Structural highlights
Publication Abstract from PubMedHIV-1 Rev mediates the nuclear export of unspliced and partially-spliced viral transcripts for the production of progeny genomes and structural proteins. In this process, four (or more) copies of Rev assemble onto a highly-structured 351-nt region in such viral transcripts, the Rev response element (RRE). How this occurs is not known. The Rev assembly domain has a helical-hairpin structure which associates through three (A-A, B-B and C-C) interfaces. The RRE has the topology of an upper-case letter A, with the two known Rev binding sites mapping onto the legs of the A. We have determined a crystal structure for the Rev assembly domain at 2.25A resolution, without resort to either mutations or chaperones. It shows that B-B dimers adopt an arrangement reversed relative to that previously reported, and join through a C-C interface to form tetramers. The new subunit arrangement shows how four Rev molecules can assemble on the two sites on the RRE to form the specificity checkpoint, and how further copies add through A-A interactions. Residues at the C-C interface, specifically the Pro31-Trp45 axis, are a potential target for intervention. A new HIV-1 Rev structure optimizes interaction with target RNA (RRE) for nuclear export.,Watts NR, Eren E, Zhuang X, Wang YX, Steven AC, Wingfield PT J Struct Biol. 2018 Mar 29. pii: S1047-8477(18)30088-1. doi:, 10.1016/j.jsb.2018.03.011. PMID:29605570[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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