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Functional studies of HIV-1 envelope glycoproteins (Envs) commonly include the generation of pseudoviruses, which are produced by co-transfection of rev–vpu–env cassettes with an env-deficient provirus. Here, we describe six Env constructs from transmitted/founder HIV-1 that were defective in the pseudotyping assay, although two produced infectious virions when expressed from their cognate proviruses...
It is now well established that the clade of simian immunodeficiency viruses (SIVs) infecting west central African chimpanzees (Pan troglodytes troglodytes) and western gorillas (Gorilla gorilla gorilla) comprises the progenitors of human immunodeficiency virus type 1 (HIV-1). In this study, we have greatly expanded our previous molecular epidemiological survey of SIVcpz in wild chimpanzees in Cameroon...
HIV Nef protein downregulates the surface expression of CD4 on T-cells but its mechanism of activity is unknown. We have analyzed the relevance of different portions of the CD4 molecule with respect to the activity of Nef. Upon transfection of Jurkat T-cells that express Nef or do not express Nef with constructs that include different domains of the CD4 molecule, we demonstrated that Nef downregulation...
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