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• W2037607325 abstract "The vif gene of human immunodeficiency virus type 1 (HIV-1) greatly enhances the infectivity of HIV-1 virions that are released from cells classified as nonpermissive (e.g., lymphocytes, macrophages, and H9 leukemic T cells) but is irrelevant in permissive cells (e.g., HeLa or COS cells). Recently, it was reported that vif expression in nonpermissive cells dramatically increases infectivity not only of HIV-1 but also of other enveloped viruses, including murine leukemia viruses (MLVs). This was surprising in part because MLVs and other murine retroviruses lack vif genes yet replicate efficiently in T lymphocytes. To investigate these issues, we first developed improved methods for producing substantial quantities of HIV-1 virions with vif deletions from healthy H9 cells. These virions had approximately the same amounts of major core proteins and envelope glycoproteins as the control wild-type virions but were only approximately 1% as infectious. We then produced H9 cells that contained wild-type or vif deletion HIV-gpt proviruses, which lack a functional env gene. After superinfection with either xenotropic or amphotropic MLVs, these cells released HIV-gpt virions pseudotyped with an MLV envelope plus replication-competent MLV. Interestingly, the pseudotyped HIV-gpt (vif deletion) virions were noninfectious, whereas the MLV virions simultaneously released from the same H9 cells were fully infectious. These results strongly suggest that the Vif protein functions in a manner that is both cell specific and at least substantially specific for HIV-1 and related lentiviruses. In addition, these results confirm that vif deletion HIV-1 virions from nonpermissive cells are blocked at a postpenetration stage of the infection pathway." @default.
• W2037607325 created "2016-06-24" @default.
• W2037607325 creator A5071152949 @default.
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• W2037607325 date "2000-07-01" @default.
• W2037607325 modified "2023-09-27" @default.
• W2037607325 title "Cellular and Viral Specificities of Human Immunodeficiency Virus Type 1 Vif Protein" @default.
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• W2037607325 doi "https://doi.org/10.1128/jvi.74.13.5982-5987.2000" @default.
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