Affiliation:
1. Aaron Diamond AIDS Research Center and the Rockefeller University, New York, New York
Abstract
ABSTRACT
TRIM-CypA is an owl monkey-specific variant of the retrovirus restriction factor TRIM5α. Here, we exploit its modular domain organization and cyclosporine sensitivity to probe the kinetics and mechanism of TRIM5-mediated restriction. Time of addition/withdrawal experiments reveal that inhibition of incoming human immunodeficiency virus type 1 capsids by TRIM-CypA occurs within minutes of their delivery to the target cell cytoplasm. However, while TRIM-CypA restriction is partly dependent on a RING domain, restriction occurs independently of the ubiquitin/proteasome system. Moreover, tagged TRIM-CypA proteins can be fully active as restriction factors without forming cytoplasmic bodies.
Publisher
American Society for Microbiology
Subject
Virology,Insect Science,Immunology,Microbiology
Cited by
135 articles.
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