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茶叶科学 ›› 2015, Vol. 35 ›› Issue (1): 17-23.doi: 10.13305/j.cnki.jts.2015.01.004

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丰水梨多酚氧化酶基因的克隆与原核表达

陈东生, 王坤波*, 李勤, 李娟, 黄建安, 刘仲华*   

  1. 国家植物功能成分利用工程技术研究中心,湖南农业大学茶学教育部重点实验室,湖南 长沙 410128
  • 收稿日期:2014-06-04 修回日期:2014-09-29 出版日期:2015-02-15 发布日期:2019-08-23
  • 通讯作者: *
  • 作者简介:陈东生,男,硕士研究生,主要从事茶树生物技术与种质创新研究。
  • 基金资助:
    国家自然科学基金(30901161)、教育部“新世纪优秀人才支持计划”(NCET-11-096)

The Cloning and Prokaryotic Expression of Polyphenol Oxidase Gene in Pear (Pyrus Pyrifolia Nakai)

CHEN Dongsheng, WANG Kunbo*, LI Qin, LI Juan, HUANG Jian′an, LIU Zhonghua*   

  1. National Research Center of Engineering & Technology for Utilization of Botanical Functional Ingredients, Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha 410128, China
  • Received:2014-06-04 Revised:2014-09-29 Online:2015-02-15 Published:2019-08-23

摘要: 通过PCR方法克隆丰水梨PPO基因全长,并将其登录Genebank,登录号JQ861265。基因全长1782βbp,无内含子,编码的PPO属于亲水性蛋白质,无跨膜结构,含有593个氨基酸,分子量约为65.8βkDa,理论等电点为8.4。N端含有一段由47个氨基酸组成的转运肽。去除转运肽的成熟PPO分子量为60.8βkDa,理论等电点为6.69。PPO中含有两个铜离子结合区,主要位于PPO二级结构中的α-螺旋区域中。原核诱导目的蛋白在诱导3~6βh后积累量较大。诱导蛋白(PPO前体和成熟PPO)均能氧化儿茶素形成茶黄素。

关键词: 多酚氧化酶, 基因克隆, 原核表达, 酶促合成, 茶黄素

Abstract: :The polyphenol oxidase (PPO, GenBank accession No. JQ861265) genes were cloned by PCR from Pyrus Pyrifolia Nakai. The full length of PPO gene was 1β782βbp without introns, coding a precursor peptide. PPO precursor consists of 593 amino acids with a molecular weight of about 65.8βkDa. It has a theoretical PI of 8.4 and has a transit peptide consisting of 47 amino acids. The mature PPO without transit peptide consists of 547 amino acids with a molecular weight of about 60.8βkDa and a theoretical PI of 6.69. There are 2 Cu-binding domain in the α-helix of PPOs. The protein accumulation got a peak in 3-6 hours. The induced proteins (precursor PPO and mature PPO) can oxidize catechins into theaflavins in vitro.

Key words: polyphenol oxidase, gene clone, prokaryotic expression, enzymatic synthesis, theaflavins

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