Cyclophilin A renders human immunodeficiency virus type 1 sensitive to Old World monkey but not human TRIM5 alpha antiviral activity.

Journal of Virology
Zuzana KeckesovaGreg J Towers

Abstract

TRIM5alpha is an important mediator of antiretroviral innate immunity influencing species-specific retroviral replication. Here we investigate the role of the peptidyl prolyl isomerase enzyme cyclophilin A in TRIM5alpha antiviral activity. Cyclophilin A is recruited into nascent human immunodeficiency virus type 1 (HIV-1) virions as well as incoming HIV-1 capsids, where it isomerizes an exposed proline residue. Here we show that cyclophilin A renders HIV-1 sensitive to restriction by TRIM5alpha in cells from Old World monkeys, African green monkey and rhesus macaque. Inhibition of cyclophilin A activity with cyclosporine A, or reducing cyclophilin A expression with small interfering RNA, rescues TRIM5alpha-restricted HIV-1 infectivity. The effect of cyclosporine A on HIV-1 infectivity is dependent on TRIM5alpha expression, and expression of simian TRIM5alpha in permissive feline cells renders them able to restrict HIV-1 in a cyclosporine A-sensitive way. We use an HIV-1 cyclophilin A binding mutant (CA G89V) to show that cyclophilin A has different roles in restriction by Old World monkey TRIM5alpha and owl monkey TRIM-Cyp. TRIM-Cyp, but not TRIM5alpha, recruits its tripartite motif to HIV-1 capsid via cyclophilin A and, theref...Continue Reading

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