食品科学 ›› 2012, Vol. 33 ›› Issue (19): 211-215.

• 生物工程 • 上一篇    下一篇

采用全基因组改组技术选育蛋白酶高产菌株

王景会1,2 ,刘景圣1,*,高 岩1,马颖辉3,李玉秋2,牛春华2   

  1. 1.吉林农业大学食品科学与工程学院 2.吉林省农业科学院农产品加工研究中心 3.黑龙江八一农垦大学食品学院
  • 收稿日期:2011-08-05 修回日期:2012-08-08 出版日期:2012-10-15 发布日期:2012-09-17
  • 通讯作者: 刘景圣 E-mail:liujs1007@vip.sina.com.cn
  • 基金资助:

    国家“863”计划项目;吉林省科技发展计划

Whole Genome Shuffling of Bacillus subtilis for Enhanced Protease Production

  • Received:2011-08-05 Revised:2012-08-08 Online:2012-10-15 Published:2012-09-17

摘要: 为了提高枯草芽孢杆菌B4的蛋白酶产量,采用全基因组改组技术进行菌株选育,先通过紫外诱变构建了B4菌的突变体库,在优化其原生质体制备和再生条件的基础上,以其中4株诱变菌株(BRS1、BRS2、BRS5、BRS6)作为亲本,采用PEG介导的方法进行两次多亲本的全基因组改组,同时,结合双亲灭活的筛选方法,共筛选出3株酶活力大幅度提高并能稳定遗传的优良菌株,为BRS1、BRS5、BRS6,酶活力最高达2175.81U/mL,达到原始菌株的3.01倍。

关键词: 枯草芽孢杆菌, 蛋白酶, 基因组改组

Abstract: Whole genome shuffling technique was used to enhance protease production by Bacillus subtilis B4. A candidate mutant library was constructed by UV irradiation of Bacillus subtilis B4. Based on the optimum conditions for protoplast preparation and regeneration, multi-parental whole genome shuffling was carried out with 4 mutant strains (BRS1, BRS2, BRS5 and BRS6) by PEG mediated protoplasts fusion. Then BRS1, BRS5 and BRS6 were identified by biparental inactivation method as 3 excellent strains with greatly improved protease activity and good genetic stability. The maximum activity was as high as 2175.81 U/mL, which was increased 3.01 fold compared with the initial strain B4.

Key words: Bacillus subtilis, protease, genome shuffling

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