生物技术通报 ›› 2012, Vol. 0 ›› Issue (12): 114-119.

• 研究报告 • 上一篇    下一篇

水稻白叶枯病菌ahpC 基因转录单元分析和原核表达

王艳丽, 吴茂森, 田芳, 陈华民, 何晨阳   

  1. 中国农业科学院植物保护研究所 植物病虫害生物学国家重点实验室,北京 100193
  • 收稿日期:2012-04-26 修回日期:2013-01-25 出版日期:2012-12-26 发布日期:2013-02-06
  • 作者简介:王艳丽, 硕士研究生, 研究方向分子植物病理学;E-mail:0314yanli@163.com
  • 基金资助:
    :国家“973”计划项目课题(2011CB100701)

Transcriptional Regulation Analysis and Prokaryotic Expression ofahpC Gene Putatively-encoding Alkyl Hydroperoxide Reductase inXanthomonas oryzae pv. oryzae

Wang Yanli, Wu Maosen, Tian Fang, Chen Huamin, He Chenyang   

  1. State Key Laboratory for Biology of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100193
  • Received:2012-04-26 Revised:2013-01-25 Published:2012-12-26 Online:2013-02-06

摘要: 从水稻白叶枯病菌(Xanthomonas oryzae pv. Oryzae,Xoo)菌株PXO99A 中克隆了H2O2 降解基因ahpC,发现其编码的烷基过氧化氢酶ahpC在所测定的不同种病原细菌中的蛋白序列高度保守;采用RT-PCR 方法分析了基因的转录结构特征,发现ahpC基因与酶电子供体基因ahpF 组成了同一个转录单元;通过对ahpCp-lacZ 活性检测,发现该启动子活性显著地受转录调控因子OxyR 的正调控。此外,利用表达载体pET-28a(+)对ahpC 基因进行了原核表达,经诱导后获得了可溶性的靶蛋白,可用于后续的生物学功能的分析。

关键词: 水稻白叶枯病菌, ahpC基因, 转录调控, 原核表达

Abstract: The ahpC gene involved in degradation of hydrogen peroxide was cloned from the wild-type strain PXO99A of Xanthomonasoryzae pv. oryzae in this study. The gene putatively encodes the alkyl hydroperoxide reductase AhpC. The sequence of ahpC protein is highlyconserved in different kinds of pathogenic bacteria tested. To find out the structural characteristics of transcription of the gene cluster oxyR-ahpFahpC,reverse transcription PCR(RT-PCR)analysis revealed that ahpC and ahpF gene, the enzyme electron donor gene are co-transcribed inthe same operon and same transcriptional unit. The activity of ahpCp-lacZ was detected, suggesting the ahpC promoter activity was positivelyregulated by transcriptional regulator factor OxyR. In addition, construction of expression vector of ahpC using pET-28a(+)and prokaryoticexpression was performed. The soluble recombinant proteins were expressed, which could be purified and used for further biological functionanalysis.

Key words: Xanthomonas oryzae pv. oryzae, ahpC gene, Transcriptional regulation, Prokaryotic expression