Abstract
The cells of most Old World monkey species exhibit early, postentry restrictions on infection by human immunodeficiency virus type 1 (HIV-1) but not by simian immunodeficiency virus of macaques (SIV(mac)). Conversely, SIV(mac), but not HIV-1, infection is blocked in most New World monkey cells. By using chimeric HIV-1/SIV(mac) viruses capable of a single round of infection, we demonstrated that a major viral determinant of this restriction is the capsid (CA) protein. The efficiency of early events following HIV-1 and SIV(mac) entry is apparently determined by the interaction of the incoming viral CA and species-specific host factors.
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