JP2015505671A - L−アミノ酸及びリボフラビンを同時に生産する微生物及びそれを用いたl−アミノ酸及びリボフラビンの生産方法 - Google Patents
L−アミノ酸及びリボフラビンを同時に生産する微生物及びそれを用いたl−アミノ酸及びリボフラビンの生産方法 Download PDFInfo
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- JP2015505671A JP2015505671A JP2014544651A JP2014544651A JP2015505671A JP 2015505671 A JP2015505671 A JP 2015505671A JP 2014544651 A JP2014544651 A JP 2014544651A JP 2014544651 A JP2014544651 A JP 2014544651A JP 2015505671 A JP2015505671 A JP 2015505671A
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- Prior art keywords
- riboflavin
- lysine
- threonine
- microorganism
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
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Abstract
Description
本実施例では、コリネバクテリウム・グルタミクムにおいてL-アミノ酸の生産時に必要なNADPH(コチンアミドアデニンジヌクレオチドリン酸)の主な供給経路であるペントースリン酸化経路上の炭素の流れを増加させるために高濃度グルコン酸に対する適応性を付与する実験を行った。
グルコン酸20g、(NH4)2SO4 50g、ペプトン10g、酵母抽出物5g、尿素1.5g、KH2PO4 5g、K2HPO410g、MgSO4・7H2O 0.5g、ビオチン100μg、チアミン塩酸塩100μg、カルシウム-パントテン酸2000μg、ニコチンアミド2000μg、寒天20g(蒸溜水1リットル基準)
実施例2:KFCC10881-YCのリシン生産能分析及び発色原因の究明
前記実施例1で製造したKFCC10881-YC菌株の特性を調べるために下記のような方法で培養することによってリシン生産能を比較し、培養液成分を分析した。
ブドウ糖20g、ペプトン10g、酵母抽出物5g、尿素1.5g、KH2PO4 4g、K2HPO48g、MgSO4 7H2O 0.5g、ビオチン100μg、チアミンHCl1000μg、カルシウム-パントテン酸2000μg、ニコチンアミド2000μg (蒸溜水1リットル基準)
<生産培地(pH 7.0)>
ブドウ糖100g、(NH4)2SO440g、大豆タンパク質2.5g、トウモロコシ浸漬固形分(Corn Steep Solids)5g、尿素3g、KH2PO41g、MgSO4・7H2O 0.5g、ビオチン100μg、チアミン塩酸塩1000μg、カルシウム-パントテン酸2000μg、ニコチンアミド3000μg、CaCO3 30g(蒸溜水1リットル基準)。
前記実施例1で製造したKFCC10881-YCの色相変化及びリボフラビン生産能の増加を誘発した根本的な遺伝子レベルでの塩基配列突然変異を探索するためにコリネバクテリウム・グルタミクム中のKFCC10881-YCのリボフラビン生合成に関連した染色体部位の塩基配列を決定し、アメリカ国立衛生研究所の遺伝子銀行(NIH genBank)を根拠として確認した。
配列番号8:5'-tttgtcgacattccgctaaaacacgt-3'
PCRで増幅された遺伝子断片を制限酵素EcoRIとSalIで処理してそれぞれのDNA切片を得た後、これを制限酵素EcoRI及びSalI末端を有する染色体導入用pDZベクター(特許文献26)に連結した後、大腸菌DH5αに形質転換し、カナマイシン(25 mg/l)が含まれたLB固体培地に塗抹した。PCRを通じて目的とした遺伝子が挿入されたベクターに形質転換されたコロニーを選別した後、公知のプラスミド抽出法を用いてプラスミドを獲得し、このプラスミドをpDZ-Pmrbと命名した(図3)。
前記実施例3で製造したベクターpDZ-Pmrbを相同染色体組換えによりL-リシン生産菌株であるコリネバクテリウム・グルタミクム KFCC10881に形質転換させた。その後、染色体上のribオペロンプロモーター変異が導入された菌株をコロニー色相変化により選択的に分離して実施例2と同様の方法で培養し、これから回収されたL-リシン及びリボフラビンの濃度を分析した(表2)。前記ribオペロンプロモーター変異が導入された菌株をコリネバクテリウム・グルタミクム CA01-2162, KFCC10881::Pmrbと命名した。前記突然変異菌株は、簡単に通称KFCC10881::Pmrbとも称され、これを2011年11月11日に韓国微生物保存センター(大韓民国ソウル西大門区弘濟1洞ユリムビル)に寄託番号KCCM11221Pとして寄託した。
rpe遺伝子を除いたリボフラビン生合成遺伝子群のみを過発現させるために、コリネバクテリウム由来の強力なプロモーターをrib生合成遺伝子群の最前方に位置したribG遺伝子(配列番号4)の開始コドン上端に連結することによりリボフラビン生合成遺伝子群の発現量の増加を誘導するための組換えベクターを製作した。
配列番号10:5'-tttctagattactgcgcgagtgctc-3'
配列番号11:5'-ttttctagataacatatggatgttgcgcacgcg-3'
配列番号12:5'-tttgtcgacattggcgtaaaacacgt-3'
コリネバクテリウム・グルタミクム由来のlysCP1プロモーター(配列番号6)を増幅でき、5'末端にXbaI制限酵素部位を挿入したプライマーと3'末端にNdeI制限酵素部位を有するように考案したプライマー(配列番号13及び14)を合成し、コリネバクテリウム・グルタミクム菌株の染色体DNAを鋳型にしたPCRを通じて約400 bpのプロモーター部位を増幅した。PCR条件は94℃で5分間変性した後、94℃で30秒間変性、58℃で30秒間アニーリング、72℃で30秒間重合を30回繰り返した後、72℃で7分間重合反応を行った。前記PCR増幅産物をXbaIとNdeIで処理した後、pDZ-ribGベクターを制限酵素XbaIとNdeIで処理して得たDNA切片と連結してpDZ-lysCP1_ribGベクターを製作した(図4)。本PCRに用いたプライマー配列を下記に示した。
配列番号14:5'-tttcatatgctttgtgcacctttcg-3'
実施例6:ribG上流に強力なプロモーター(LysCP1)が導入された菌株のリシン及びリボフラビン生産能の比較
前記実施例5で製造したベクターpDZ-lysCP1_ribGを電気パルス法を用いてL-リシン生産菌株であるコリネバクテリウム・グルタミクム KFCC10881に形質転換させ、染色体上のribG遺伝子固有プロモーターがlysCP1で置換された菌株を選択的に分離することにより、L-リシン及びリボフラビンを同時に生産するKFCC10881::lysCP1_ribGを得た。この菌株を実施例2と同様の方法で培養し、培養液中のL-リシン及びリボフラビンの濃度を分析した(表3)。前記KFCC10881::lysCP1_ribG菌株をコリネバクテリウム・グルタミクム CA01-2161、KFCC10881::lysCP1_ribGと命名した。前記突然変異菌株は簡単に通称KFCC10881::lysCP1_ribGとも称され、これを2011年11月11日に韓国微生物保存センター(大韓民国ソウル西大門区弘濟1洞ユリムビル)に寄託番号KCCM11220Pとして寄託した。
KFCC10881菌株にribオペロンを含んでいるプラスミドを導入してリボフラビン生合成遺伝子のコピー数を増加させてリボフラビン生産能を確認することにした。
配列番号16:5'-TTTGGTACCCGCGATCTTTTTCAGAAACT-3'
PCRで増幅された遺伝子断片を制限酵素XbaIで処理してDNA切片を得た後、これを制限酵素XbaI末端を有するpECCG117ベクターに連結した後、大腸菌DH5αに形質転換し、カナマイシン(25mg/l)が含まれたLB固体培地に塗抹した。PCRを通じて目的とした遺伝子が挿入されたベクターに形質転換されたコロニーを選別した後、通常、知られているプラスミド抽出法を用いてプラスミドを獲得し、このプラスミドをpECCG117-ribと命名した。
本実施例では、コリネバクテリウム・グルタミクムのL-スレオニン生産能を増加させるためにL-スレオニン類似物質であるAHV(2-アミノ-3-ヒドロキシ-バレラート)に対する耐性を付与する実験を行った。KFCC10881を母菌株としてN-メチル-N-ニトロ-N-ニトログアニジン(NTG)による人工突然変異を誘導した後、AHVを1〜10g/lの濃度で含有した下記最小培地で培養しながら培地内のAHV濃度によるコロニー形成の有無をNTG非処理対照区と比較した。NTG非処理対照区の場合、培養72時間目を基準に1〜3g/lのAHVに対する耐性を示したが、NTG処理区では、同一時間培養した時、AHV 6g/lの濃度までにおいてコロニーが形成された。これらのL-スレオニン生産能増加の有無を確認するために、下記のような方法で培養し、培養液中のL-スレオニンの生産量を分析した。
ブドウ糖5g、KH2PO4 1g、(NH4)2SO4 5g、MgSO4 7H2O 0.4g、NaCl 0.5gビオチン200μg、チアミンHCl 100μg、カルシウム-パントテン酸100μg、ニコチンアミド0.03g、L-スレオニン0.01g、尿素2g、Na2B4O710H2O 0.09 mg、(NH4)6Mo7O274H2O 0.04 mg、ZnSO47H2O 0.01 mg、CuSO45H2O、MnCl24H2O 0.01 mg、FeCl36H2O 1 mg、CaCl2 0.01 mg(蒸溜水1リットル基準)
<種培地(pH 7.0)>
ブドウ糖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、カルシウム-パントテン酸2000μg、ニコチンアミド2000μg(蒸溜水1リットル基準)
<生産培地(pH 7.0)>
ブドウ糖100g、(NH4)2SO420g、大豆タンパク質2.5g、トウモロコシ浸漬固形分5g、尿素3g、KH2PO4 1g、MgSO47H2O 0.5g、ビオチン100μg、チアミン塩酸塩1000μg、カルシウム-パントテン酸2000μg、ニコチンアミド3000μg、CaCO330g(蒸溜水1リットル基準)
培養を終了した後、HPLCを用いて培養液中のL-スレオニンの濃度を分析し、最も高いL-スレオニン生産能を示した変異株をコリネバクテリウム・グルタミクム CA01-2182、KFCC10881-THRと命名した。前記突然変異菌株は、簡単に通称KFCC10881-THRとも称され、これを2011年11月11日に韓国微生物保存センター(大韓民国ソウル西大門区弘濟1洞ユリムビル)に寄託番号KCCM11222Pとして寄託した。KFCC10881-THRのL-スレオニン生産能は下記の通りだ(表5)。
前記実施例3で製造したベクターpDZ-Pmrbと実施例5で製造したpDZ-lysCP1_ribGを電気パルス法を用いて前記実施例8で製造したL-スレオニン生産菌株であるKFCC10881-THRにそれぞれ形質転換させ、染色体上のrpe遺伝子固有プロモーターがPmrbで置換された菌株またはribG遺伝子固有プロモーターがlysCP1で置換された菌株を選択的に分離して実施例7と同様の方法で培養し、これから回収されたL-スレオニン及びリボフラビンの濃度を分析した(表6)。
Claims (21)
- L-リシンまたはL-スレオニン生産能を有するコリネバクテリウム属の微生物において、前記L-リシンまたはL-スレオニンの生産は高濃度に維持され、リボフラビンの生産量が増加するように改変された前記微生物を培養してL-リシンまたはL-スレオニン、及びリボフラビンを発酵法で同時に生産する工程を含む、L-リシンまたはL-スレオニン、及びリボフラビンの同時生産方法。
- 前記コリネバクテリウム属の微生物が、コリネバクテリウム・グルタミクム(Corynebacteriumglutamicum)、コリネバクテリウム・アンモニアゲネス(Corynebacterium ammoniagenes)、コリネバクテリウム・サーモアミノゲネス(Corynebacterium thermoaminogenes)、ブレビバクテリウム・フラバム(Brevibacterium flavum)及びブレビバクテリウム・ラクトフェルメンタム(Brevibacterium fermentum)からなる群から選択される、請求項1に記載の方法。
- 前記コリネバクテリウム属の微生物が、コリネバクテリウム・グルタミクムである、請求項2に記載の方法。
- 前記L-リシンまたはL-スレオニン:リボフラビンの比率が、1:0.0001〜0.1である、請求項1に記載の方法。
- 前記L-リシンまたはL-スレオニン、及びリボフラビンを含む培養発酵液を顆粒化する工程を含む、請求項1に記載の方法。
- 前記L-リシンまたはL-スレオニン、及びリボフラビンを含む培養発酵液から菌体スラッジを除去する工程を含む、請求項1に記載の方法。
- 高濃度L-リシン生産能を有するコリネバクテリウム・グルタミクムに無作為突然変異を誘導することにより、前記L-リシン生産は高濃度に維持され、リボフラビンの生産量が増加するように改変された寄託番号KCCM11223Pの変異型コリネバクテリウム・グルタミクム微生物。
- L-リシンまたはL-スレオニン生産能を有するコリネバクテリウム属の微生物において、リボフラビン生合成遺伝子群を含むribオペロンにより発現する酵素群の活性を強化させることにより、前記L-リシンまたはL-スレオニンの生産は高濃度に維持され、同時にリボフラビンの生産量が増加するように改変された、L-リシンまたはL-スレオニン、及びリボフラビンを同時に生産する変異型コリネバクテリウム属の微生物。
- 前記コリネバクテリウム属の微生物が、コリネバクテリウム・グルタミクム、コリネバクテリウム・アンモニアゲネス、コリネバクテリウム・サーモアミノゲネス、ブレビバクテリウム・フラバム及びブレビバクテリウム・ラクトフェルメンタムからなる群から選択される、請求項8に記載の微生物。
- リボフラビン生合成遺伝子群により発現する酵素群の活性を強化させる、請求項8に記載の微生物。
- 前記酵素群の活性強化が、前記酵素群をコードする遺伝子の細胞内コピー数の増加、前記酵素群をコードする染色体上の遺伝子の調節配列に変異を導入する方法、前記酵素群をコードする染色体上の遺伝子の調節配列を、強力な活性を有する配列に置き換える方法、前記酵素群の活性が増加するように突然変異された遺伝子で染色体上の前記酵素群をコードする遺伝子を代替する方法、及び前記酵素群の活性が強化されるように前記酵素群をコードする染色体上の遺伝子に変異を導入させる方法からなる群から選択されるいずれか1つ以上の方法である、請求項10に記載の微生物。
- 前記酵素群をコードする染色体上の遺伝子の調節配列を、強力な活性を有するプロモーターに置き換える方法である、請求項11に記載の微生物。
- 前記プロモーターが、配列番号5または配列番号6で記載されたプロモーターである、請求項12に記載の微生物。
- L-リシン生産能を有するコリネバクテリウム属の微生物において、リボフラビン生合成遺伝子群を含むribオペロンにより発現する酵素群の活性を強化させることにより、前記L-リシン生産は高濃度に維持され、同時にリボフラビンの生産量が増加するように改変された、L-リシン及びリボフラビンを同時に生産する寄託番号KCCM11220P、KCCM11221PまたはKCCM11223Pである請求項8に記載の微生物。
- 前記L-スレオニン生産能を有するコリネバクテリウム属の微生物が、寄託番号KCCM11222Pである、請求項8に記載の微生物。
- a) L-リシンまたはL-スレオニン生産能を有するコリネバクテリウム属の微生物において、前記L-リシンまたはL-スレオニンの生産は、高濃度に維持され、リボフラビンの生産量が増加するように改変された前記微生物を培養してL-リシンまたはL-スレオニン、及びリボフラビンを発酵法で同時に生産する工程;及びb) 前記工程a)のL-リシンまたはL-スレオニン、及びリボフラビンを含む発酵液を顆粒化する工程を行って製造された顆粒製剤。
- 前記L-リシンまたはL-スレオニン:リボフラビンの比率が、1:0.0001〜0.01である、請求項16に記載の顆粒製剤。
- 前記工程a)で生産されたL-リシンまたはL-スレオニン、及びリボフラビンを含む発酵培養液から菌体スラッジを除去する工程を含む、請求項16または17に記載の顆粒製剤。
- a)L-リシンまたはL-スレオニン生産能を有するコリネバクテリウム属の微生物において、前記L-リシンまたはL-スレオニンの生産は高濃度に維持され、リボフラビンの生産量が増加するように改変された前記微生物を培養してL-リシンまたはL-スレオニン、及びリボフラビンを発酵法で同時に生産する工程;及びb) 工程a)のL-リシンまたはL-スレオニン、及びリボフラビンを含む発酵液から菌体スラッジを除去する工程を行って製造されたL-リシンまたはL-スレオニン、及びリボフラビン含有製剤。
- 前記L-リシンまたはL-スレオニン:リボフラビンの比率が1:0.0001〜0.01である、請求項19に記載のL-リシンまたはL-スレオニン、及びリボフラビン含有製剤。
- 請求項16または18に記載の顆粒製剤または請求項19に記載のL-リシンまたはL-スレオニン、及びリボフラビン含有製剤を含む飼料添加剤。
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US20140356518A1 (en) | 2014-12-04 |
BR112014013239A2 (pt) | 2017-06-13 |
WO2013081296A1 (ko) | 2013-06-06 |
KR20130061570A (ko) | 2013-06-11 |
CN103224964B (zh) | 2017-06-13 |
CN105713947B (zh) | 2020-06-09 |
RU2588657C2 (ru) | 2016-07-10 |
KR101335853B1 (ko) | 2013-12-02 |
RU2014123540A (ru) | 2016-01-27 |
MY166528A (en) | 2018-07-10 |
MX2014006502A (es) | 2015-08-10 |
EP2787082A1 (en) | 2014-10-08 |
JP5966016B2 (ja) | 2016-08-10 |
BR112014013239B1 (pt) | 2022-04-12 |
MX355904B (es) | 2018-05-03 |
EP2787082A4 (en) | 2015-07-08 |
US10590446B2 (en) | 2020-03-17 |
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