生物技术通报 ›› 2014, Vol. 0 ›› Issue (6): 168-172.

• 研究报告 • 上一篇    下一篇

红树林土壤微生物宏基因组文库的构建及两种新颖的 β-葡萄糖苷酶基因的鉴定

麦志茂, 苏宏飞, 李丽珍, 张偲   

  1. (中国科学院南海海洋研究所 中国科学院海洋生物资源可持续利用重点实验室,广州 510301)
  • 收稿日期:2013-12-13 出版日期:2014-06-25 发布日期:2014-06-25
  • 作者简介:麦志茂,男,博士研究生,研究方向:海洋微生物酶的开发与利用;E-mail:maizhimao@163.com
  • 基金资助:
    国家重点基础研究发展计划(“973”)(2010CB833801),国家自然科学基金重点项目(41230962)

Construction of a Mangrove Soil Metagenome Library and Identification of Two Novel β-Glucosidase Genes

Mai Zhimao, Su Hongfei, Li Lizhen, Zhang Si   

  1. (Key Laboratory of Marine Bio-resources Sustainable Utilization,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301)
  • Received:2013-12-13 Published:2014-06-25 Online:2014-06-25

摘要: 宏基因组技术是挖掘微生物新酶的重要途径。通过构建红树林土壤微生物Fosmid文库,共获得了约100 000个阳性克隆,该文库外源插入片段平均长度约为30 kb,文库容量达3 Gb。通过对文库中10 000个克隆进行功能筛选,获得了17个具有β-葡萄糖苷酶活性的克隆。对其中2个表达β-葡萄糖苷酶的克隆进行亚克隆,获得2个新颖的β-葡萄糖苷酶的基因,分别命名MhGH3bgl66。生物信息学分析表明,MhGH3基因由1 992个碱基对组成,bgl66基因由2 025个碱基对组成。在氨基酸水平上,MhGH3bgl66编码的蛋白质与GenBank 数据库中已知β-葡萄糖苷酶的一致性分别为64%和55%。

关键词: β-葡萄糖苷酶, 纤维素酶, 红树林, 宏基因组文库

Abstract: Metagenomics provides a means of exploring new enzymes in microorganisms. A mangrove soil metagenome library with 100 000 clones was constructed. The average length of inserted DNA fragment is about 30 kb, and the total capacity of inserted DNA reached about 3 Gb. Seventeen clones with β-glucosidase activity were detected by screening 10 000 fosmid clones. The subcloning and sequencing revealed two novel β-glucosidase genes(MhGH3 and bgl66). Bioinformatics analysis indicated that MhGH3 and bgl66 composed of 1 992 bp and 2 025 bp in length, respectively. The deduced amino acid sequence of MhGH3 and bgl66 showed the highest sequence identity of 64% and 55% with the known β-glucosidase in GenBank datebase, respectively.

Key words: β-Glucosidase, Cellulase, Mangrove, Metagenomic library