人CYP2E1基因编码蛋白主要特性与结构的生物信息学分析

Bioinformatic Analysis of the Main Characteristics and Structure of the Gene Encoding CYP2E1 Protein

采用生物信息学方法对人CYP2E1基因编码蛋白质的结构、理化性质、亲疏水性、信号肽、跨膜结构域、亚细胞定位、二级结构、三级结构、酶活性中心等进行预测,并对人和其他6物种的CYP2E1编码蛋白序列进行系统进化分析.研究结果表明,人CYP2E1编码493个氨基酸组成多肽,其相对分子质量约为172386.6,等电点理论值为7.04,分子式为C6778H10986N2074O2429S374.该蛋白定位于细胞膜外,属跨膜蛋白,为疏水性不稳定蛋白;该蛋白二级结构有6个β折叠、6个α-螺旋、6个跨膜结构区和32个转角,该酶活性中心由Asn202残基、Ser298残基及Phe205残基与铁卟啉环构成,CYP2E1蛋白血红素铁和底物催化位点之间的距离在0.3-0.6 nm之间.

The nucleotide and amino acid sequences of CYP2E1 protein（ Gen Bank accession number：NC000010. 11 and NM000773. 3） from human being have been analyzed and predicted by bioinformatics in the following aspects： physicochemical properties,hydrophilicity and hydrophobicity,the signal peptide,transmembrane topological structure,subcellular localization,protein secondary structure and tertiary structure,the enzyme active center structure,and the composition of homologous protein and phylogenetic relationship of human being and other 6 species. The results show that the CYP2E1 gene encodes a493 amino acid polypeptides with the estimated relative molecular weight 172 386. 6,the theoretical PI of7. 04 and the structural formula of C6778H10986N2074O2429S374;. It is also found that CYP2E1 is a transmembrane protein with hydrophobicity and relatively unstable. There are 6 β fold,6 α-helix,6 transmembrane regions and 32 angles in its secondary structure,and It＇s active center was composed of Asn202 residues,Ser298residues,Phe205 residues and iron porphyrin ring. The distance of its heme and substrate catalytic sites is 0. 3-0. 6 nm.