Complementary DNA of partial HCV NS2 NS3 protein gene which encodes viral Zn 2+ dependent metalloprotease and serine protease was amplified by RT nested PCR from serum of a Chinese patient with chronic hepatitis C.The...Complementary DNA of partial HCV NS2 NS3 protein gene which encodes viral Zn 2+ dependent metalloprotease and serine protease was amplified by RT nested PCR from serum of a Chinese patient with chronic hepatitis C.The product was digested with Eco R Ⅰ/ Xba Ⅰ and cloned into pcDNA3.The nucleotide sequence was determined.Comparison of NS2 NS3 with the reported typical isolates HCV 1,HCV J,HC C2,HCV J6,HCV J8 showed as 73.72%,90.20%,91.02%,64.56%,63.37% identity in nucleotide sequence and 83.24%,92.09%,93.13%, 70.88% ,67.86% identity in amino acid sequence respectively, so the isolate could be classified as HCV genotype Ⅱ. This gene fragment was cloned into pBV220 to construct recombinant expression vector pBV220 NS2 3.It was expressed efficiently in E.coli . The cloning and expression of HCV NS2 NS3 may contribute to the investigation of the relation between structure and function of viral encoded protease.展开更多
对大理地区2014年流行的丙型肝炎病毒(Hepatitis C virus,HCV)的非结构蛋白5(Nonstructural protein 5,NS5)基因序列进行分析研究,以了解云南省大理地区流行的HCV基因型或基因亚型。2014年1~10月在大理州人民医院收集临床诊断丙型肝炎...对大理地区2014年流行的丙型肝炎病毒(Hepatitis C virus,HCV)的非结构蛋白5(Nonstructural protein 5,NS5)基因序列进行分析研究,以了解云南省大理地区流行的HCV基因型或基因亚型。2014年1~10月在大理州人民医院收集临床诊断丙型肝炎病人血清,共收集到血清48份;对这些标本进行病毒核酸提取和反转录合成cDNA,采用HCV NS5基因特异引物进行RT-PCR扩增,27份标本扩增阳性,序列分析结果显示:5株与基因3a型HCV位于同一进化簇中,核苷酸同源性在90.8%~98.3%之间;14株与基因3b型位于同一进化簇中,核苷酸同源性在87.5%~98.6%之间;5株与基因1b型HCV位于同一进化簇中,核苷酸同源性在91%~97.7%之间;3株与基因6n型位于同一进化簇中,核苷酸同源性在92.8%~96.5%之间,表明本次分离到的27株HCV病毒中,5株属于3a型,14株属于3b型,5株属于1b型,3株属于6n型等3个基因型4个基因亚型。以上研究提示大理地区至少存在1b、3a、3b和6n基因亚型HCV流行,但以基因3型(3a、3b)为主要流行HCV基因型或基因亚型。展开更多
文摘Complementary DNA of partial HCV NS2 NS3 protein gene which encodes viral Zn 2+ dependent metalloprotease and serine protease was amplified by RT nested PCR from serum of a Chinese patient with chronic hepatitis C.The product was digested with Eco R Ⅰ/ Xba Ⅰ and cloned into pcDNA3.The nucleotide sequence was determined.Comparison of NS2 NS3 with the reported typical isolates HCV 1,HCV J,HC C2,HCV J6,HCV J8 showed as 73.72%,90.20%,91.02%,64.56%,63.37% identity in nucleotide sequence and 83.24%,92.09%,93.13%, 70.88% ,67.86% identity in amino acid sequence respectively, so the isolate could be classified as HCV genotype Ⅱ. This gene fragment was cloned into pBV220 to construct recombinant expression vector pBV220 NS2 3.It was expressed efficiently in E.coli . The cloning and expression of HCV NS2 NS3 may contribute to the investigation of the relation between structure and function of viral encoded protease.
文摘对大理地区2014年流行的丙型肝炎病毒(Hepatitis C virus,HCV)的非结构蛋白5(Nonstructural protein 5,NS5)基因序列进行分析研究,以了解云南省大理地区流行的HCV基因型或基因亚型。2014年1~10月在大理州人民医院收集临床诊断丙型肝炎病人血清,共收集到血清48份;对这些标本进行病毒核酸提取和反转录合成cDNA,采用HCV NS5基因特异引物进行RT-PCR扩增,27份标本扩增阳性,序列分析结果显示:5株与基因3a型HCV位于同一进化簇中,核苷酸同源性在90.8%~98.3%之间;14株与基因3b型位于同一进化簇中,核苷酸同源性在87.5%~98.6%之间;5株与基因1b型HCV位于同一进化簇中,核苷酸同源性在91%~97.7%之间;3株与基因6n型位于同一进化簇中,核苷酸同源性在92.8%~96.5%之间,表明本次分离到的27株HCV病毒中,5株属于3a型,14株属于3b型,5株属于1b型,3株属于6n型等3个基因型4个基因亚型。以上研究提示大理地区至少存在1b、3a、3b和6n基因亚型HCV流行,但以基因3型(3a、3b)为主要流行HCV基因型或基因亚型。