上海HIV-1分離株vif基因變異分析及Vif蛋白功能的實驗研究
[Abstract]:Objective: to understand the structure of vif gene and protein in Shanghai HIV-1 isolate. In vitro recombinant HIV-1Vif protein was used to prepare mouse polyclonal antibody against Vif and to construct Vif lentivirus vector infected cell model to further study the interference of Vif expression with RNAi technique and to demonstrate the feasibility of HIV-1 intervention with Vif. Methods: the vif gene of Shanghai HIV-1 isolate was amplified by RT-PCR method in vitro. The mutation rate of vif gene of Shanghai HIV-1 isolate was analyzed by sequencing and comparing with international standard HIV-1 isolate, and the variation of amino acid was deduced. The prokaryotic expression vector of vif gene pET32b () was further constructed, and the Vif protein was expressed and purified by BL21 star (DE3) (pLysS) cell line). The mouse polyclonal antibody was prepared by immunizing mice with purified Vif protein. The function of recombinant Vif protein and its polyclonal antibody was detected by ELISA assay. HIV-1Vif lentivirus expression vector was constructed to infect HEK293T cells and normal PBMC cells. The expression of vif gene and Vif protein was detected by Real-Time PCR and SDS-PAGE. Results: the data of this study confirmed that the vif gene of Shanghai HIV-1 isolate had a higher mutation rate than that of international standard HIV strain, but there was a relatively conserved base sequence between 150bp~245bp (579bp). The amino acids of Vif protein have a certain variation rule. It is not clear whether these amino acid mutation sites affect the function of Vif, and need to be further studied: in this study, the recombination of HIV-1Vif protein, the expression of HIV-1Vif protein, The polyclonal antibody was successfully prepared, and it was confirmed by experiments that there was no or only a small amount of HIV-1Vif antibody in the serum samples of AIDS patients. The detection value of HIV-1Vif antibody in HIV-1 infected patients could be further studied. In this study, we successfully constructed the human PBMC cell model and HEK293T cell model infected with lentivirus vector expressing Vif protein. Conclusion: based on the importance of HIV-1Vif in the pathogenesis of HIV-1, a new method of gene therapy for HIV infection / AIDS can be found by studying its gene and protein. The sequence of HIV-1vif gene was studied in this study. A relatively conservative sequence was found for the selection of target sequences by RNAi. The Vif mouse polyclonal antibody can be used for the detection of Vif protein, and the Vif interference cell model is constructed, which can be used for further study.
【學位授予單位】:復旦大學
【學位級別】:碩士
【學位授予年份】:2008
【分類號】:R346
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