Virus-Specific Effects of TRIM5rh RING Domain Functions on Restriction of Retroviruses

The tripartite motif protein TRIM5 restricts particular retrovirus infections by binding to the incoming capsid and inhibiting the early stage of virus infection. The TRIM5 RING domain exhibits E3 ubiquitin ligase activity and assists the higher-order association of TRIM5 dimers, which promotes capsid binding. We characterized a panel of RING domainmutants of the rhe-sus monkey TRIM5 (TRIM5rh) protein. The RING domain function that significantly contributed to retroviral restriction depended upon the restricted virus. The E3 ubiquitin ligase activity of the RING domain contributes to the potency of HIV-1 restriction. Nonetheless, TRIM5rh mutants without detectable E3 ubiquitin ligase activity still blocked reverse transcription and inhibited HIV-1 infection at a moderate level. When TRIM5rh capsid binding was weakened by substitution with a less effi-cient B30.2/SPRY domain, the promotion of higher-order association by the RING domain was more important to HIV-1 re-striction than its E3 ubiquitin ligase activity. For the restriction of N-tropic murine leukemia virus (N-MLV) and equine infec-tious anemia virus (EIAV) infection, promotion of higher-order association represented the major contribution of the RING domain. Thus, both identity of the target virus and the B30.2/SPRY domain-mediated affinity for the viral capsid determine the relative contribution of the two known RING domain functions to TRIM5 restriction of retrovirus infection. The replication of human immunodeficiency virus type 1(HIV-1) is potently blocked inOldWorldmonkeys at an earl