JP2014506477A - 高光学純度の乳酸生産用形質転換体およびそれを利用した乳酸生産方法 - Google Patents
高光学純度の乳酸生産用形質転換体およびそれを利用した乳酸生産方法 Download PDFInfo
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- JP2014506477A JP2014506477A JP2013555345A JP2013555345A JP2014506477A JP 2014506477 A JP2014506477 A JP 2014506477A JP 2013555345 A JP2013555345 A JP 2013555345A JP 2013555345 A JP2013555345 A JP 2013555345A JP 2014506477 A JP2014506477 A JP 2014506477A
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Classifications
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- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/56—Lactic acid
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Abstract
本発明によって、pH条件など生産条件の厳しい制限や微生物内の代謝経路の複雑な調節なしにも簡便に高光学純度の乳酸を高収率で生産することができ、また、付加的な乳酸分離精製工程が不要であるため、乳酸生産段階を顕著に減少させることができて生産費用を大幅に節減することができるだけでなく、沈澱廃棄物による環境的な問題を排除することができて環境保護効果も得ることができる。
Description
一般に乳酸発酵生産は、(1)発酵、(2)細胞菌体および蛋白質除去、(3)乳酸分離および精製、(4)乳酸濃縮、(5)脱色の5段階で構成される。乳酸発酵生産技術は、大部分新規な乳酸生産工程の開発と持続的な改善を通じてプラント(plants)の規模と生産効率向上など生産技術と経済的な蒸発濃縮器(evaporator)とメンブレイン(membrane)技術と共に脱水工程の革新的な進歩のような優れた分離、精製技術開発を通じた分離精製費用節減と効率向上に集中されてきた。
また本発明は、ロイコノストック属菌株由来のD−乳酸デヒドロゲナーゼをコーディングする遺伝子をザイモモナス・モビリス菌株に導入してザイモモナス・モビリス形質転換体を製造する段階と、
前記製造されたザイモモナス・モビリス形質転換体を培養する段階とを含む乳酸生産方法を提供する。
以下、本発明をより詳しく説明する。
したがって、本発明は前記乳酸生産方法によって生産された高光学純度の乳酸を提供する。
前記形質転換体を利用すれば、別途の付加的な乳酸分離精製工程が不要であるため、乳酸生産段階を顕著に減少させることができて生産費用を大幅に節減することができるだけでなく、沈澱廃棄物による環境的な問題を排除することができて環境保護効果も得ることができる。
正方向プライマー(DLmesC2F)(SEQ ID NO:9)
5−TGGAGGATCCCATGGTAAAGATTTTTGC−3
逆方向プライマー(DLmesC2R)(SEQ ID NO:10)
5−TGTTTGATTATTCCTGCAGAAACCCCTC−3
以降、pGEM−T Easy vector(Promega)にクローニングしてDlmesC2遺伝子がクローニングされたプラスミドpGEM−T−DlmesC2を製造し、塩基配列を確認した。PCR増幅とクローニングは製造会社の実験方法に従って行った。
5−GGAAAGTCAAGCTTATCATCTAG−3
上流遺伝子逆方向プライマー(L−270R)(SEQ ID NO:24)
5−GTGAGTTGTTAACCAATTTTATACTCCATTCATC−3
下流遺伝子正方向プライマー(R263F)(SEQ ID NO:25)
5−GACAATACAAAGTACTGATAAAGGA−3
下流遺伝子逆方向プライマー(R263R)(SEQ ID NO:26)
5−ATAAGCCTGTTAACTTAccCATCTTGTCCGACG−3
上記で製造されたpBS−sp−DlmesC2ベクターを制限酵素NotI(NEB)とPstI(NEB)で切断して、specR−DlmesC2遺伝子切片だけを回収し、T4 DNA polymerase(NEB)とT4 polynucleotide kinase酵素(NEB)処理を通じて平滑末端(blunt end)のspecR−DlmesC2遺伝子切片を作製した。作製された平滑末端のspecR−DlmesC2を前記製造されたpBS−del−270::263ベクターの制限酵素HpaIシートにT4 DNA ligase(NEB)酵素でライゲーション(ligation)およびクローニングしてpBS−del−270::sp−DlmesC2::263ベクター(図3)を製造した。
ATCC19254F(SEQ ID NO:27)
5−CATATGAAGATTTTTGCTTACGGCATTCGT−3
ATCC19254R(SEQ ID NO:28)
5−TTAATATTCAACAGCAATAGCT−3
LMG18811F(SEQ ID NO:29)
5−CATATGAAAATTTTTGCTTACGGCATACG−3
LMG18811R(SEQ ID NO:30)
5−CTGCAGTCAGTATTTAACAGCGATTGCA−3
NBRC3426F(SEQ ID NO:31)
5−CATATGAAGATTTTTGCTTACGGCATTCG−3
NBRC3426R(SEQ ID NO:32)
5−CTGCAGTTAATATTCAACAGCAATAGCT−3
5−TGAAATGGCCTCTGCGATATATCGAATA−3
逆方向プライマー(89R)(SEQ ID NO:36)
5−GTAAGGGTATCGCTCCGCTCTTTATGGCGGA−3
5−TAACCCGTTTACCTCTATCATATAATTATA−3
逆方向プライマー(del 87R)(SEQ ID NO:38)
5−CATAAAATTCCTACAAATATGATCTTTTTA−3
5−GAAGAAGCGCAGACCCTATCTCAACGATCTTT−3
逆方向プライマー(384R)(SEQ ID NO:42)
5−CCAAACTGTCCCTTGGCCAGCTTTCAAAAAAAC−3
5−TGTAGTTTATACGCTGCATTAAATGAAAAGG−3
逆方向プライマー(del 381R)(SEQ ID NO:44)
5−TATTTATCCAATGCGCCCCCTGCTTTG−3
5−ATGATCCGATGGCTGGAAATAATGCGGATATG−3
逆方向プライマー(394R)(SEQ ID NO:48)
5−TAGCGGTCTGAGGCTGTGCCTCCGATGTA−3
増幅されたPCR産物は、制限酵素NotI(NEB)で処理した後、同一の制限酵素で切断されたpBluescriptIIベクター(Stratagene)にクローニングし、pBS−ZMO0390394ベクターを作製した。
5−CATCCATTTTGGATATTATTTTTAAATTAATCC−3
逆方向プライマー(del 390R)(SEQ ID NO:50)
5−CGGTAAGTGCCTTTCACCGCTTCCACGACAG−3
増幅されたPCR産物を制限酵素PmeI(NEB)で処理した後、実施例1のsp−DlmesC2遺伝子断片をT4 DNA ligase(NEB)酵素でライゲーション(ligation)してpBS−Del 390::sp−DlmesC2::394ベクターを作製した。
5−ACCAAAGCCGAAAAAAGGTCATCAAAAATACC−3
逆方向プライマー(1789R)(SEQ ID NO:54)
5−GTTCAATTGCCACGCTTGAGGCTTTTGAAAATGC−3
5−TATCTCGCTTGCAATAAAACATATTTTCAGG−3
逆方向プライマー(del 1786R)(SEQ ID NO:56)
5−AGATTTTATCCGACAAAATCAATTCTATAAG−3
増幅されたPCR産物を制限酵素PmeI(NEB)で処理した後、実施例1のsp−DlmesC2遺伝子断片をT4 DNA ligase(NEB)酵素でライゲーション(ligation)してpBS−Del 1786::sp−DlmesC2::1789ベクターを作製した。
5−TGGCAGTCCTCCATCTAGATCGAAGGTGC−3
逆方向プライマー(ldhAR)(SEQ ID NO:60)
5−GTGATCTGACGGTGAGCTCAGCATGCAGG−3
5−AACTAGTTTAAACAAGAGCGAAGAATAGCAAAGAAT−3
逆方向プライマー(ldhA−PmeI−2R)(SEQ ID NO:62)
5−CTCTTGTTTAAACTAGTTATGGCATAGGCTATTACG−3
5−TGTTTCAGGCGGCCGCTATTTTAAGTC−3
逆方向プライマー(Dldh−R)(SEQ ID NO:66)
5−TCTTTATCGCGGCCGCATCAATCACAA−3
5−TTTCTTTTGCAGTTAACTGTCAGCCTGAA−3
逆方向プライマー(Del−DldR)(SEQ ID NO:68)
5−TGATCCTGTATGGTTAACAATTGTTGCC−3
5−ACTCAATGGAACTGCAGCATGATCTGA−3
逆方向プライマー(Adh1−R)(SEQ ID NO:72)
5−ACCAAAGTAACATCTGCAGTGTTGATAATGGー−3
5−TTGCGAATATAGTTTAAACGATTGC−3
逆方向プライマー(Del−Adh1R)(SEQ ID NO:74)
5−ACCAGAAAGGTTTAAACTTTGTCGTC−3
ザイモモナス・モビリスZM4(ATCC 31821)のゲノム遺伝子(AE008692)からアルコールデヒドロゲナーゼII(ZMO1596)遺伝子5’末端側に5’末端から上流相同部位の3、986bp(SEQ ID NO:75)と3’末端側に3’末端から下流相同部位の3,868bp(SEQ ID NO:76)をそれぞれ正方向プライマー(Adh2−F)と逆方向プライマー(Adh2−R)対を用いて実施例1と同様な方法と条件でPCR増幅し、ただし、伸張時間を10分に調節した。
5−CATAACCGACCTGCAGAATAGCCA−3
逆方向プライマー(Adh2−R)(SEQ ID NO:78)
5−TGTACCCACTGCAGAAGAATGATG−3
5−CCTACATACTAGTTTAAACCAACAAC−3
逆方向プライマー(Del−Adh2R)(SEQ ID NO:80)
5−CTGTCTTGATGTTTAAACAAACAATGC−3
前記実施例4−3により製造されたpBS−Del ZM01236::sp−DlmesC2ベクターをザイモモナス・モビリスZM4菌株に形質転換し、前記抗生剤スペクチノマイシンが含まれているRM培地に選択的生長を示す形質転換体らを選別する過程を通じてアルコールデヒドロゲナーゼI(ZMO1236)遺伝子がsp−DlmesC2遺伝子で置換されたZ.mobilis ΔZMO1236::sp−DlmesC2菌株(MG6113菌株)を製造した。
対照群としては野生型ザイモモナス・モビリス菌株ZM4(ATCC 31821)を用い、前記野生型ZM4菌株とD−乳酸デヒドロゲナーゼ遺伝子が導入されたZM菌株(MG6106、MG6115、MG6116、MG6117およびMG6118)のそれぞれをRM培地(グルコース、20g/l;酵母抽出物(DIFCO)、10g/l;MgSO4、1g/l;(NH4)2SO4、1g/l;KH2PO4、2g/l;pH5.0)で対数増殖期までインキュベータ(incubator)で定置培養して生長させた後、各細胞を回収した(12,000rpm、5min、4℃)。回収された各細胞らを高周波破砕(sonication)方法で破砕した後、遠心分離(15,000rpm、10min、4℃)して上澄液(supernatant)を回収して酵素活性測定に用いた。
D−乳酸デヒドロゲナーゼ酵素活性は2種類のキット(Lactic acid assay kit)(Megazyme、Sigma)を利用して製造会社の方法に従って測定し、その結果を下記表1に示した。
実験例2−1.乳酸(D−lactic acid/D−lactate)生産能力試験方法
HPLCシステム:Hitachi HPLCシステム(model D−7000)
カラム:Aminex HPX−87H(300mmX7.8mm)
カラム温度:60℃
流速:0.6ml/min
移動床(溶媒):0.0025N sulfuric acid
検出器:
D−lactic acid/D−lactateおよびその他有機酸−UV検出器(Hitachi D−4200)(215nm)
糖およびエタノール−RI(refractive index)検出器(D−3300)
HPLCシステム:Hitachi HPLCシステム(model D−7000)
カラム:Chirex 3126カラム(Phenomenex)(250mmX4.6mm)
カラム温度:25℃
流速:1.5ml/min
移動床(溶媒):1mM copper sulfate(CuSO4)溶液
検出器:UV検出器(Hitachi D−4200)(254nm)
具体的に標準試薬D(−)−lactic acid(L0625、Sigma)、L(+)−lactic acid(L1750、Sigma)、そしてDL−lactic acid(L1250、Sigma)を用いてD−lactic acidとL−lactic acidの光学異性体を区分、分離し、光学純度(%)と光学超過数値(%)はそれぞれ以下の数式1および2により計算した。
D−lactic acidの光学純度(%)=D/D+L*100
[数式2]
ee value(%)=D+L/D−L*100
Claims (10)
- ロイコノストック(Leuconostoc)属菌株由来のD−乳酸デヒドロゲナーゼをコーディングする遺伝子が導入されたザイモモナス・モビリス(Zymomonas mobilis)形質転換体。
- 前記D−乳酸デヒドロゲナーゼをコーディングする遺伝子は、SEQ ID NO:2、SEQ ID NO:4、SEQ ID NO:6、またはSEQ ID NO:8のアミノ酸配列で表されるペプチドをコーディングする遺伝子である、請求項1に記載の形質転換体。
- 前記D−乳酸デヒドロゲナーゼをコーディングする遺伝子は、SEQ ID NO:1、SEQ ID NO:3、SEQ ID NO:5、またはSEQ ID NO:7の塩基配列で表される、請求項1に記載の形質転換体。
- 前記形質転換体は、寄託番号KCTC 11803BPである、請求項1に記載の形質転換体。
- ザイモモナス・モビリス菌株を準備する段階と、
前記ザイモモナス・モビリス菌株にロイコノストック属菌株由来のD−乳酸デヒドロゲナーゼをコーディングする遺伝子を導入する段階とを含む
ザイモモナス・モビリス形質転換体製造方法。 - 前記導入は、接合、電気穿孔法、および遺伝子銃方法からなる群より選ばれた方法で行う、請求項5に記載の方法。
- ロイコノストック属菌株由来のD−乳酸デヒドロゲナーゼをコーディングする遺伝子をザイモモナス・モビリス菌株に導入してザイモモナス・モビリス形質転換体を製造する段階と、
前記製造されたザイモモナス・モビリス形質転換体を培養する段階とを含む
乳酸生産方法。 - 前記培養は、pH3.0乃至pH7.0の条件下で行う、請求項7に記載の方法。
- 請求項7または8の方法によって生産された光学純度が95%以上である乳酸。
- 光学純度が99%以上である、請求項9に記載の乳酸。
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US9428775B2 (en) | 2016-08-30 |
EP2679668B1 (en) | 2015-09-23 |
US20140128635A1 (en) | 2014-05-08 |
EP2679668A4 (en) | 2014-10-29 |
EP2679668A1 (en) | 2014-01-01 |
JP5797280B2 (ja) | 2015-10-21 |
WO2012115290A1 (ko) | 2012-08-30 |
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