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Comparative Study
. 1994 Mar 11;76(5):853-64.
doi: 10.1016/0092-8674(94)90360-3.

Nef induces CD4 endocytosis: requirement for a critical dileucine motif in the membrane-proximal CD4 cytoplasmic domain

C Aiken  1 , J Konner, N R Landau, M E Lenburg, D Trono
Affiliations
Comparative Study

Nef induces CD4 endocytosis: requirement for a critical dileucine motif in the membrane-proximal CD4 cytoplasmic domain

C Aiken et al. Cell. .

Abstract

CD4 is crucial for antigen-driven helper T cell signaling and is used as receptor by the human immunodeficiency virus (HIV). The HIV early protein Nef causes a loss of CD4 from cell surfaces through a previously undefined posttranscriptional mechanism. Here, we demonstrate that Nef acts by inducing CD4 endocytosis, resulting in its degradation in lysosomes. CD4 down-regulation is strongly enhanced by the association of Nef with cell membranes through myristoylation. The study of chimeric molecules reveals that 20 membrane-proximal residues of the CD4 cytoplasmic domain are sufficient to confer Nef sensitivity. Within this region, a dileucine motif, reminiscent of an endocytosis and lysosomal targeting signal found in the CD3 gamma and delta chains, is crucial for CD4 response to Nef.

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