JP5618164B2 - 外来種由来のグリセルアルデヒド−3−ホスフェートデヒドロゲナーゼの活性を獲得したコリネバクテリウム属のl−リシン生産方法 - Google Patents
外来種由来のグリセルアルデヒド−3−ホスフェートデヒドロゲナーゼの活性を獲得したコリネバクテリウム属のl−リシン生産方法 Download PDFInfo
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Description
ストレプトコッカス由来のgapN遺伝子の塩基配列は、既に明らかになって公開されている。アメリカ国立保健院ジーンバンク(NIH GenBank)からストレプトコッカス・ミュータンス(Streptococcus mutans)のgapN遺伝子情報(登録番号NC_004350)を確保した。報告された塩基配列に基づいて下記表1で記載された1対のプライマーを合成し、ストレプトコッカス・ミュータンスATCC25175菌株の染色体DNAを鋳型にして連鎖重合法(PCR法)[Sambrook et al, Molecular Cloning, a Laboratory Manual (1989), Cold Spring Harbor Laboratories](PCR条件:変性=94℃、30秒/アニーリング=50℃、30秒/重合反応=72℃、1分30秒、30回)によって1428塩基対のgapN遺伝子を増幅した後、TOPO Cloning Kit(Invitrogen)を用いて大膓菌プラスミドpCR2.1にクローニングしてpCR−gapN1プラスミドを得た。
実施例1で得たgapN遺伝子が含まれたベクターpCR−gapN1をそれぞれ、制限酵素NdeIとXbaIに切断してgapNを暗号化する遺伝子断片のみを分離した後、大膓菌とコリネバクテリウムシャトルベクターであるpECCG122(参照;大韓民国特許公開番号1992−0000933に公知される)に発現プロモーターであるPcj7(参照;大韓民国特許公開番号2006−0068505に公知される)を接合してpECCG122−Pcj7−gapN1を製作した(図1)。
ストレプトコッカス由来のgapN遺伝子の塩基配列は、既に明らかになって公開されている。アメリカ国立保健院ジーンバンク(NIH GenBank)からストレプトコッカス・アガラクチア(Streptococcus agalactiae)のgapN遺伝子情報(登録番号NC_004116)を確保した。報告された塩基配列に基づいて下記表2で記載された1対のプライマーを合成し、ストレプトコッカス・アガラクチアATCCBAA−611菌株の染色体DNAを鋳型にして連鎖重合法(PCR法)[Sambrook et al, Molecular Cloning, a Laboratory Manual (1989), Cold Spring Harbor Laboratories](PCR条件:変性=94℃、30秒/アニーリング=50℃、30秒/重合反応=72℃、1分30秒、30回)によって1428塩基対のgapN遺伝子を増幅した後、TOPO Cloning Kit(Invitrogen)を用いて大膓菌プラスミドpCR2.1にクローニングしてpCR−gapN2プラスミドを得た。
実施例3で得たgapN遺伝子が含まれたベクターpCR−gapN2をそれぞれ制限酵素NdeIとXbaIに切断してgapNを暗号化する遺伝子断片のみを分離した後、大膓菌とコリネバクテリウムシャトルベクターであるpECCG122(参照;大韓民国特許公開番号1992−0000933に公知される)に発現プロモーターであるPcj7(参照;大韓民国特許公開番号2006−0068505に公知される)を接合してpECCG122−Pcj7−gapN2を製作した(図1)。
バチルス由来のgapN遺伝子の塩基配列は既に明らかになって公開されている。アメリカ国立保健院ジーンバンク(NIH GenBank)からバチルス・セレウス(Bacillus cereus)のgapN遺伝子情報(登録番号NC_004722.1)を確保した。報告された塩基配列に基づいて下記表3で記載された1対のプライマーを合成し、バチルス・セレウスATCC14579菌株の染色体DNAを鋳型にして連鎖重合法(PCR法)[Sambrook et al, Molecular Cloning, a Laboratory Manual (1989), Cold Spring Harbor Laboratories](PCR条件:変性=94℃、30秒/アニーリング=50℃、30秒/重合反応=72℃、1分30秒、30回)によって1428塩基対のgapN遺伝子を増幅した後、TOPO Cloning Kit(Invitrogen)を用いて大膓菌プラスミドpCR2.1にクローニングしてpCR−gapN3プラスミドを得た。
実施例5で得たgapN遺伝子が含まれたベクターpCR−gapN3をそれぞれ制限酵素NdeIとXbaIに切断してgapNを暗号化する遺伝子断片のみを分離した後、大膓菌とコリネバクテリウムシャトルベクターであるpECCG122に発現プロモーターであるPcj7を接合してpECCG122−Pcj7−gapN3を製作した(図1)。
リシン生合成経路の複数個の遺伝子を挿入する菌株は、人工変異法によって製作されたS−(2−アミノエチル)システイン(S−(2−aminoethyl)cysteine、以下、AEC)に対する耐性及びホモセリン漏出(homoserine leaky)の特徴を有するコリネバクテリウム・グルタミクム(KFCC−10881)を用いた。
ブドウ糖10g、(NH4)2SO45g、尿素2g、KH2PO41g、K2HPO42g、MgSO47H2O0.4g、ビオチン200μg、チアミン塩酸塩3000μg、パントテン酸カルシウム1000μg、ニコチンアミド5000μg、NaCl0.5g(蒸溜水1リットル基準)
ブドウ糖20g、ペプトン10g、酵母抽出物10g、尿素5g、KH2PO44g、K2HPO48g、MgSO47H2O0.5g、ビオチン100μg、チアミンHCl1000μg(工程水1リットル基準)
ブドウ糖100g、(NH4)2SO440g、大豆タンパク質(Soy Protein)2.5g、トウモロコシ浸漬固形分(Corn Steep Solids)5g、尿素3g、KH2PO41g、MgSO47H2O0.5g、ビオチン100μg、チアミン塩酸塩1000μg、CaCO330g(蒸溜水1リットル基準)
本実施例では、実施例7で製作されたリシン生産菌株コリネバクテリウム・グルタミクムKFCC10881の染色体DNAを鋳型にしたPCRを介して、リシン生合成経路のgapA遺伝子を確保した。アメリカ国立保健院の遺伝子銀行(NIH GenBank)を基にしてgapA遺伝子の塩基配列情報(NCBI登録番号NC_003450、NCgl1526)を確保し、これに基づいて2対のプライマー(表5、配列番号7〜10)を合成した。
実施例2、4、6で得たpECCG122−Pcj7−gapN1〜3ベクターをCA01−0096に導入した。gapA遺伝子が破壊されると、一般的なコリネバクテリウム・グルタミクムが育つ培地である最小培地では成長できない特徴があることと知られている(参照論文; Hideaki Yukawaら J Mol Microbiol Biotechnol 2004; 8:91−103 )
炭素源を、ブドウ糖を用いて製作した最小培地で成長可否を測定した結果、gapAが破壊された菌株は成長しなかったし、gapNが発現された菌株では成長が回復した。
gapN発現ベクターから細胞内へgapNが発現されて活性があるかどうかをgapN発現量を測定して確認した。gapAが破壊された菌株の中にpECCG122−Pcj7−gapN1、2、3ベクターを導入した菌株CA01−0565、CA01−0566、CA01−0567とgapAが破壊された菌株CA01−0096、gapAが存在する菌株KFCC−10881をそれぞれ種培地で一日ほど培養した後、O.D600=0.2で同一に希釈してO.D600=10から25ml細胞を回収した。A.Soukriら Protein Expression and Purification;25; (2002) 519−529に記載されている方法を用いてgapNの活性を測定した結果、gapN1が1unit、gapN2が0.64unit、gapN3が0.09unitの活性を有していた(表7)。
菌株CA01−0565、CA01−0566、CA01−0567をL−リシン生産能確認のために下記のような方法で培養した。種培地25mlを含有する250mlコーナーバッフルフラスコにコリネバクテリウム・グルタミクムKFCC−10881、CA01−0096、CA01−0565、CA01−0566、CA01−0567を接種し、35℃で20時間振盪培養(220rpm)した。生産培地25mlを含有する250mlコーナーバッフルフラスコに1mlの種培養液を接種し、35℃で96時間振盪培養(220rpm)する。培養終了後、HPLCによってL−リシンの生産量を測定する。コリネバクテリウム・グルタミクムKFCC−10881、CA01−0096、CA01−0565、CA01−0566、CA01−0567に対する培養物中のL−リシンは、下記表8の通りである。その結果、gapAが破壊された菌株では、リシン生産が全然出来なかったし、gapAが破壊された菌株に導入したgapNによってリシンが生産され、その生産量も母菌株であるKFCC−10881に比べて16〜17%上昇した結果を示した(表8)。
特許出願のためのブダペスト国際条約下の微生物受託証明
国際寄託機関によって規則7.1に基づいて発行された原寄託に対する受託証
受信:
シージェイ チェイルジェダン コーポレーション
大韓民国 ソウル チュン−グ ナムデムンロ 5−ガ 500 CJビル
前記翻訳は原文の内容と相違ないことを証明する。
2010年05月28日
弁理士 孫敏
特許出願のためのブダペスト国際条約下の微生物受託証明
国際寄託機関によって規則7.1に基づいて発行された原寄託に対する受託証
受信:
シージェイ チェイルジェダン コーポレーション
大韓民国 ソウル チュン−グ ナムデムンロ 5−ガ 500 CJビル
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
前記翻訳は原文の内容と相違ないことを証明する。
2010年05月28日
弁理士 孫敏
特許出願のためのブダペスト国際条約下の微生物受託証明
国際寄託機関によって規則7.1に基づいて発行された原寄託に対する受託証
受信:
シージェイ チェイルジェダン コーポレーション
大韓民国 ソウル チュン−グ ナムデムンロ 5−ガ 500 CJビル
前記翻訳は原文の内容と相違ないことを証明する。
2010年05月28日
弁理士 孫敏
特許出願のためのブダペスト国際条約下の微生物受託証明
国際寄託機関によって規則7.1に基づいて発行された原寄託に対する受託証
受信:
シージェイ チェイルジェダン コーポレーション
大韓民国 ソウル チュン−グ ナムデムンロ 5−ガ 500 CJビル
前記翻訳は原文の内容と相違ないことを証明する。
2010年05月28日
弁理士 孫敏
Claims (6)
- L−リシン生産能力を有するコリネバクテリウム属(Corynebacterium sp.)菌株であって、内在的グリセルアルデヒド−3−ホスフェートデヒドロゲナーゼをコードする遺伝子(gapA)が不活性化され、外来NADP依存的グリセルアルデヒド−3−ホスフェートデヒドロゲナーゼをコードする遺伝子(gapN)が導入されることによって、親株と比較して向上したL−リシン生産能力を有し、前記外来NADP依存的グリセルアルデヒド−3−ホスフェートデヒドロゲナーゼをコードする遺伝子は、ストレプトコッカス・ミュータンス(Streptococcus mutans:ATCC25175)、ストレプトコッカス・アガラクチア(Streptococcus agalactie:ATCCBAA−611)、またはバチルス・セレウス(Bacillus cereus:ATCC14579)由来であることを特徴とする、コリネバクテリウム属(Corynebacterium sp.)菌株。
- 前記ストレプトコッカス・ミュータンス由来遺伝子、ストレプトコッカス・アガラクチア由来遺伝子及びバチルス・セレウス由来遺伝子は、それぞれ配列番号11、12、及び13のヌクレオチド配列を有するものである請求項1に記載のコリネバクテリウム属菌株。
- 前記内在的グリセルアルデヒド−3−ホスフェートデヒドロゲナーゼをコードする遺伝子は、配列番号14のヌクレオチド配列である請求項1に記載のコリネバクテリウム属菌株。
- 前記コリネバクテリウム属菌株は、コリネバクテリウム・グルタミクムCA01−0565(受託番号KCCM11013P)、コリネバクテリウム・グルタミクムCA01−0566(受託番号KCCM11014P)、またはコリネバクテリウム・グルタミクムCA01−0567(受託番号KCCM11015P)である請求項1に記載のコリネバクテリウム属菌株。
- 前記L−リシン生産能は、NADP依存的グリセルアルデヒド−3−ホスフェートデヒドロゲナーゼの活性化によって増加された還元力で得られることを特徴にする請求項1に記載のコリネバクテリウム属菌株。
- 請求項1〜5のうち、いずれか一項によるコリネバクテリウム属菌株を培養する段階;及び前記培養された細胞または細胞培養物からリシンを回収する段階を含む、L−リシンを生産する方法。
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KR101294935B1 (ko) * | 2011-04-01 | 2013-08-08 | 씨제이제일제당 (주) | 에세리키아 속 균주에서 유래된 프락토키나제 유전자가 도입된 코리네박테리움 속 균주 및 상기 균주를 이용하여 l-아미노산을 생산하는 방법 |
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WO2018213796A1 (en) * | 2017-05-19 | 2018-11-22 | Zymergen Inc. | Genomic engineering of biosynthetic pathways leading to increased nadph |
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