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J. Virol., 06 1996, 3551-3560, Vol 70, No. 6
D Braaten, EK Franke and J Luban
Cyclophilin A (CyPA) is incorporated into human immunodeficiency virus type
1 (HIV-1) virions via contact with the Gag polyprotein. Genetic or
pharmacologic disruption of CyPA incorporation causes a quantitative
reduction in virion infectivity with no discernible effects on virion
assembly or on endogenous reverse transcriptase activity. Instead, the
reduction of virion-associated CyPA is accompanied by a parallel,
quantitative decrease in the initiation of viral DNA synthesis after
infection of T cells. The infectivity of CyPA-deficient virions is not
restored by pseudotyping with Env of amphotropic murine leukemia virus,
demonstrating that CyPA is not required for the HIV-1-Env-CD4 interaction.
These results indicate that CyPA is required for an early step in the HIV-1
life cycle following receptor binding and membrane fusion but preceding
reverse transcription. CyPA is the first cellular protein other than the
cell surface receptor shown to be required for an early event in the life
cycle of a retrovirus.
Copyright © 1996, American Society for Microbiology
Cyclophilin A is required for an early step in the life cycle of human immunodeficiency virus type 1 before the initiation of reverse transcription
Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York 10032, USA.
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