生物技术通报 ›› 2016, Vol. 32 ›› Issue (9): 179-188.doi: 10.13560/j.cnki.biotech.bull.1985.2016.09.024

• 研究报告 • 上一篇    下一篇

指状青霉cyt b5和cyt b5r基因克隆及与cyp51A表达

秦婷婷, 耿辉, 王胜强, 牛玉慧, 伍志刘德立   

  1. 华中师范大学生命科学学院 湖北省遗传调控与整合生物学重点实验室,武汉 430079
  • 收稿日期:2016-01-18 出版日期:2016-09-25 发布日期:2016-10-10
  • 作者简介:秦婷婷,女,硕士,研究方向:生物化学与分子生物学;E-mail:tingtingqin1990@sina.com
  • 基金资助:
    国家自然科学基金项目(31371893,31071653)

Cloning of Gene cyt b5 and cyt b5r and Their Co-expression with cyp51A in Penicillium digitatum

QIN Ting-ting, GENG Hui, WANG Sheng-qiang, NIU Yu-hui, WU Zhi, LIU De-li   

  1. Hubei Key Laboratory of Genetic Regulation and Integrative Biology,School of Life Sciences,Central China Normal University,Wuhan 430079
  • Received:2016-01-18 Published:2016-09-25 Online:2016-10-10

摘要: 为探究指状青霉细胞色素b5(Cyt b5)与细胞色素b5还原酶(Cyt b5r)在细胞色素P450 CYP51A电子传递方面的功用,研究了指状青霉CYP51A与Cyt b5-Cyt b5r共表达机制;并检测了其对于cyp51A基因表达水平的影响。通过转录组分析筛选并PCR克隆获得了cyt b5与 cyt b5r基因,分别命名为HS-Pdcyt b5和HS-Pdcyt b5r。以多基因串联克隆载体pPICZαA为骨架构建了指状青霉共表达质粒ppbrA(pPIC-Pdcyp51A-cyt b5-cyt b5r);电转化法将重组质粒ppbrA导入毕赤酵母X-33中。qRT-PCR分析结果显示,CYP51A与Cyt b5-Cyt b5r共表达后,其基因表达水平升高54%-97%,并维持较长时间(48-72 h)。表明Cyt b5-Cyt b5r系统可将电子高效转移给CYP51A,从而增强cyp51A基因的转录表达。从指状青霉中克隆表达HS-PdCyt b5和HS-PdCyt b5r蛋白,并通过共表达的方式研究cyp51A基因的功能尚为首次报道。

关键词: 指状青霉CYP51A, 共表达, 细胞色素b5, 细胞色素b5还原酶, 毕赤酵母X-33

Abstract: In order to investigate the role of Cytochrome b5(Cyt b5)and Cytochrome b5 reductase(Cyt b5r)in the electron transport of cytochrome P450 CYP51A in Penicillium digitatum,the co-expression mechanism of CYP51A and Cyt b5-Cyt b5r in P. digitatum was studied,and its effects on the expression of gene cyp51A was detected. By analyzing and screening transcriptome as well as PCR cloning,gene cyt b5 and cyt b5r were acquired and designated as HS-Pdcyt b5 and HS-Pdcyt b5r. Further,a co-expressed plasmid vector ppbrA(pPIC-Pdcyp51A-cyt b5-cyt b5r)was constructed successfully using multiple-gene series cloning vector pPICZαA. This recombinant plasmid ppbrA was transformed into Pichia pastoris X-33 by electroporation. Analysis by qRT-PCR revealed that after CYP51A was co-expressed with Cyt b5-Cyt b5r,the expression level of cyp51A increased 54%-97% and it remained in a long period(48-72 h). This indicated that the Cyt b5-Cyt b5r complex was capable of transferring electrons to CYP51A,which thus enhanced the transcript expression level of cyp51A. This is the first report regarding cloning and expressing HS-PdCyt b5 and HS-PdCyt b5r proteins from P. digitatum,and explore the function of P. digitatum’s gene cyp51A by co-expressing system.

Key words: Penicillium digitatum CYP51A, co-expression, cytochrome b5, cytochrome b5 reductase, Pichia pastoris X-33