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From Proteopedia
Atomic-Resolution Structure of HIV-1 Capsid Tubes by Magic Angle Spinning NMR
Structural highlights
FunctionGAG_HV1N5 Matrix protein p17 targets Gag and Gag-Pol polyproteins to the plasma membrane via a multipartite membrane binding signal, that includes its myristoylated N-terminus. Also mediates nuclear localization of the preintegration complex. Implicated in the release from host cell mediated by Vpu. Capsid protein p24 forms the conical core of the virus that encapsulates the genomic RNA-nucleocapsid complex. Nucleocapsid protein p7 encapsulates and protects viral dimeric unspliced (genomic) RNA. Binds these RNAs through its zinc fingers. p6-gag plays a role in budding of the assembled particle by interacting with the host class E VPS proteins TSG101 and PDCD6IP/AIP1 (By similarity). Publication Abstract from PubMedHIV-1 capsid plays multiple key roles in viral replication, and inhibition of capsid assembly is an attractive target for therapeutic intervention. Here, we report the atomic-resolution structure of capsid protein (CA) tubes, determined by magic-angle spinning NMR and data-guided molecular dynamics simulations. Functionally important regions, including the NTD beta-hairpin, the cyclophilin A-binding loop, residues in the hexamer central pore, and the NTD-CTD linker region, are well defined. The structure of individual CA chains, their arrangement in the pseudo-hexameric units of the tube and the inter-hexamer interfaces are consistent with those in intact capsids and substantially different from the organization in crystal structures, which feature flat hexamers. The inherent curvature in the CA tubes is controlled by conformational variability of residues in the linker region and of dimer and trimer interfaces. The present structure reveals atomic-level detail in capsid architecture and provides important guidance for the design of novel capsid inhibitors. Atomic-resolution structure of HIV-1 capsid tubes by magic-angle spinning NMR.,Lu M, Russell RW, Bryer AJ, Quinn CM, Hou G, Zhang H, Schwieters CD, Perilla JR, Gronenborn AM, Polenova T Nat Struct Mol Biol. 2020 Sep;27(9):863-869. doi: 10.1038/s41594-020-0489-2. Epub, 2020 Sep 8. PMID:32901160[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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