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产L-乳酸的运动发酵单胞菌代谢工程菌株的构建

作  者:
姜坤妤;苏喆;王勇;潘超强;朱燕;郑秀;高强
单  位:
中法合营王朝葡萄酿酒有限公司;天津市药品检验所;天津科技大学生物工程学院;天津科技大学后勤服务集团
关键词:
运动发酵单胞菌;同源重组;L-乳酸;乳酸脱氢酶;丙酮酸脱氢酶
摘  要:
以运动发酵单胞菌(Zymomonas mobilis)CP4基因组DNA为模板,采用PCR技术克隆得到其丙酮酸脱氢酶基因(pdc)同源下游p3片段,并连接到广谱宿主载体pBBR1MCS3-Ppdc-ldhL中构建了重组质粒pBBR1MCS3-Ppdc-ldhL-p3,将此重组质粒转化到受体菌Z mobilis CP4中,分别以Ppdc和p3片段作为同源上游和下游片段,利用同源双交换重组技术将重组质粒中的ldhL基因置换了Z.mobilis染色体中的pdc基因,得到重组菌株Z.mobilis CP4(△pdc::ldhL)。测得重组菌株乳酸产量为10.8g/L,明显高于出发菌株,说明初步成功构建了产L-乳酸的运动发酵单胞菌代谢工程菌株。
译  名:
Construction of Metabolically-engineered Zymomonas mobilis Strain for L-lactic Acid Production
作  者:
Jiang Kunyu~1 Su Zhe~2 Wang Yong~3 Pan Chaoqiang~1 Zhu Yan~4 Zheng Xiu~4 Gao Qiang~1 (1 Key Laboratory of Industrial Microbiology,Ministry Education & Tianjin City,College of Biotechnology,Tianjin University of Science and Technology,Tianjin 300457;2 Tianjin Institute for Drug Control,Tianjin 300070;3 Sino-Franch Joint-Venture Dynasty, Tianjin 300402;4 Logistic Service Group,Tianjin University of Science and Technology,Tianjin 300457)
关键词:
Zymomonas mobilis;;Homologous recombination;;L-lactic acid;;Lactate dehydrogenase;;Pyruvate dehydrogenase
摘  要:
The down-stream p3 fragment of Zymomonas mobilis CP4 pdc gene was achieved by PCR using its host genome as the template.The resulting p3 fragment was inserted into vector pBBR1MCS3-Ppdc-ldhL to construct the plasmid pBBRlMCS3-Ppdc-1dhL-p3 which was transformed into Z.mobilis CP4 host by electroporation.Using the Ppdc and p3 fragments as the upstream and downstream parts respectively in the homologous recombination,the pdc gene in Z.mobilis CP4 genome was replaced by ldhL gene from the recombinant plasmid to construct the recombinant strain Z.mobilis CP4(Δpdc::1dhL).Finally,the engineered strain produced 10.8 g/L L-lactic acid,which was obviously higher than its parent strain Z.mobilis CP4.This result demonstrated that the metabolically-engineered Z.mobilis strain for L-lactic acid production was successfully constructed.

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