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中国农学通报 ›› 2020, Vol. 36 ›› Issue (30): 98-105.doi: 10.11924/j.issn.1000-6850.casb20191000699

• 生物科学 • 上一篇    下一篇

一种高产L-赖氨酸枯草芽孢杆菌的构建研究

夏树立1(), 韩静1, 王丽学2, 杨春蕾1, 刘长悦3, 王海亮4, 吴贶5, 史慧玲1()   

  1. 1天津市畜牧兽医研究所,天津 300380
    2天津市农业科学院信息研究所,天津 300192
    3天津科润农业科技股份有限公司黄瓜研究所,天津 300192
    4天津市现代农业科技创新基地管理中心,天津 301700
    5天津市农业科学院,天津 300192
  • 收稿日期:2019-10-09 修回日期:2019-11-13 出版日期:2020-10-25 发布日期:2020-10-16
  • 通讯作者: 史慧玲
  • 作者简介:夏树立,男,1971年出生,副研究员,本科,研究方向:家禽育种、生态养殖、非常规饲料资源研发,主持、参与国家和省级科研项目25项,获得全国农牧渔业丰收奖二等奖,著作8部,授权发明专利15项。通信地址:300380 天津市西青区津静公路17公里处天津市畜牧兽医研究所,Tel:022-83726967,E-mail: tjxmsxshl@sina.com
  • 基金资助:
    天津市科技重大专项与工程“农村科技帮扶工程:家禽特色蛋品标准化生产技术集成与应用”(18ZXBFNC00350);天津市农业科学院青年科技创新重点项目“非抗性稳定高产L-赖氨酸枯草芽孢杆菌工程菌株的构建及应用”(201801)

A Strain of Bacillus subtilis Producing High-Yield L-lysine: Construction

Xia Shuli1(), Han Jing1, Wang Lixue2, Yang Chunlei1, Liu Changyue3, Wang Hailiang4, Wu Kuang5, Shi Huiling1()   

  1. 1Tianjin Institute of Animal Husbandry and Veterinary Medicine, Tianjin 300380
    2Tianjin Institute of Agricultural Sciences Information Institute, Tianjin 300192
    3Tianjin Branch of Tianjin Kerun Agricultural Technology Co., Ltd., Tianjin 300192
    4Tianjin Modern Agricultural Science and Technology Innovation Base Management Center, Tianjin 301700
    5Tianjin Academy of Agricultural Sciences, Tianjin 300192
  • Received:2019-10-09 Revised:2019-11-13 Online:2020-10-25 Published:2020-10-16
  • Contact: Shi Huiling

摘要:

为了选育一种非抗性、高产出、遗传稳定性好、低生产成本的L-赖氨酸生产菌株,以辣椒花药和枯草芽孢杆菌为试验材料,以穿梭表达载体pHT43和基因敲除载体pK18mobsacB为媒介,将辣椒花药中的高赖氨酸基因CFLR转化到枯草芽孢杆菌中。经过2次细胞内同源交换和培养基筛选,最终获得不带质粒抗性标记的高产L-赖氨酸枯草芽孢杆菌株CMCC(B)63501/pK18mobsacB-ΔALA::CFLR,该菌株连续传代20次后仍具有明显高于野生型的CFLR基因拷贝数,经HPLC验证,重组菌株L-赖氨酸含量比野生菌株提高了64.89%。结果表明,本研究所构建的非抗性高产L-赖氨酸枯草芽孢杆菌株产量高、遗传稳定性好、低纯化成本,具有良好的应用潜力。

关键词: 辣椒高赖氨酸基因, 枯草芽孢杆菌, 基因克隆, 同源交换, HPLC

Abstract:

To breed a strain producing L-lysine with non-resistance, high yield, good genetic stability, low production cost, pepper anther and Bacillus subtilis were used as test materials, the shuttle expression vector pHT43 and gene knockout vector pK18mobsacB was performed as a vector to transform lysine-rich protein gene (CFLR) into Bacillus subtilis. After two rounds of self-recombination and screening of culture medium, the final strain CMCC (B) 63501/pK18mobsacB-ΔALA::CFLR, with high yield of L-lysine was obtained without antibiotic resistance. After 20 generations of serial passage, the strain still expressed a significant higher number of CFLR copies than the wild type. The subsequent data of High-Performance Liquid Chromatography (HPLC) revealed that the content of L-lysine in recombinant strain was 64.89% higher than that of the wild strain. The above results indicated that the recombinant strain we constructed were featured with non-resistance, high yield, good genetic stability and low purification cost. Therefore, the strain exhibits outstanding potential for future applications.

Key words: CFLR gene, Bacillus subtilis, gene cloning, homologous exchange, HPLC

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