5up4

Structure of the HIV-1 Capsid Protein and spacer peptide 1 by Cryo-EMStructure of the HIV-1 Capsid Protein and spacer peptide 1 by Cryo-EM

5up4, resolution 9.00Å Show:Asymmetric Unit Biological Assembly Structural highlights 5up4 is a 18 chain structure with sequence from 9hiv1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: gag (9HIV1) Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Maturation of HIV-1 particles encompasses a complex morphological transformation of Gag via an orchestrated series of proteolytic cleavage events. A longstanding question concerns the structure of the C-terminal region of CA and the peptide SP1 (CA-SP1), which represents an intermediate during maturation of the HIV-1 virus. By integrating NMR, cryo-EM, and molecular dynamics simulations, we show that in CA-SP1 tubes assembled in vitro, which represent the features of an intermediate assembly state during maturation, the SP1 peptide exists in a dynamic helix-coil equilibrium, and that the addition of the maturation inhibitors Bevirimat and DFH-055 causes stabilization of a helical form of SP1. Moreover, the maturation-arresting SP1 mutation T8I also induces helical structure in SP1 and further global dynamical and conformational changes in CA. Overall, our results show that dynamics of CA and SP1 are critical for orderly HIV-1 maturation and that small molecules can inhibit maturation by perturbing molecular motions. Quenching protein dynamics interferes with HIV capsid maturation.,Wang M, Quinn CM, Perilla JR, Zhang H, Shirra R Jr, Hou G, Byeon IJ, Suiter CL, Ablan S, Urano E, Nitz TJ, Aiken C, Freed EO, Zhang P, Schulten K, Gronenborn AM, Polenova T Nat Commun. 2017 Nov 24;8(1):1779. doi: 10.1038/s41467-017-01856-y. PMID:29176596 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.