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. 1995 Jan 17;92(2):349–353. doi: 10.1073/pnas.92.2.349

Human immunodeficiency virus type 1 Nef and p56lck protein-tyrosine kinase interact with a common element in CD4 cytoplasmic tail.

S Salghetti 1, R Mariani 1, J Skowronski 1
PMCID: PMC42737  PMID: 7831289

Abstract

The human immunodeficiency virus type 1 nef gene induces endocytosis of CD4 antigen and disrupts the association between CD4 and p56lck protein-tyrosine kinase (EC 2.7.1.112). We demonstrate that in T cells these effects of the viral protein require a cluster of hydrophobic amino acids in a membrane-proximal region of the CD4 cytoplasmic tail; other amino acids in the C-terminal segment of CD4 cytoplasmic tail also contribute to the interaction. Mutations in CD4 that prevent down-modulation by Nef also decrease CD4 association with p56lck and prevent Nef-induced disruption of CD4-p56lck complexes. Together, the overlap in CD4 sequences required for interaction with Nef and p56lck and the tight correlation between Nef-induced CD4 down-modulation and disruption of CD4-p56lck association suggest that Nef, or cellular factors recruited by Nef, interact with this segment of CD4 to displace p56lck from the complex and induce CD4 endocytosis.

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Selected References

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