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茶叶科学 ›› 2011, Vol. 31 ›› Issue (1): 33-39.doi: 10.13305/j.cnki.jts.2011.01.006

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茶树多酚氧化酶基因的生物信息学分析及原核表达

王乃栋, 张丽霞*, 向勤锃, 李巍巍   

  1. 山东农业大学园艺科学与工程学院,作物生物学国家重点实验室,山东 泰安 271018
  • 收稿日期:2010-04-22 修回日期:2010-06-30 出版日期:2011-02-15 发布日期:2019-09-06
  • 作者简介:王乃栋(1984— ),男,山东泰安人,博士研究生,主要从事茶叶生物技术研究。
  • 基金资助:
    山东省自然科学基金项目(ZR2010CM026)、山东省泰安市大学生创新行动计划项目 (2009D1016)

Bioinformatic Analysis and Prokaryotic Expression of Polyphenol Oxidase Gene in Tea Plant (Camellia sinensis)

WANG Nai-dong, ZHANG Li-xia*, XIANG Qin-zeng, LI Wei-wei   

  1. College of horticμlture science and engineering, state key laboratory of crop biology, Tai,an 271018, China
  • Received:2010-04-22 Revised:2010-06-30 Online:2011-02-15 Published:2019-09-06

摘要: 通过PCR方法扩增出迎霜品种茶多酚氧化酶(PPO)的编码区序列,并将其登录于GenBank,注册号为GQ214317。生物信息学分析表明,该基因编码区全长1800bp,编码599个氨基酸,分子式为C3008H4677N813O900S18,存在两个铜离子结合域,没有跨膜区;进化树分析表明,茶与毛叶茶亲缘关系最近。成功构建了原核表达载体pET-ppo,并转化E. coli BL21(DE3),实现了PPO的原核表达。SDS-PAGE电泳检测结果表明,在71KD处有一条特异蛋白条带,与预测大小相符。

关键词: 多酚氧化酶, 生物信息学分析, 原核表达

Abstract: The polyphenol oxidase (PPO, GenBank accession No. DQ812086) gene was amplified by PCR. Bioinformatics analysis indicated that the cds of PPO DNA sequence is 1800bp, which encoded a protein of 599 amino acid residues (molecular formula: C3008H4677N813O900S18) and predicted that it had two Cu-band functional domains with no transmembrane. The phylogeny analysis showed that it has a most close phylogenetic relationship with Camellia nitidissima. The PPO was cloned into pET28a vector to construct recombination prokaryotic expression vector pET-ppo. After transformed to E1coli BL21 and induced by isopropyl-β-D-thiogalactopyranoside(IPTG), recombinant protein about 71kD was expressed in pET28a system and separated by SDS-PAGE electrophoresis.

Key words: polyphenol oxidase, bioinformatics analysis, prokaryotic expression

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