生物技术通报 ›› 2014, Vol. 0 ›› Issue (7): 168-172.

• 研究报告 • 上一篇    下一篇

嗜水气单胞菌转录调控蛋白基因的克隆与序列分析

李雪, 胡秀彩, 兰云, 沈晓静, 吕爱军, 朱爱华   

  1. 江苏师范大学生命科学学院, 徐州 221116
  • 收稿日期:2013-12-24 出版日期:2014-07-15 发布日期:2014-07-16
  • 作者简介:李雪, 女, 硕士研究生, 研究方向:微生物及免疫学;E-mail:lixue52626@163.com
  • 基金资助:
    国家自然科学基金项目(31272692, 30800847)

Cloning and Sequence Analysis of Transcriptional Activator Protein Gene from Aeromonas hydrophila

Li Xue, Hu Xiucai, Lan Yun, Shen Xiaojing, Lü Aijun, Zhu Aihua   

  1. School of Life Science, Jiangsu Normal University, Xuzhou 221116
  • Received:2013-12-24 Published:2014-07-15 Online:2014-07-16

摘要: 根据嗜水气单胞菌(Aeromonas hydrophila)转录调控蛋白(AhyR)基因序列设计特异性引物, 采用PCR方法克隆嗜水气单胞菌Zf1菌株AhyR基因, 测序目的基因大小为1 063 bp。对AhyR基因编码蛋白进行生物信息学分析, 推导其开放阅读框(ORF)编码260 aa, 含有自体诱导物结合域(18-168 aa)、LuxR型螺旋-转角-螺旋(HTH)DNA结合结构域(176-241 aa), 以及13个磷酸化位点(15S、30T、62S、144S、145S、156S、161Y、173S、184T、188T、200S、227S、231Y)。AhyR蛋白三级结构与模板(PDB:3SZT_A)相似性达28.40%, 结果显示LuxR型螺旋-转角-螺旋结构域主要以α螺旋分布在C端外侧, 这与拉马钱德兰图(Ramachandran plot)检测分析AhyR蛋白空间结构基本一致。

关键词: 嗜水气单胞菌, 转录调控蛋白, 序列分析, 三级结构

Abstract: Transcriptional activator protein(AhyR)gene of Aeromonas hydrophila strain Zf1 was amplified by PCR using the designed primers, resulting in a 1 063 bp DNA sequence. The sequencing analyses revealed AhyR gene encoding a protein of 260 amino acids which has autoinducer binding domain(18-168 aa)and LuxR-type helix-turn-helix(HTH)domain for DNA binding(176-241 aa). Moreover, AhyR protein was predicted containing 13 phosphorylation sites(ie., 15S, 30T, 62S, 144S, 145S, 156S, 161Y, 173S, 184T, 188T, 200S, 227S and 231Y). The homology modeling of 3D structure of AhyR protein was carried out based on the template retrieved from chain A of quorum sensing control repressor(PDB:3SZT_A). AhyR protein showed the homology of 28.40% with the standard model, and the physiological activity subunit LuxR-type HTH domain profile was located in the outer surface of the C-terminal. The quality of the resulting protein structure was further checked by the Ramachandran plot.

Key words: Aeromonas hydrophila, Transcriptional activator protein, Sequence analysis, 3D structure