AIM: To study the epitope distribution of hepatitis G virus (HGV) and to seek for the potential recombinant antigens for the development of HGV diagnostic reagents. METHODS: Fourteen clones encompassing HGV gene fragm...AIM: To study the epitope distribution of hepatitis G virus (HGV) and to seek for the potential recombinant antigens for the development of HGV diagnostic reagents. METHODS: Fourteen clones encompassing HGV gene fragments from core to NS3 and NS5 were constructed using prokaryotic expression vector pRSET and (or) pGEX, and expressed in E.coli. Western blotting and ELISA were used to detect the immunoreactivity of these recombinant proteins. RESULTS: One clone with HGV fragment from core to E1 (G1), one from E2 (G31), three from NS3 (G6, G61, G7), one from NS5B (G821) and one chimeric fragment from NS3 and NS5B (G61-821) could be expressed well and showed obvious immunoreactivity by Western blotting. One clone with HGV framment from NS5B (G82) was also well expressed, but could not show immunoreactivity by Western blotting. No obvious expression was found in the other six clones. All the expressed recombinant proteins were in inclusion body form, except the protein G61 which could be expressed in soluble form. Further purified recombinant proteins G1, G31, G61, G821 and G61-821 were detected in indirected ELISA as coating antigen respectively. Only recombinant G1 could still show immunoreactivity, and the other four recombinant proteins failed to react to the HGV antibody positive sera. Western blotting results indicated that the immunoactivity of these four recombinant proteins were lost during purification. CONCLUSION: Core to E1, E2, NS3 and NS5 fragment of HGV contain antigenic epitopes, which could be produced in prokaryotically expressed recombinant proteins. A high-yield recombinant protein (G1) located in HGV core to E1 could remain its epitope after purification, which showed the potential that G1 could be used as a coating antigen to develop an ELISA kit for HGV specific antibody diagnosis.展开更多
[目的]初步了解我国人类免疫缺陷病毒2型(HIV-2)的感染状况。[方法]用多种HIV抗体确认方法检测来自全国各地的HIV-2可疑血浆/血清样品,用Genelabs HIV Blot2.2WB检测5份已知HIV-2血浆样品。[结果]用Genelabs HIV Blot2.2WB检测54份HIV-...[目的]初步了解我国人类免疫缺陷病毒2型(HIV-2)的感染状况。[方法]用多种HIV抗体确认方法检测来自全国各地的HIV-2可疑血浆/血清样品,用Genelabs HIV Blot2.2WB检测5份已知HIV-2血浆样品。[结果]用Genelabs HIV Blot2.2WB检测54份HIV-2可疑样品,全部呈HIV-1抗体阳性反应且有HIV-2指示带;用HIV-2WB试剂检测,44.4%(24/54)呈HIV-2抗体阳性反应、55.6%(30/54)呈不确定反应;用2种线性免疫试验检测,分别只有3.7%(2/54)和1.9%(1/54)判定为HIV-1/2混合感染,绝大部分仅为HIV-1抗体阳性。对于5份已知HIV-2样品,使用Genelabs HIV Blot2.2WB检测时与HIV-1抗原发生不同程度的交叉反应,但带型明显不同于HIV-1样品。[结论]结果提示我国的HIV-2感染很少见,现有的HIV-2WB不宜用于检测HIV-1抗体呈阳性反应的样品。展开更多
基金Supported by National 863 Project,No.102-07-02-079th Five-Year Sci-Tech Plan,No.96-906A-03-08
文摘AIM: To study the epitope distribution of hepatitis G virus (HGV) and to seek for the potential recombinant antigens for the development of HGV diagnostic reagents. METHODS: Fourteen clones encompassing HGV gene fragments from core to NS3 and NS5 were constructed using prokaryotic expression vector pRSET and (or) pGEX, and expressed in E.coli. Western blotting and ELISA were used to detect the immunoreactivity of these recombinant proteins. RESULTS: One clone with HGV fragment from core to E1 (G1), one from E2 (G31), three from NS3 (G6, G61, G7), one from NS5B (G821) and one chimeric fragment from NS3 and NS5B (G61-821) could be expressed well and showed obvious immunoreactivity by Western blotting. One clone with HGV framment from NS5B (G82) was also well expressed, but could not show immunoreactivity by Western blotting. No obvious expression was found in the other six clones. All the expressed recombinant proteins were in inclusion body form, except the protein G61 which could be expressed in soluble form. Further purified recombinant proteins G1, G31, G61, G821 and G61-821 were detected in indirected ELISA as coating antigen respectively. Only recombinant G1 could still show immunoreactivity, and the other four recombinant proteins failed to react to the HGV antibody positive sera. Western blotting results indicated that the immunoactivity of these four recombinant proteins were lost during purification. CONCLUSION: Core to E1, E2, NS3 and NS5 fragment of HGV contain antigenic epitopes, which could be produced in prokaryotically expressed recombinant proteins. A high-yield recombinant protein (G1) located in HGV core to E1 could remain its epitope after purification, which showed the potential that G1 could be used as a coating antigen to develop an ELISA kit for HGV specific antibody diagnosis.
文摘[目的]初步了解我国人类免疫缺陷病毒2型(HIV-2)的感染状况。[方法]用多种HIV抗体确认方法检测来自全国各地的HIV-2可疑血浆/血清样品,用Genelabs HIV Blot2.2WB检测5份已知HIV-2血浆样品。[结果]用Genelabs HIV Blot2.2WB检测54份HIV-2可疑样品,全部呈HIV-1抗体阳性反应且有HIV-2指示带;用HIV-2WB试剂检测,44.4%(24/54)呈HIV-2抗体阳性反应、55.6%(30/54)呈不确定反应;用2种线性免疫试验检测,分别只有3.7%(2/54)和1.9%(1/54)判定为HIV-1/2混合感染,绝大部分仅为HIV-1抗体阳性。对于5份已知HIV-2样品,使用Genelabs HIV Blot2.2WB检测时与HIV-1抗原发生不同程度的交叉反应,但带型明显不同于HIV-1样品。[结论]结果提示我国的HIV-2感染很少见,现有的HIV-2WB不宜用于检测HIV-1抗体呈阳性反应的样品。
