食品科学

• 生物工程 • 上一篇    下一篇

原生质体诱变选育高产谷胱甘肽菌株及基因表达分析

孙 姜1,朱益波2,王立梅2,邓大庆2,齐 斌2,*   

  1. 1.吉林农业大学食品科学与工程学院,吉林 长春 130118;
    2.常熟理工学院发酵工程技术研究中心,苏州食品生物技术重点实验室,江苏 常熟 215500
  • 出版日期:2013-12-15 发布日期:2014-01-03
  • 通讯作者: 齐 斌
  • 基金资助:

    国家自然科学基金项目(31171758);江苏省高校“青蓝工程”中青年学术带头人项目;苏州市科技发展计划项目(SZS201007)

Mutation of Saccharomyces cerevisiae Protoplasts for Enhanced Production of GSH and Gene Expression of GSH Over-accumulating Mutants

SUN Jiang1,ZHU Yi-bo2,WANG Li-mei2,DENG Da-qing2,QI Bin2,*   

  1. 1. College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China;
    2. Soochow Key Laboratory of Food Biotechnology, Research Centre of Fermentation Engineering Technology,
    Changshu Institute of Technology, Changshu 215500, China
  • Online:2013-12-15 Published:2014-01-03
  • Contact: QI Bin

摘要:

以Saccharomyces cerevisiae Y518为出发菌株,通过原生质体诱变提高产谷胱甘肽的能力。结果表明:用0.03mol/L HNO2处理原生质体3min,致死率为85.96%,突变率为6.85%;经过4轮连续的HNO2诱变,筛选得到一株胞内谷胱甘肽产量(14.85mg/g干质量)约比出发菌株高24%的突变株。进一步研究谷胱甘肽合成相关的基因表达量,发现其合成途径编码限速酶的基因GSH1的表达量上调了2.26倍。因此,突变株胞内谷胱甘肽水平的提高可能是由上调的GSH1的表达量导致的。

关键词: Saccharomyces cerevisiae, 原生质体诱变, 谷胱甘肽, 基因GSH1

Abstract:

In this study, Saccharomyces cerevisiae Y518 was improved for enhanced GSH production by protoplast
mutagenesis. The mortality of Saccharomyces cerevisiae protoplasts after being treated with 0.03 mol/L HNO2 for 3 min
was 85.96%. After 4 repeated treatments, a mutant was obtained which produced 14.85 mg of GSH per g dry weight, a 24%
increase over the original strain. The gene GSH1 encoding the rate-limiting enzyme in the synthesis route showed a 2.26-fold
increased expression, thus resulting in increased GSH production from the mutant strain.

Key words: Saccharomyces cerevisiae, protoplast mutagenesis, glutathione, gene GSH1

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