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Research Article

Human immunodeficiency virus type 1 Vpu protein regulates the formation of intracellular gp160-CD4 complexes.

R L Willey, F Maldarelli, M A Martin, K Strebel
R L Willey
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F Maldarelli
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M A Martin
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K Strebel
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ABSTRACT

Intracellular transport and processing of the human immunodeficiency virus type 1 (HIV-1) envelope precursor glycoprotein, gp160, proceeds via the endoplasmic reticulum and Golgi complex and involves proteolytic processing of gp160 into the mature virion components, gp120 and gp41. We found that coexpression of gp160 and human CD4 in HeLa cells severely impaired gp120 production due to the formation of intracellular gp160-CD4 complexes. This CD4-mediated inhibition of gp160 processing was alleviated by coexpression of the HIV-1-encoded Vpu protein. The coexpression of Vpu and CD4 in the presence of gp160 resulted in increased degradation of CD4. Although the precise mechanism(s) responsible for the Vpu effect is presently unclear, our findings suggest that Vpu may destabilize intracellular gp160-CD4 complexes.

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Human immunodeficiency virus type 1 Vpu protein regulates the formation of intracellular gp160-CD4 complexes.
R L Willey, F Maldarelli, M A Martin, K Strebel
Journal of Virology Jan 1992, 66 (1) 226-234; DOI:

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Human immunodeficiency virus type 1 Vpu protein regulates the formation of intracellular gp160-CD4 complexes.
R L Willey, F Maldarelli, M A Martin, K Strebel
Journal of Virology Jan 1992, 66 (1) 226-234; DOI:
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