Detection of human immunodeficiency virus type 1 Nef and CD4 physical interaction in living human cells by using bioluminescence resonance energy transfer.
J Virol, 79(13):8629-36.
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 dileucinemotif 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.
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