための組換えベクターは、次の方法で作製した。
XbaI認識部位挿入用プライマー
5'断片:5'-TCCTCTAGACTGGTCGCCTGATGTTCTAC-3'(配列番号20)
3'断片:5'-GACTCTAGATTAGTCCCTTTCGAGGCGGA-3'(配列番号21)
hom遺伝子置換用プライマー
5'-GCCAAAACCTCCACGCGATC-3'(配列番号22)
5'-ATCGCGTGGAGGTTTTGGCT-3'(配列番号23)
α-グルコシダーゼの導入が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に変異を導入して強化した。具体的には、実施例6で用いたCJ3P::PgapA-SP3-aglA(B.al)-hom(G378E)菌株に公知のilvA(V323A)変異(非特許文献17)が導入された菌株を作製した。また、その対照群としてCJ3P::hom(G378E)にilvA(V323A)変異のみが導入された菌株も作製した。変異導入のための組換えベクターは、次の方法で作製した。
XbaI認識部位挿入用プライマー
5'断片:5'-ACGGATCCCAGACTCCAAAGCAAAAGCG-3'(配列番号24)
3'断片:5'-ACGGATCCAACCAAACTTGCTCACACTC-3'(配列番号25)
ilvA遺伝子置換用プライマー
5’-ACACCACGGCAGAACCAGGTGCAAAGGACA-3’(配列番号26)
5’-CTGGTTCTGCCGTGGTGTGCATCATCTCTG-3’(配列番号27)
Claims (12)
- α-グルコシダーゼの活性が強化されたL-アミノ酸を生産するコリネバクテリウム属(the genus of Corynebacterium)微生物であって、
前記α-グルコシダーゼは、ビフィドバクテリウム・アドレセンティス(Bifidobacterium adolescentis)、エルウィニア・アミロボラ(Erwinia amylovora)、又はサッカロマイセス・セレビシエ(Saccharomyces cerevisiae)のα-グルコシダーゼである、微生物。 - 前記α-グルコシダーゼは、ビフィドバクテリウム・アドレセンティスのα-グルコシダーゼである、請求項1に記載の微生物。
- 前記α-グルコシダーゼは、aglA遺伝子によりコードされるものである、請求項1に記載の微生物。
- 前記α-グルコシダーゼは、配列番号1、28又は29のアミノ酸配列を含むタンパク質である、請求項1に記載の微生物。
- 前記L-アミノ酸は、L-リシン、L-トレオニン及びL-イソロイシンからなる群から選択される少なくとも1つである、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(Corynebacterium glutamicum)である、請求項1に記載の微生物。
- α-グルコシダーゼの活性が強化されたL-アミノ酸を生産するコリネバクテリウム属(the genus of Corynebacterium)微生物を培地で培養することを含む、L-アミノ酸の生産方法であって、
前記α-グルコシダーゼは、ビフィドバクテリウム・アドレセンティス(Bifidobacterium adolescentis)、エルウィニア・アミロボラ(Erwinia amylovora)、又はサッカロマイセス・セレビシエ(Saccharomyces cerevisiae)のα-グルコシダーゼである、生産方法。 - 前記培養した培地又は微生物からL-アミノ酸を回収することをさらに含む、請求項7に記載のL-アミノ酸の生産方法。
- 前記α-グルコシダーゼは、ビフィドバクテリウム・アドレセンティスのα-グルコシダーゼである、請求項7に記載のL-アミノ酸の生産方法。
- 前記α-グルコシダーゼは、aglA遺伝子によりコードされるものである、請求項7に記載のL-アミノ酸の生産方法。
- 前記α-グルコシダーゼは、配列番号1、28又は29のアミノ酸配列を含むタンパク質である、請求項7に記載のL-アミノ酸の生産方法。
- 前記L-アミノ酸は、L-リシン、L-トレオニン及びL-イソロイシンからなる群から選択される少なくとも1つである、請求項7に記載のL-アミノ酸の生産方法。
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BR112019019867A2 (pt) | 2021-04-13 |
RU2732338C1 (ru) | 2020-09-15 |
AU2019349396A1 (en) | 2021-04-15 |
EP3656863A4 (en) | 2021-04-14 |
KR102112240B1 (ko) | 2020-05-18 |
BR112019019867B1 (pt) | 2022-05-10 |
EP3656863A1 (en) | 2020-05-27 |
ZA202101456B (en) | 2022-06-29 |
US20210017510A1 (en) | 2021-01-21 |
PE20210686A1 (es) | 2021-04-08 |
KR20200036647A (ko) | 2020-04-07 |
CN111247250A (zh) | 2020-06-05 |
CL2021000629A1 (es) | 2021-09-24 |
JP2021534765A (ja) | 2021-12-16 |
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