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茶叶科学 ›› 2014, Vol. 34 ›› Issue (2): 188-194.doi: 10.13305/j.cnki.jts.2014.02.015

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合成茶树咖啡碱相关的N-甲基转移酶基因家族的克隆及序列分析

金基强1,2, 姚明哲1, 马春雷1, 马建强1,2, 陈亮1,*   

  1. 1. 中国农业科学院茶叶研究所/国家茶树改良中心,浙江 杭州 310008;
    2. 中国农业科学院研究生院,北京 100081
  • 收稿日期:2013-08-07 修回日期:2013-08-30 出版日期:2014-04-15 发布日期:2019-09-03
  • 通讯作者: *liangchen@mail.tricaas.com
  • 作者简介:金基强(1983— ),男,河南信阳人,助理研究员,主要从事茶树资源育种研究。
  • 基金资助:
    国家茶叶产业技术体系(CARS-23)、国家自然科学基金(30901159、31170624、31100504)、浙江省自然科学基金(Y3090041、LY13C160005)

Cloning and Sequence Analysis of the N-methyltransferase Gene Family Involving in Caffeine Biosynthesis of Tea Plant

JIN Jiqiang1,2, YAO Mingzhe1, MA Chunlei1, MA Jiangqiang1,2, CHEN Liang1,*   

  1. 1. Tea Research Institute of the Chinese Academy of Agricultural Sciences / National Center for Tea Improvement, Hangzhou 310008, China;
    2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2013-08-07 Revised:2013-08-30 Online:2014-04-15 Published:2019-09-03

摘要: 咖啡碱是茶叶中重要的功能成分,它以黄苷为底物,以S-腺苷甲硫氨酸(SAM)为甲基供体,通过N-甲基转移酶(NMT)类催化的一系列甲基化反应合成的产物。根据NMT基因高度相似的特性,利用长片段PCR法和侧翼序列克隆技术分离了白叶一号6种NMTs的基因组DNA全长,其中有2种为已报道的茶树咖啡碱合成酶基因TCS1TCS2,1种为假基因,另3种基因分别被命名为TCS3、TCS4、TCS5,基因结构分析发现这6种基因均由4个外显子和3个内含子组成。山茶属植物的NMTs可聚为5类,其中TCS4TCS5为与其他基因的相似性相对较低的一类。这些结果为今后更好地从基因组水平上剖析茶树咖啡碱的遗传机制提供有用参考。

关键词: 茶树, N-甲基转移酶, 基因家族, 克隆

Abstract: Caffeine is an important bioactive compound in tea. It is synthesized from xanthosine catalysed by N-methyltransferase (NMT) that using S-adenosylmethionine (SAM) as the methyl donor. Based on the characterization of high similarity of CS (Caffeine Synthase) gene sequences, 6 NMTs were cloned from Baiye 1 by using the technique of long PCR and cloning flanking DNA sequence. Two of them are TCS1 and TCS2, one is a pseudogene, and the other three are named TCS3, TCS4 and TCS5, respectively. It was found that these genes were all composed by four exons and three introns through analysis of gene structure. The NMTs of Camellia plants were clustered into 5 groups, the similarity of TCS4 and TCS5 between with other genes is lower. These results provided useful references to dissect the genetic mechanism of caffeine from genome level in tea plant for the future.

Key words: tea plant, N-methyltransferase, gene family, cloning

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