畜牧与饲料科学 ›› 2020, Vol. 41 ›› Issue (5): 13-18.doi: 10.12160/j.issn.1672-5190.2020.05.003

• 基础研究 • 上一篇    下一篇

梭梭HabHLH74转录因子基因的克隆及在大肠杆菌中的表达

王力伟1, 赵沛义1, 王朝2, 房永雨1, 刘红葵1, 郭慧琴2, 王蕴华1, 何江峰1   

  1. 1.内蒙古自治区农牧业科学院, 内蒙古 呼和浩特 010031;
    2.内蒙古农业大学生命科学学院, 内蒙古 呼和浩特 010011
  • 收稿日期:2020-07-07 发布日期:2020-10-21
  • 通讯作者: 何江峰(1979—), 女, 副研究员, 博士, 主要研究方向为分子抗逆机制。
  • 作者简介:王力伟(1990—), 男, 助理研究员, 博士研究生, 主要研究方向为分子抗逆机制。

Gene Cloning of Transcription Factor HabHLH74 from Haloxylon ammodendron and Expression in Escherichia coli

WANG Li-wei1, ZHAO Pei-yi1, WANG Chao2, FANG Yong-yu1, LIU Hong-kui1, GUO Hui-qin2, WANG Yun-hua1, HE Jiang-feng1   

  1. 1.Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China;
    2. College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010011, China
  • Received:2020-07-07 Published:2020-10-21

摘要: 利用分子生物学技术从梭梭中克隆了HabHLH74转录因子基因, 在大肠杆菌中表达HabHLH74蛋白, 旨在为梭梭抗逆分子机理提供研究基础。研究结果表明:①利用RT-PCR技术成功扩增了HabHLH74的完整编码区cDNA序列, HabHLH74编码区cDNA序列长度为1 218 bp。根据HabHLH74编码区序列预测出其编码蛋白的理化性质。②成功构建了HabHLH74基因的原核表达载体pET28a(+)-HabHLH74, 并在大肠杆菌中成功表达了梭梭HabHLH74蛋白, 其分子量为43.6 kDa。③对诱导条件进行单因素试验后获得的最佳诱导表达条件:诱导剂IPTG浓度为0.5 mmol/L, 诱导温度为37 ℃, 诱导时间为6 h。④对在优化条件下诱导后的菌体进行超声破碎后发现梭梭HabHLH74蛋白主要以包涵体形式存在;降低诱导温度(16 ℃、25 ℃诱导)未能得到可溶性表达的梭梭HabHLH74蛋白。

关键词: 梭梭, HabHLH74转录因子, 克隆, 原核表达

Abstract: In order to reveal the molecular mechanism underlining the resistant feature of Haloxylon ammodendron, the gene of transcription factor HabHLH74 was cloned from Haloxylon ammodendron and was subsequently expressed in Escherichia coliE. coli) by using molecular biology technology in this study. The results showed that ① The cDNA sequence of complete coding region of HabHLH74 was successfully amplified using RT-PCR assay, and the length of the coding sequence was 1 218 bp. According to the coding sequence, the physical and chemical properties of its encoding protein were predicted. ② A prokaryotic expression vector of pET28a (+) -HabHLH74 was constructed, and the HabHLH74 protein was expressed successfully in E. coli. The molecular weight of the obtained protein was 43.6 kDa. ③The induced expression condition was optimized by a single factor test. The optimal IPTG concentration, induction temperature and induction time were 0.5 mmol/L, 37 ℃ and 6 h, respectively. ④ Under the optimized induced expression condition, the HabHLH74 protein was expressed in inclusion bodies in E. coli. After decreasing the induction temperature (at 16 ℃ or 25 ℃), the target protein was still expressed in inclusion form in E. coli.

Key words: Haloxylon ammodendron, HabHLH74 transcription factor, cloning, prokaryotic expression

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