6egt
Structure of RVFV envelope protein Gc in postfusion conformation in complex with MES
Structural highlights
FunctionGP_RVFV Structural component of the virion that interacts with glycoprotein C (By similarity). It shields the hydrophobic fusion loops of the glycoprotein C, preventing premature fusion (By similarity). The glycoprotein protrusions are arranged on an icosahedral lattice, with T=12 triangulation (PubMed:19193794, PubMed:23319635). They are able to attach the virion to the host cell receptor CD209/DC-SIGN and to promote fusion of membranes with the late endosome after endocytosis of the virion (By similarity). Plays a role in the packaging of ribonucleoproteins and polymerase during virus assembly (By similarity).[UniProtKB:P09613][UniProtKB:P21401][1] [2] Structural component of the virion that interacts with glycoprotein N (By similarity). Acts as a class II fusion protein that is activated upon acidification and subsequent repositioning of the glycoprotein N (PubMed:23319635, PubMed:29097548). The glycoprotein protrusions are arranged on an icosahedral lattice, with T=12 triangulation (PubMed:19193794, PubMed:23319635). They are able to attach the virion to the host cell receptor CD209/DC-SIGN and to promote fusion of membranes with the late endosome after endocytosis of the virion (By similarity).[UniProtKB:P09613][3] [4] [5] Plays a role for virus dissemination in the mosquito.[UniProtKB:P21401][6] Plays a role for virus dissemination in mosquitoes.[UniProtKB:P21401] Publication Abstract from PubMedThe Rift Valley fever virus (RVFV) is transmitted by infected mosquitoes, causing severe disease in humans and livestock across Africa. We determined the x-ray structure of the RVFV class II fusion protein Gc in its postfusion form and in complex with a glycerophospholipid (GPL) bound in a conserved cavity next to the fusion loop. Site-directed mutagenesis and molecular dynamics simulations further revealed a built-in motif allowing en bloc insertion of the fusion loop into membranes, making few nonpolar side-chain interactions with the aliphatic moiety and multiple polar interactions with lipid head groups upon membrane restructuring. The GPL head-group recognition pocket is conserved in the fusion proteins of other arthropod-borne viruses, such as Zika and chikungunya viruses, which have recently caused major epidemics worldwide. A glycerophospholipid-specific pocket in the RVFV class II fusion protein drives target membrane insertion.,Guardado-Calvo P, Atkovska K, Jeffers SA, Grau N, Backovic M, Perez-Vargas J, de Boer SM, Tortorici MA, Pehau-Arnaudet G, Lepault J, England P, Rottier PJ, Bosch BJ, Hub JS, Rey FA Science. 2017 Nov 3;358(6363):663-667. doi: 10.1126/science.aal2712. PMID:29097548[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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