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茶叶科学 ›› 2011, Vol. 31 ›› Issue (5): 411-418.doi: 10.13305/j.cnki.jts.2011.05.012

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茶氨酸合成酶基因的全长cDNA克隆及序列分析

李娟, 邓婷婷, 吴扬, 刘硕谦, 李勤, 刘仲华*, 黄建安*   

  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:2011-06-22 修回日期:2011-07-27 出版日期:2011-10-15 发布日期:2019-09-09
  • 作者简介:李娟(1981— ),女,湖南石门人,博士研究生,主要从事茶树分子生物学方面的研究。
  • 基金资助:
    国家自然科学基金(30871572)、湖南农业大学人才稳定基金资助(07WD22)、湖南省研究生创新基金项目(CX2009148)

Full-length cDNA Cloning and Sequence Analysis of Theanine Synthetase Gene in Camellia Sinensis

LI Juan, DENG Ting-ting, WU Yang, LIU Shuo-qian, LI Qin, LIU Zhong-hua*, HUANG Jian-an*   

  1. National Research Center of Engineering &Technology for Utilization of Functional Ingredients from Botanicals, Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha 410128, China
  • Received:2011-06-22 Revised:2011-07-27 Online:2011-10-15 Published:2019-09-09

摘要: 采用SMART RACE技术成功克隆了安吉白茶茶氨酸合成酶基因(TS)的全长cDNA序列,并将其登录Genbank,登录号为JN226569。TS基因的cDNA全长为1503bp,开放阅读框(ORF)为1071bp,编码356个氨基酸。经生物信息学分析,TS蛋白的氨基酸残基数为356,分子量为39250.3Da,理论等电点(PI)为5.79,其氨基酸序列中可能不存在卷曲螺旋结构。TS蛋白不存在信号肽序列,不发生跨膜运动,属于亲水性的非分泌蛋白,其磷酸化位点有26个。通过亚细胞定位预测,安吉白茶TS蛋白是一种细胞质蛋白。克隆茶氨酸合成酶基因的全长cDNA序列,对于利用生物技术手段改良茶树品种,以调控茶树中茶氨酸的含量具有重要意义。

关键词: 茶氨酸合成酶, 全长cDNA克隆, 序列分析

Abstract: The full-length cDNA of theanine synthetase (TS, GenBank accession No.JN226569) gene of Anji white tea was cloned. The cDNA sequence has the full-length of 1503bp, and with an Open Reading Frame of 1071bp. It can encode 356 amino acids. Bioinformatics analysis showed that theanine synthetase has 356 amino acid residues, has a theoretical molecular weight of 39250.3Da and theoretical PI value of 5.79. Bioinformatics prediction showed that this protein is hydrophilic and located not within the transmembrane. There are 26 phosphorylation sites within the polypeptied chain. The signal peptide analysis showed that there is no signal peptide and no winded helix domain present within the sequence, the protein is non-secreted and it functions in the cytoplasm. This reported result about cloning full-length cDNA of theanine synthetase gene would be beneficial for using biotechnology to improve tea plant cultivar resources and regulate L-theanine level.

Key words: theanine synthetase, full-length cDNA cloning, sequence analysis

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