食品科学 ›› 2009, Vol. 30 ›› Issue (19): 248-251.doi: 10.7506/spkx1002-6630-200919057

• 生物工程 • 上一篇    下一篇

采用自克隆技术构建高SOD、低双乙酰的啤酒酵母工程菌

母茜 1,蔡勇 1,王肇悦2,张博润2,任正隆1 ,*   

  1. 1. 四川农业大学 植物遗传育种省级重点实验室
    3. 中国科学院微生物研究所酵母遗传育种实验室
  • 收稿日期:2008-01-21 出版日期:2009-10-01 发布日期:2010-12-29
  • 通讯作者: 任正隆 E-mail:qianqian84119@sina.com

Construction of Industrial Brewing Yeast with High-SOD and Low-diacetyl Productivity Using Self-cloning Technique

MU Qian1,CAI Yong1,WANG Zhao-yue2,ZHANG Bo-run2,REN Zheng-long1,*   

  1. 1. State Key Laboratory of Plant Breeding and Genetics, Sichuan Agricultural University, Ya'an 625014, China;2. Laboratory of
    Molecular Genetics and Breeding of Yeast, Institute of Microbiology of Chinese Academy of Sciences, Beijing 100101, China
  • Received:2008-01-21 Online:2009-10-01 Published:2010-12-29
  • Contact: REN Zheng-long E-mail:qianqian84119@sina.com

摘要:

用来源于啤酒酵母自身的超氧化物歧化酶基因SOD1、铜抗性基因CUP1、3-磷酸甘油酸激酶基因PGK1启动子和α-factor基因取代α-乙酰乳酸合成酶基因ILV2内部约1.1kb的片段,得到重组质粒pMC572,采用同源重组的方法将用内切酶酶切质粒pMC572得到的含有SOD1、CUP1、PGK1和α-factor以及ILV2两端序列的片段转化啤酒酵母工业菌株YSF31,并通过铜抗性、PCR和AHAS酶活测定筛选得到转化子。结果表明啤酒酵母工程菌胞内的SOD能够分泌到胞外,乙偶姻的含量也只有受体菌的50%,而其他发酵指标并没有发生变化。

关键词: 啤酒酵母, 超氧化物歧化酶, 乙偶姻, 自克隆

Abstract:

A recombinant plasmid pMC572 was constructed through replacing internal fragment of -acetohydroxyacid synthase (AHAS) gene (ILV2) with a fused gene that contained a copper resistant gene (CUP1), PGK1 promoter, -factor sequence and open reading frame of SOD gene from Saccharomyces cerevisiae. An industrial brewing yeast strain, YSF31, was transformed with plasmid pMC572. The self-cloning strains were selected in terms of resistance ability to CuSO4, PCR amplification assay and AHAS activity. The engineered industrial strain exhibited fermentation performance and growth properties similar to the wild type in 500 ml conical flask under identical condition of beer fermentation. Moreover, SOD produced in this industrial strain was detected in fermenting liquor and acetoin was 50% lower than that of the control. Due to DNA manipulation without heterogeneous DNA, the self-cloning strain may be acceptable.

Key words: Saccharomyces cerevisiae, SOD , acetoin , self-cloning

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