JP5805768B2 - スクロースとグリセロールとを同時に利用する新規コハク酸生成変異微生物及びこれを利用したコハク酸製造方法 - Google Patents
スクロースとグリセロールとを同時に利用する新規コハク酸生成変異微生物及びこれを利用したコハク酸製造方法 Download PDFInfo
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- JP5805768B2 JP5805768B2 JP2013527009A JP2013527009A JP5805768B2 JP 5805768 B2 JP5805768 B2 JP 5805768B2 JP 2013527009 A JP2013527009 A JP 2013527009A JP 2013527009 A JP2013527009 A JP 2013527009A JP 5805768 B2 JP5805768 B2 JP 5805768B2
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- succinic acid
- glycerol
- sucrose
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Description
異化代謝産物抑制機構のメカニズムを詳しく調べると、大きく転写レベルの阻害とアロステリック阻害の二つに分けられる(Deutscher et al., Microbiol. Mol. Biol. Rev., 70:939, 2006; Gorke et al., Nature reviews, 6:613, 2008; Pettigrew et al., J. Bacteriol., 178:2846, 1996; Zwaig et al., J. Bacteriol., 102:753, 1970)。先に転写レベルでは、GlpRレギュレーターの作用でグリセロールを細胞内に輸送し、利用するのに用いられる遺伝子の転写(transcription)が阻害される。アロステリック阻害とは、グリセロール代謝で核心的な機能を担うグリセロールキナーゼにフルクトース1,6−ビスホスフェート(FBP)やEIIA等が結合して、その活性を落とすことをいう。スクロースとグリセロールとが同時にある環境では、GlpRレギュレーターによる転写レベルの阻害と、FBPとEIIAによるアロステリック阻害が、同時に起きて、グリセロール代謝が全般的に阻害される。従って、このような異化代謝産物抑制機構を弱化できる戦略は、GlpRによる転写レベルの阻害を弱化し、FBPやEIIAによるアロステリック阻害を受けないようにすることである。
コハク酸生成微生物のゲノムからfruA遺伝子(プルクトースホスホトランスフェラーゼをコードする遺伝子)を相同組換え方法で除去するために、遺伝子交換ベクターを次のように作製した。先にM.サクシニシプロデュセンスMBEL55E(KCTC0769BP)のゲノムDNAを鋳型として、配列番号1と2、配列番号3と4、配列番号5と6のプライマーを用いてfruA左側相同性部位(HL)、クロラムフェニコール(Cm)を抵抗性遺伝子として含むPCR切片、及びfruA右側相同性部位(HR)各々のPCR切片を取得した。その後、配列番号1と6のプライマーを用いて前記三つのPCR切片を鋳型として、オーバーラッピングPCRを行って、このように得られたDNAの切片をSacIとPstIで切断し、これをpSacHR06ベクターに導入して、pSacHR06fruAベクターを完成した。
配列番号1:5'-ATCGCGGATCCGGTGGAAACCCTCGGTTTATT
配列番号2:5'-AATCTGCTCTGATGCGCAGCTAAAACCTGGTGCAATA
配列番号3:5'-CCAGGTTTTAGCTGCGCATCAGAGCAGATTGTACTGAGAG
配列番号4:5'-AATTACACTTGAAACCCTGATTCTGTGGATAACCGTATTAC
配列番号5:5'-ATCCACAGAATCAGGGTTTCAAGTGTAATTGGCGGAG
配列番号6:5'-TCGACGCGTCGACTTCATCTAACCCCAACGCTTG
実施例1で作製されたfruA遺伝子除去用ベクターpSacHR06fruAを利用して、M.サクシニシプロデュセンスPALK(KCTC10973BP)のゲノムにおいてfruAを欠失させて変異菌株を作製した。
配列番号7:5'-CTATGATTTGGTCGGGCGTTT
配列番号8:5'-TGAATGGCAGAAATTCGAAA
配列番号9:5'-TGATCTTCCGTCACAGGTAT
配列番号10:5''TTGACCGCACTTTGCACATC
大腸菌由来グリセロールキナーゼをコードする遺伝子(glpK22)を含むDNAを取得するために大腸菌K−12 MG1655(ATCC 47076; American Type Culture Collection, Manassas, VA, USA)のゲノムDNAを鋳型として、配列番号11と12、配列番号13と14、配列番号15と16のプライマーを用いて各々PCRを行った。このように得られた三つのPCR産物を鋳型として再度PCRを行うことで、一つのPCR産物を取得し、このPCR産物にはコード配列の913番目の塩基対が本来大腸菌K−12 MG1655のglpK遺伝子が持っていたグアニンがアデノシンに転化されているglpK22遺伝子が含まれているが、本遺伝子から発現するグリセロールキナーゼ(glycerol kinase)は変異前のglpKに比べてFBPとIIAによるアロステリック阻害を相対的に少なく受けることが知られている(Pettigrew et al., J. Bacteriol., 178:2846, 1996)。
配列番号11:5'-ACTCCGGAATTCAACGCACTGACAATCTCACTT
配列番号12:5'-CAGCGAAGCTTTTTGGGTAGAAAGTATAAAGACAGAATCACA
配列番号13:5'-TTTATACTTTCTACCCAAAAAGCTTCGCTGTAATATG
配列番号14:5'-CCATAAACACCGCACTTTCCAACGCATAGTTCACTTC
配列番号15:5'-AACTATGCGTTGGAAAGTGCGGTGTTTATGGCAGG
配列番号16:5'-ACCTGCGAGCTCATTATTGATGTGTGCGGGGT
配列番号17:5'-TAGCTATGTGTTAAAGCCTT
配列番号18:5'-ACCAGGGCACCACCAGCTCC
配列番号19:5'-CCGATTACACCAACGCCTCT
配列番号20:5'-ATGTGGTTCCGGCATTTACC
配列番号21:5'-TTATGCCGCATCCGGTAGTCCC
前記実施例2及び3で作製されたM.サクシニシプロデュセンスPALFK(KCTC11694BP)、またはPALKG(KCTC11693BP)菌株を10g/Lスクロースを含んだ10mLのMH5培地(リットル当り、2.5g酵母エキス(yeast extract)、2.5gポリペプトン(polypeptone)、1gのNaCl、0.02gのCaCl2・2H2O、0.2gのMgCl2・6H2O、8.7gのK2HPO4、及び10.0gのNaHCO3)に播種して嫌気条件下39℃で8時間培養した後、これをまた同じ培地300mLに移して培養した。発酵は、前記培養液を2.5Lの合成培地(リットル当り、1gのNaCl、2gの(NH4)2HPO4、0.02gのCaCl2・2H2O、0.2gのMgCl2・6H2O、8.709gのK2HPO4、0.5gシステイン(cysteine)、0.5gメチオニン(methionine)、0.5gアラニン(alanine)、0.5gアスパラギン(asparagine)、0.5gアスパラギン酸(aspartic acid)、2.46gプロリン(proline)、0.5gセリン(serine)、0.005gニコチン酸(nicotinic acid)、0.005gCa−パントセネート(Ca-pantothenate)、0.005gピリドキシンHCl(pyridoxine・HCl)、0.005gチアミン(thiamine)、0.005gアスコルビン酸(ascorbic acid)及び0.005gビオチン(biotin))を含有した微バイオリアクター(Bioflo 3000, New Brunswick Scientific Co., Edison, NJ, USA)に播種して行い、発酵条件は、22.25g/L(65mM)初期スクロース濃度、4.6g/L(50mM)初期グリセロール濃度で、温度39℃ 200rpm条件で0.2vvm(二酸化炭素体積/培養器内稼動体積(working volume)/分)速度で純粋二酸化炭素を供給しながら発酵させた。発酵中pHはアンモニア水を用いて6.5に調整し、抗生剤は、PALKの場合、スペクチノマイシン50μg/mL、PALFKの場合、クロラムフェニコール6.8μg/mL、PALKGの場合、アンピシリン25μg/mLを各々添加した。高濃度のコハク酸産生のために、炭素源が完全に消耗した場合には、必要時700g/Lのスクロース及びグリセロール溶液を半連続的に添加した。前記と同様の方法でコハク酸産生用変異菌株であるM.サクシニシプロデュセンスPALK(KCTC10973BP)をPALFK菌株の性能と比較のために培養した。培養液内の細胞濃度は、分光光度計を利用して測定し、予め測定した分光光度計の吸光度と乾燥細胞の重量検証線を利用して細胞濃度を計算した。発酵過程中バイオリアクターから周期的にサンプルを採取し、採取された試料は13,000rpmで10分間遠心分離した後、上澄液の各種代謝産物及びコハク酸濃度、スクロース及びグリセロール濃度を液体クロマトグラフィー(HPLC)で分析した。
本実施例では高収率単一コハク酸産生菌株であるM.サクシニシプロデュセンスPALFKの生産性向上方法を確認した。
受託番号:KCTC11693BP
受託日時:20100510
受託機関名:韓国生命工学研究院
受託番号:KCTC11694BP
受託日時:20100510
Claims (7)
- コハク酸生成微生物から、フルクトースホスホトランスフェラーゼをコードする遺伝子を欠失させて、スクロースによるグリセロールの異化代謝産物抑制機構を弱化させることによって得られる、コハク酸産生にスクロースとグリセロールとを同時に利用可能な変異微生物を嫌気的条件で培養し、グリセロールとスクロースとを同時に摂取してコハク酸を生産する段階及び前記培養液からコハク酸を回収する段階を含むコハク酸の製造方法。
- 副産物として、他の有機酸の生成量は、コハク酸生成重量の1%以下であることを特徴とする請求項1に記載のコハク酸の製造方法。
- 前記コハク酸生成微生物は、ルーメンバクテリアであることを特徴とする請求項1又は2に記載の方法。
- 前記ルーメンバクテリアは、マンヘミア属(Mannheimia sp.)、アクチノバチルス属(Actinobacillus sp.)及びアネロビオスピリルム(Anaerobiospirillum sp.)からなる群から選択されることを特徴とする請求項3に記載の方法。
- 前記マンヘミア属菌株は、マンヘミア・サクシニシプロデュセンスPALK(KCTC10973BP)であることを特徴とする請求項4に記載の方法。
- 前記変異微生物は、マンヘミア・サクシニシプロデュセンスPALFK(KCTC11694BP)であることを特徴とする請求項1に記載の方法。
- 下記段階を含むコハク酸の製造方法:
(a)コハク酸生成微生物から、フルクトースホスホトランスフェラーゼをコードする遺伝子を欠失させて、スクロースによるグリセロールの異化代謝産物抑制機構を弱化させることによって得られる、コハク酸産生にスクロースとグリセロールとを同時に利用可能な変異微生物を嫌気的条件で培養し、グリセロールとスクロースとを同時に摂取してコハク酸を生産する段階;
(b)前記培養液内の細胞濃度を高濃度に濃縮させる段階;
(c)前記高濃度の細胞を培養する段階;及び
(d)前記培養液からコハク酸を回収する段階。
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CN105154381A (zh) | 2015-12-16 |
EP2612905B1 (en) | 2016-10-05 |
US20130217087A1 (en) | 2013-08-22 |
CA2809942A1 (en) | 2012-03-08 |
KR101221557B1 (ko) | 2013-01-14 |
BR112013004652B1 (pt) | 2021-05-18 |
EP2612905A4 (en) | 2014-12-17 |
RU2013109055A (ru) | 2014-09-10 |
WO2012030130A3 (ko) | 2012-06-28 |
CN103249832B (zh) | 2016-09-21 |
EP2993225A3 (en) | 2016-04-20 |
RU2537003C2 (ru) | 2014-12-27 |
BR112013004652A2 (pt) | 2016-07-05 |
EP2612905A2 (en) | 2013-07-10 |
ES2602780T3 (es) | 2017-02-22 |
CN103249832A (zh) | 2013-08-14 |
JP2013539368A (ja) | 2013-10-24 |
DK2612905T3 (en) | 2016-12-12 |
CA2809942C (en) | 2016-04-12 |
KR20120020614A (ko) | 2012-03-08 |
EP2993225A2 (en) | 2016-03-09 |
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WO2012030130A2 (ko) | 2012-03-08 |
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