Structural highlights
FunctionGP_BUNL8 Glycoprotein C and glycoprotein N interact with each other and are present at the surface of the virion. They are able to attach the virion to a cell receptor and to promote fusion of membranes after endocytosis of the virion (By similarity). Publication Abstract from PubMedOrthobunyaviruses (OBVs) form a distinct genus of arthropod-borne bunyaviruses that can cause severe disease upon zoonotic transmission to humans. Antigenic drift or genome segment re-assortment have in the past resulted in new pathogenic OBVs, making them potential candidates for causing emerging zoonoses in the future. Low-resolution electron cryo-tomography studies have shown that OBV particles feature prominent trimeric spikes, but their molecular organization remained unknown. Here we report X-ray crystallography studies of four different OBVs showing that the spikes are formed by an N-terminal extension of the fusion glycoprotein Gc. Using Schmallenberg virus, a recently emerged OBV, we also show that the projecting spike is the major target of the neutralizing antibody response, and provide X-ray structures in complex with two protecting antibodies. We further show that immunization of mice with the spike domains elicits virtually sterilizing immunity, providing fundamental knowledge essential in the preparation for potential newly emerging OBV zoonoses. Orthobunyavirus spike architecture and recognition by neutralizing antibodies.,Hellert J, Aebischer A, Wernike K, Haouz A, Brocchi E, Reiche S, Guardado-Calvo P, Beer M, Rey FA Nat Commun. 2019 Feb 20;10(1):879. doi: 10.1038/s41467-019-08832-8. PMID:30787296[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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