Author: ["Ryuta Sakuma","Josh A Noser","Seiga Ohmine","Yasuhiro Ikeda"]
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Abstract
Mammalian cells have developed diverse strategies to restrict retroviral infection1,2,3,4,5. Retroviruses have therefore evolved to counteract such restriction factors, in order to colonize their hosts4,6. Tripartite motif-containing 5 isoform-α (TRIM5α) protein from rhesus monkey (TRIM5αrh) restricts human immunodeficiency virus type 1 (HIV-1) infection at a postentry, preintegration stage in the viral life cycle, by recognizing the incoming capsid and promoting its premature disassembly7,8. TRIM5α comprises an RBCC (RING, B-box 2 and coiled-coil motifs) domain and a B30.2(SPRY) domain. Sequences in the B30.2(SPRY) domain dictate the potency and specificity of the restriction8,9,10,11. As TRIM5αrh targets incoming mature HIV-1 capsid, but not precursor Gag12, it was assumed that TRIM5αrh did not affect HIV-1 production. Here we provide evidence that TRIM5αrh, but not its human ortholog (TRIM5αhu), blocks HIV-1 production through rapid degradation of HIV-1 Gag polyproteins. The specificity for this restriction is determined by sequences in the RBCC domain. Our observations suggest that TRIM5αrh interacts with HIV-1 Gag during or before Gag assembly through a mechanism distinct from the well-characterized postentry restriction. This finding demonstrates a cellular factor blocking HIV-1 production by actively degrading a viral protein. Further understanding of this previously unknown restriction mechanism may reveal new targets for future anti–HIV-1 therapy.
Cite this article
Sakuma, R., Noser, J., Ohmine, S. et al. Rhesus monkey TRIM5α restricts HIV-1 production through rapid degradation of viral Gag polyproteins. Nat Med 13, 631–635 (2007). https://doi.org/10.1038/nm1562