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CD4 down-regulation by human immunodeficiency virus type 1 (HIV-1) Nef protein is a key function for virus virulence. This activity may be mediated by a direct Nef-CD4 interaction. We investigated the formation, in situ, of such a complex between proteins using bioluminescence resonance energy transfer technology and co-immunoprecipitations. Our data clearly demonstrate that Nef and CD4 interact in intact human cells. Moreover, our results clearly indicate that the dileucine motif of the CD4 cytoplasmic domain, critical for the Nef-induced CD4 down-regulation, is not implicated in the Nef/CD4 complex formation in the cellular context.

journal of virology

Detection of Human Immunodeficiency Virus Type 1 Nef and CD4 Physical Interaction in Living Human Cells by Using Bioluminescence Resonance Energy Transfer