玉米黑粉菌CYP51稀有密码子和mRNA二级结构分析及与杀菌剂戊唑醇分子对接
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国家自然科学基金(30771429, 31071653), 国家高技术研究发展 计划(863)(2007AA05Z417)和教育部博士点基金(20060511002)资助项目


Analysis of rare codon and mRNA structure about Ustilago maydis CYP51 and molecular docking with fungicide tebuconazole
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This work was supported by grants from The National Natural Science Foundation of China(30771429, 31071653), Hi-Tech Research and Development Program of China (2007AA05Z417) and The Specialized Research Fund for the Doctoral Program of Higher Education (20060511002)

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    摘要:

    通过截短玉米黑粉菌CYP51(P450-14DM,UmCYP51)基因(去除编码跨膜区部分)和选取不同的表达载体,构建了9种重组表达质粒,在大肠杆菌中进行UmCYP51基因的表达,发现只有BL21(DE3)/pET32-Um-35重组表达工程菌获得了表达.对稀有密码子和mRNA翻译起始区二级结构进行分析,结果表明稀有密码子和 mRNA 翻译起始区二级结构对UmCYP51蛋白的表达都有影响.适用于稀有密码子表达的菌株 Rosetta(DE3)不利于UmCYP51蛋白的表达;同时只有翻译起始区二级结构自由能值最低的重组载体pET32-Um-35可以表达.为了设计以UmCYP51为靶标的新型抗真菌抑制剂,基于最新解析的真核生物人类的CYP51晶体结构,利用同源模建的方法构建了UmCYP51的三维结构并进行了分子动力学模拟优化.通过与商品化杀菌剂戊唑醇进行分子对接获得了此类抑制剂与UmCYP51的理论结合方式,阐述了戊唑醇分子的杀菌机理,为开发新型的抗真菌抑制剂奠定了基础.

    Abstract:

    To get a better optimization expression of the Ustilago maydis CYP51 (P450-14DM, UmCYP51) protein in E. coli BL21(DE3), the different lengths of UmCYP51 gene that lacked the coding region for the putative membrane-spanning segment of the N-terminus were truncated. The first one is the wild type, the second one with 20 amino acids (60 base pairs) in N-terminus was truncated and the third one with 35 amino acids (105 base pairs) was truncated. Then these genes were incorporated into different expression vectors (pET28, pET32 and pGEX-KG) to construct nine recombinant expression plasmids (pET28-Um, pET28-Um-20, pET28-Um-35,pET32-Um, pET32-Um-20, pET32-Um-35, pGEXKG-Um, pGEXKG-Um-20 and pGEXKG-Um-35). The expression of recombinant plasmids were performed using 0.5 mmol/L of isopropyl β-D-thiogalactoside (IPTG) at 30℃. The culture harvested every 2 h up to 8 h. It was found that only recombinant plasmid pET32-Um-35 was expressed in E. coli BL21(DE3). Codon usage database (http//:www.kazusa.or.jp/coden) was used for the analysis of rare codon and software RNAStructure 4.5 was employed to study the mRNA secondary structure of translation initiation region. The results showed that rare codons rate in UmCYP51 gene is only 4.63%, the Rosetta (DE3) strain expressing some rare codons is not suitable for the protein expression of UmCYP51. Only the lowest energy of mRNA structure for pET32-Um-35 can obtained protein expression. These results are compatible with the experiments. Moreover, to design novel antifungal compounds against UmCYP51, based on the recently determined X-ray crystal structure human CYP51, a three-dimensional structure model of UmCYP51 was built through homology modeling using MODELLER 9V7 program. After refinement of the energy minimization and MD simulation using GROMACS 4.0.3 package, the UmCYP51 model was evaluated by PROCHECK Ramachandran plot statistics that indicated the designed model was in good quality. Commercial fungicide tebuconazole was docked into the model protein using Autodock 4.2.3 program to form the binding pattern of inhibitor with UmCYP51. The docking conformation of tebuconazole in the active site of UmCYP51 showed that the N-4 of the triazole ring was bound to heme iron with a distance about 0.245 nm. The hydroxy group of tebuconazole formed hydrogen-bonding interaction with the oxygen atom of carbonyl group for Ala265 with a distance about 0.245 nm. The mechanism of inhibitory activity of tebuconazole against UmCYP51 obtained from this study could aid in designing new antifungal compounds targeting this enzyme.

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李书祥,韩睿,袁利玲,熊丽,袁永泽,杨江科,闫云君,刘德立.玉米黑粉菌CYP51稀有密码子和mRNA二级结构分析及与杀菌剂戊唑醇分子对接[J].生物化学与生物物理进展,2011,38(8):751-758

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  • 收稿日期:2010-11-28
  • 最后修改日期:2011-03-28
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  • 在线发布日期: 2011-04-02
  • 出版日期: 2011-08-20