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草业学报 ›› 2013, Vol. 22 ›› Issue (6): 230-238.DOI: 10.11686/cyxb20130629

• 研究论文 • 上一篇    下一篇

拟南芥高亲和性K+载体蛋白基因cDNA克隆及其序列特征分析

王丽1,2,3,张俊莲1,3,4*,张金文1,3,4,刘玉汇1,3,白江平1,3,4,余斌1,3,杨宏羽1,3,4,王蒂1,3,4*   

  1. 1.甘肃省作物遗传改良与种质创新重点实验室,甘肃 兰州730070;
    2.甘肃农业大学生命科学技术学院,甘肃 兰州730070;
    3.甘肃省干旱生境作物学重点实验室,甘肃 兰州 730070;
    4.甘肃农业大学农学院,甘肃 兰州730070
  • 出版日期:2013-12-20 发布日期:2013-12-20
  • 通讯作者: 王丽(1981-),女,甘肃兰州人,讲师,在读博士。E-mail:39726821@qq.com
    *通讯作者。E-mail:zhangjl@gsau.edu.cn,wangd@gsau.edu.cn
  • 作者简介:王丽(1981-),女,甘肃兰州人,讲师,在读博士。
  • 基金资助:
    高等学校博士学科点专项基金项目(20106202110007),国家科技支撑计划项目(2012BAD06B03),甘肃省干旱生境作物学重点实验室开放基金(GSCS-2012-12)和甘肃农业大学科技创新基金项目(GAU-CX1024)资助。

Cloning and analysis of sequence characteristics of cDNA encoding the AtHKT1 gene from Arabidopsis thaliana leaves

WANG Li1,2,3, ZHANG Jun-lian1,3,4, ZHANG Jin-wen1,3,4, LIU Yu-hui1,3, Bai Jiang-ping1,3,4, YU Bin1,3, YANG Hong-yu1,3,4, WANG Di1,3,4   

  1. 1.Gansu Key Laboratory of Crop Genetic & Germplasm Enhancement, Lanzhou 730070, China;
    2.College of Life Sciences and Technology,Gansu Agricultural University, Lanzhou 730070, China;
    3.Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou 730070, China;
    4.College of Agronomic, Gansu Agricultural University, Lanzhou 730070, China
  • Online:2013-12-20 Published:2013-12-20

摘要: 以NaCl胁迫处理的拟南芥幼苗叶片为材料,用RNA提取试剂盒抽提总RNA,通过RT-PCR技术和DNA序列测定分析,证实获得了拟南芥高亲和性K+载体蛋白基因(AtHKT1)的cDNA序列。该cDNA全长1521 bp,包括506个氨基酸和1个终止密码子序列,且与原序列(accession number AF237672)同源性为99.34%,但与其他科植物HKT1基因同源性较低,注册该基因到GenBank中,注册号为AY685182。利用生物信息学相关软件分析预测AtHKT1基因蛋白质功能和结构,结果发现,该蛋白分子量为57.45 kD,理论等电点为9.33;氨基酸序列中第1~40个氨基酸属信号肽序列;第152~500个氨基酸属Trk H阳离子转运体蛋白保守结构域,并存在蛋白激酶C,酪氨酸蛋白激酶,依赖cAMP/cGMP蛋白激酶磷酸化,糖基化和豆蔻酰化等功能位点;该基因编码的蛋白有10个跨膜结构,N末端、C末端及中部等多个跨膜区具疏水性,符合载体类运输蛋白特点。表明本研究获得了拟南芥AtHKT1基因。

Abstract: The full length coding sequence of AtHKT1 was cloned via RT-PCR (reverse transcription-polymerase chain reaction) from the leaves of Arabidopsis thaliana seedling under NaCl stress. The full-length cDNA contained 1521 bp and encoded a polypeptide of 506 amino acids and a termination codon. The sequence shared 99.34% homology with the reported sequence (accession number AF237672), but the homologies were very low compared with similar genes from other plants. The gene was submitted to GenBank and was given the registration number AY685182. Bioinformatics softwares were used to predict and analyze the protein function and structure of the AtHKT1 gene cDNA sequence. The molecular weight of the deduced polypeptide of AtHKT1 was 57.45 kD. The theoretical pI was 9.33. The N-terminal amino acids from 1 to 40 formed a classic signal peptide sequence. The peptide from 152 to 500 was a Trk H cation transporter conserved domain. It might also carry protein kinase C, tyrosine kinase, cAMP-and cGMP-dependent protein kinase phosphorylation, glycosylation, N-myristoylation sites and other function sites. The deduced peptide contained 10 transmembrane domains. The transmembrane domains near the N-terminus, the C-terminus and the middle part of the peptide displayed high hydrophobicity. Therefore, it is suggested that the gene product of AtHKT1 might play roles in facilitating cation transportation.

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