JP2015500660A - L−リジン生産能を有する微生物を用いてl−リジンを生産する方法 - Google Patents
L−リジン生産能を有する微生物を用いてl−リジンを生産する方法 Download PDFInfo
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- JP2015500660A JP2015500660A JP2014548685A JP2014548685A JP2015500660A JP 2015500660 A JP2015500660 A JP 2015500660A JP 2014548685 A JP2014548685 A JP 2014548685A JP 2014548685 A JP2014548685 A JP 2014548685A JP 2015500660 A JP2015500660 A JP 2015500660A
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- lysine
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- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
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- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
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- 150000007523 nucleic acids Chemical group 0.000 description 1
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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- 150000007524 organic acids Chemical class 0.000 description 1
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- 230000004108 pentose phosphate pathway Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
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- 239000011574 phosphorus Substances 0.000 description 1
- 229920001522 polyglycol ester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- JQXXHWHPUNPDRT-WLSIYKJHSA-N rifampicin Chemical compound O([C@](C1=O)(C)O/C=C/[C@@H]([C@H]([C@@H](OC(C)=O)[C@H](C)[C@H](O)[C@H](C)[C@@H](O)[C@@H](C)\C=C\C=C(C)/C(=O)NC=2C(O)=C3C([O-])=C4C)C)OC)C4=C1C3=C(O)C=2\C=N\N1CC[NH+](C)CC1 JQXXHWHPUNPDRT-WLSIYKJHSA-N 0.000 description 1
- 229960001225 rifampicin Drugs 0.000 description 1
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- 239000006152 selective media Substances 0.000 description 1
- 238000002741 site-directed mutagenesis Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 229940001941 soy protein Drugs 0.000 description 1
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- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- WPLOVIFNBMNBPD-ATHMIXSHSA-N subtilin Chemical compound CC1SCC(NC2=O)C(=O)NC(CC(N)=O)C(=O)NC(C(=O)NC(CCCCN)C(=O)NC(C(C)CC)C(=O)NC(=C)C(=O)NC(CCCCN)C(O)=O)CSC(C)C2NC(=O)C(CC(C)C)NC(=O)C1NC(=O)C(CCC(N)=O)NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C1NC(=O)C(=C/C)/NC(=O)C(CCC(N)=O)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)CNC(=O)C(NC(=O)C(NC(=O)C2NC(=O)CNC(=O)C3CCCN3C(=O)C(NC(=O)C3NC(=O)C(CC(C)C)NC(=O)C(=C)NC(=O)C(CCC(O)=O)NC(=O)C(NC(=O)C(CCCCN)NC(=O)C(N)CC=4C5=CC=CC=C5NC=4)CSC3)C(C)SC2)C(C)C)C(C)SC1)CC1=CC=CC=C1 WPLOVIFNBMNBPD-ATHMIXSHSA-N 0.000 description 1
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- AYEKOFBPNLCAJY-UHFFFAOYSA-O thiamine pyrophosphate Chemical compound CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N AYEKOFBPNLCAJY-UHFFFAOYSA-O 0.000 description 1
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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的に示すものであり、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。
組換えベクターは、pDZ(特許文献4参照)を基本ベクターとして用いた。作製過程は次の通りである。
コリネバクテリウムグルタミカム由来lysC遺伝子を確保するために、人工変異法により作製されたリジン生産菌株(コリネバクテリウムグルタミカムKCCM11016P)の染色体DNAを鋳型として用いた。米国国立保健研究所の遺伝子バンク(NIH GenBank)に基づいてlysC遺伝子(NCBI登録番号NC_003450,Ncgl0247)の開始コドン部位を含む塩基配列を確保し(配列番号13)、これに基づいて開始コドンをGTGからATGに置換するための2対のプライマー(表1,配列番号1〜4)を合成した。
作製したpDZ−lysC(ATG)ベクターをKCCM11016Pに電気パルス法で形質転換し(非特許文献7による形質転換法を用いる)、その後カナマイシン25mg/Lを含有する選択培地で染色体上の同遺伝子との相同性に基づいて挿入された菌株を選択した。ベクターの染色体挿入が成功したか否かは、X−gal(5−ブロモ−4−クロロ−3−インドリル−β−D−ガラクトシド)を含む固体培地で青色を示すか否かにより確認することができる。染色体が1次挿入された菌株を栄養培地で振盪培養(30℃,8時間)し、その後それぞれ10−4から10−10に希釈し、X−galを含む固体培地に塗抹した。ほとんどのコロニーが青色を示すのに対して、低い割合で出現する白色のコロニーを選択することにより、2次交差(crossover)によりlysCの開始コドン部位の塩基配列が置換された菌株を選択した。選択した菌株の開始コドンの塩基置換が行われたか否かは、配列番号1及び4のプライマーを用いてPCRを行い、その後標的部位の塩基配列分析過程を経て最終確認した。
tkt遺伝子は配列上に開始コドンと予想される2つのコドンが存在するが、RBS(リポゾーム結合部位)との距離プロテオミクス(proteomics)の結果とに基づいて、本発明においては下流に存在するコドンを開始コドンとした。
コリネバクテリウムグルタミカム由来tkt遺伝子を確保するために、KCCM11016Pの染色体DNAを鋳型として用いた。米国国立保健研究所のジェンバンク(NIH GenBank)に基づいてtkt遺伝子(NCBI登録番号NC_003450,Ncgl1512)の開始コドン部位を含む塩基配列を確保し(配列番号14)、これに基づいて開始コドンをTTGからATGに置換するための2対のプライマー(表2,配列番号5〜8)を合成した。
作製したpDZ−tkt(ATG)ベクターを実施例1−2と同じ過程でリジン生産菌株KCCM11016Pに形質転換し、2次交差過程を経て染色体上でtktの開始コドンがATGに置換されたKCCM11016P−tktを得た。遺伝子の開始コドンの塩基置換が行われた否かは、配列番号5及び8のプライマーを用いてPCRを行い、その後標的部位の塩基配列分析により最終確認した。
(1)pDZ−pyc(ATG)組換えベクターの作製
コリネバクテリウムグルタミカム由来pyc遺伝子を確保するために、KCCM11016Pの染色体DNAを鋳型として用いた。米国国立保健研究所のジェンバンクに基づいてpyc遺伝子(NCBI登録番号NC_003450,Ncgl0659)の開始コドン部位を含む塩基配列を確保し(配列番号15)、これに基づいて開始コドンをGTGからATGに置換するための2対のプライマー(表3,配列番号9〜12)を合成した。
作製したpDZ−pyc(ATG)ベクターを実施例1−2と同じ過程でリジン生産菌株KCCM11016Pに形質転換し、2次交差過程を経て染色体上でpycの開始コドンがATGに置換されたKCCM11016P−pycを得た。遺伝子の開始コドンの塩基置換が行われたか否かは、配列番号9及び12のプライマーを用いてPCRを行い、その後標的部位の塩基配列分析により最終確認した。
対数期の菌体を遠心分離(5,000rpm,15分)により回収し、0.1%Tris.HCl(pH8.0)緩衝液で3回洗浄し、その後同緩衝液で610nmの濁度が160程度になるように懸濁した。懸濁液1.5ml当たり1.25gのガラスビーズ(glass bead)を添加し、その後ビーズ式粉砕機(bead beater)を用いて6分間菌体を破砕した。遠心分離(15,000rpm,20分)により上清を回収し、ブラッドフォード方法(非特許文献8)によりタンパク質濃度を定量し、その後アスパラギン酸キナーゼ(LysC)酵素活性の測定のための粗タンパク質溶液として用いた。LysC酵素活性の測定は、0.1M Tris.HCl(pH8.0)、0.01M塩化マグネシウム(MgCl2)、0.6M塩酸ヒドロキシルアミン(Hydroxylamine.HCl)(pH7.0)、4mM ATP、0.2Mアスパラギン酸塩(Aspartate)を含む反応液に0.05mlの粗タンパク質溶液を添加することにより反応を開始した。30℃で30分間反応させ、その後停止液(stop solution)(10%FeCl2,3.3%TCA,0.7N HCl)を添加して反応を終了させ、遠心分離により上清を回収し、540nmで吸光度を測定した。LysC酵素活性単位(U)は、1分間に1mgのタンパク質を生成するアスパラギン酸塩ヒドロキサメートのnmoleと定義した。
対数期の菌体を遠心分離(5,000rpm,15分)により回収し、0.1%Tris.HCl(pH7.5)緩衝液で3回洗浄し、その後同緩衝液で610nmの濁度が160程度になるように懸濁した。懸濁液1.5ml当たり1.25gのガラスビーズを添加し、その後ビーズ式粉砕機を用いて6分間菌体を破砕した。遠心分離(15,000rpm,20分)により上清を回収し、ブラッドフォード方法によりタンパク質濃度を定量し、その後トランスケトラーゼ(Tkt)酵素活性の測定のための粗タンパク質溶液として用いた。Tkt酵素活性の測定は、1ml当たり0.1M Tris.HCl(pH7.5)、10mM D−R5P、2mM D−Xu5P、10μM ThDP、1.2mM MgCl2、100μM NADH、1unitトリオースリン酸イソメラーゼ(triosephosphate isomerase)、1unitグリセロール−3−リン酸デヒドロゲナーゼ(glycerol-3-phosphate dehydrogenase)を含む反応液に粗タンパク質溶液を添加することにより反応を開始した。30℃で20〜30分間反応させ、340nmで吸光度を測定した。Tkt酵素活性単位(U)は、1分間に1μmolのグリセルアルデヒド3−リン酸(glyceraldehyde 3-phosphate)の形成を促進する酵素の量(mg)と定義し、比活性度(specific activity)はunits/mgと定義した(非特許文献9)。
対数期の菌体を遠心分離(5,000rpm,15分)により回収し、50mM塩化ナトリウムを含む50mM Tris.HCl(pH6.3)緩衝液で2回洗浄し、その後20%グリセリンを含む100mM HEPES(pH7.5)緩衝液で懸濁した。懸濁液にCTABを0.3%となるように添加し、その後氷中に1分間放置した。菌体を遠心分離(5,000rpm,10分)により回収し、その後100mM Tris.HCl(pH7.3)緩衝液で懸濁した。ブラッドフォード方法によりタンパク質濃度を定量し、その後ピルビン酸カルボキシラーゼ(Pyc)酵素活性の測定のための粗タンパク質溶液として用いた。Pyc酵素活性の測定は、25mM NaHCO3、5mM MgCl2、3mMピルビン酸塩、4mM ATPを含む反応液に粗タンパク質を添加することにより反応を開始した。30℃で1.5分間反応させ、その後80μlの停止液(30% ο-リン酸)を添加して反応を終了させ、遠心分離(12,000rpm,15分,4℃)により上清を回収した。1ml当たり50μlの上清、150mM Tris.HCl(pH7.8)、150μM NADH、2.5U乳酸デヒドロゲナーゼ(lactate dehydrogenase)を添加し、その後37℃、340nmで吸光度を測定した。Pyc酵素活性単位(U)は、1分間に1mgのタンパク質を生成する乳酸塩のnmoleと定義した。
組換えベクターは、実施例1、2、3で作製したpDZ−lysC(ATG)、pDZ−tkt(ATG)、pDZ−pyc(ATG)を用いた。作製過程は次の通りである。
実施例1、2、3、7で最終的に作製したKCCM11016P−lysC、KCCM11016P−tkt、KCCM11016P−pyc、KCCM11016P−lysC−tkt、KCCM11016P−lysC−pyc、KCCM11016P−lysC−pyc−tktをL−リジンの生産のために下記の方法で培養した。
原糖20g,ペプトン10g,酵母抽出物5g,尿素1.5g,KH2PO4 4g,K2HPO4 8g,MgSO47H2O 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)
ブドウ糖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,MgSO47H2O 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)
コリネバクテリウムグルタミカムに属する他のリジン生産菌株においても、lysC、pyc、tkt遺伝子の開始コドンをATGに置換した場合にリジン生産能増加効果があるかを確認するために、L−リジン生産菌株であるコリネバクテリウムグルタミカムKFCC10750(特許文献7)に、実施例8で最も優れたリジン生産能増加効果を示した3種の形質を全て導入した組換え菌株を作製し、KFCC10750−lysC−pyc−tktと命名した。実施例8と同様の方法で培養し、そのL−リジン濃度を分析した(表8)。
他のL−リジン生産菌株であるコリネバクテリウムグルタミカムKCCM10770P(特許文献4)に、実施例8で最も優れたリジン生産能増加効果を示した3種の形質を全て導入した組換え菌株を作製し、KCCM10770P−lysC−pyc−tktと命名した。実施例8と同様の方法で培養し、そのL−リジン濃度を分析した(表9)。
さらに他のL−リジン生産菌株であるコリネバクテリウムグルタミカムCJ3P(非特許文献3)に、実施例8で最も優れたリジン生産能増加効果を示した3種の形質を全て導入した組換え菌株を作製し、CJ3P−lysC−pyc−tktと命名した。実施例8と同様の方法で培養し、そのL−リジン濃度を分析した(表10)。
Claims (9)
- アスパラギン酸キナーゼ(LysC)、トランスケトラーゼ(Tkt)、又はピルビン酸カルボキシラーゼ(Pyc)をコードするそれぞれのポリヌクレオチドの開始コドンをATGに置換した変異型ポリヌクレオチド。
- 前記アスパラギン酸キナーゼ(LysC)又はピルビン酸カルボキシラーゼ(Pyc)をコードするポリヌクレオチドの開始コドンがGTGであり、前記トランスケトラーゼ(Tkt)をコードするポリヌクレオチドの開始コドンがTTGである請求項1に記載の変異型ポリヌクレオチド。
- 前記変異型ポリヌクレオチドが、配列番号16、17又は18の塩基配列で表される請求項1に記載の変異型ポリヌクレオチド。
- ATGに置換された開始コドンを有する、アスパラギン酸キナーゼ、トランスケトラーゼ又はピルビン酸カルボキシラーゼをコードする変異型ポリヌクレオチドを少なくとも1つ含むベクター。
- ATGに置換された開始コドンを有する、アスパラギン酸キナーゼ、トランスケトラーゼ又はピルビン酸カルボキシラーゼをコードする変異型ポリヌクレオチドを少なくとも1つ含むことにより、前記酵素の少なくとも1つの酵素の活性が内在的活性より増加した微生物。
- 前記微生物が、請求項4のベクターで形質転換された請求項5に記載の微生物。
- 前記微生物が、コリネバクテリウム属微生物である請求項5に記載の微生物。
- 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7に記載の微生物。
- 請求項5〜8のいずれかによる微生物を培養する工程と、
前記培養した微生物又は培養培地からL−リジンを回収する工程とを含む、L−リジンを生産する方法。
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