生物技术通报 ›› 2019, Vol. 35 ›› Issue (3): 65-70.doi: 10.13560/j.cnki.biotech.bull.1985.2018-0976

• 研究报告 • 上一篇    下一篇

戈壁异常球菌角蛋白酶基因的克隆及功能研究

耿秀秀1,2, 周正富2, 刘盈盈2, 平淑珍2, 王劲1,2   

  1. 1. 西南科技大学生命科学与工程学院,绵阳 621000;
    2. 中国农业科学院生物技术研究所,北京 100081
  • 收稿日期:2018-11-13 出版日期:2019-03-26 发布日期:2019-04-03
  • 作者简介:耿秀秀,女,硕士研究生,研究方向:酶制剂;E-mail:2276609172@qq.com
  • 基金资助:
    国家自然科学基金项目(31500063),国家重点基础研究发展计划(“973”计划)(2013CB733903),西南科技大学博士基金(18zx7127)

Cloning and Identification of Keratinase Gene from Deinococcus gobiensis I-0

GENG Xiu-xiu1,2, ZHOU Zheng-fu2, LIU Ying-ying2, PING Shu-zhen2, WANG Jin1,2   

  1. 1. College of Life Science and Engineering,Southwest University of Science and Technology,Mianyang 621000;
    2. Biotechnology Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081
  • Received:2018-11-13 Published:2019-03-26 Online:2019-04-03

摘要: 旨为深入发掘角蛋白酶重要的基因资源,进一步提高其水解酶活,为工业生产提供理论基础。从分离于新疆戈壁沙漠的戈壁异常球菌(Deinococcus gobiensis)I-0中克隆出一个编码角蛋白酶的基因并命名Dgker。构建原核表达载体pET -22b -Dgker并进行体外诱导表达纯化,通过对羽毛水解活性的测定探究粗酶液的最适温度和pH。结果显示,Dgker蛋白N端前50个氨基酸对蛋白的表达纯化有很大影响。Dgker的重组菌株3d完全分解羽毛,在奶粉平板上重组菌株粗酶液比空载菌株粗酶液降解圈更显著。Dgker适应的温度和pH较为广泛其中最适温度是60℃、最适pH是5.0。Dgker能降解羽毛在以后的工业生产及处理废弃羽毛有极大的应用空间。

关键词: 角蛋白, 戈壁异常球菌, 角蛋白酶, 酶活

Abstract: In order to further tap the important gene resources of keratinase,improve its hydrolytic activity,and provide theoretical basis for industrial production,this experiment cloned a gene encoding keratinase from Deinococcus gobiensis I-0 isolated from Gobi desert of Xinjiang and named it as Dgker. Prokaryotic expression vector pET-22B-Dgker was constructed and then induced,expressed and purified in vitro,the optimal temperature and pH of the crude enzyme solution were determined through the hydrolysis activity to feathers. Results showed that the first 50 amino acids of N terminal had a great influence on the expression and purification of protein Dgker. The crude enzyme solution of recombinant strain completely decomposed feathers in three days. The transparent circle on milk powder plate appeared more notable in crude enzyme solution of recombinant strain than that of empty strain. Dgker adapted to a wide range of temperatures and pH,among which the optimal temperature was 60℃ and the optimal pH was 5.0. Dgker can degrade feathers and thus will have great application space in the future industrial production and treatment of waste feathers.

Key words: keratin, Deinococcus gobiensis I-0, keratinase, enzyme activity