7uov
From Proteopedia
Native Lassa glycoprotein in complex with neutralizing antibodies 12.1F and 37.2D
Structural highlights
FunctionGLYC_LASSJ Stable signal peptide (SSP) is cleaved but is apparently retained as the third component of the GP complex. The SSP is required for efficient glycoprotein expression, post-translational cleavage of GP1 and GP2, glycoprotein transport to the cell plasma membrane, formation of infectious virus particles, and acid pH-dependent glycoprotein-mediated cell fusion. The GP complex interacts with host glycosylated LAMP1 to mediate efficient infection.[1] Glycoprotein G1 mediates virus attachment to host receptor alpha-dystroglycan DAG1. This attachment induces virion internalization predominantly through clathrin- and caveolin-independent endocytosis. Glycoprotein G2 is a class I viral fusion protein, that directs fusion of viral and host endosomal membranes, leading to delivery of the nucleocapsid into the cytoplasm. Membrane fusion is mediated by irreversable conformational changes induced upon acidification in the endosome (By similarity). Publication Abstract from PubMedDeveloping potent therapeutics and effective vaccines are the ultimate goals in controlling infectious diseases. Lassa virus (LASV), the causative pathogen of Lassa fever (LF), infects hundreds of thousands annually, but effective antivirals or vaccines against LASV infection are still lacking. Furthermore, neutralizing antibodies against LASV are rare. Here, we describe biochemical analyses and high-resolution cryo-electron microscopy structures of a therapeutic cocktail of three broadly protective antibodies that target the LASV glycoprotein complex (GPC), previously identified from survivors of multiple LASV infections. Structural and mechanistic analyses reveal compatible neutralizing epitopes and complementary neutralization mechanisms that offer high potency, broad range, and resistance to escape. These antibodies either circumvent or exploit specific glycans comprising the extensive glycan shield of GPC. Further, they require mammalian glycosylation, native GPC cleavage, and proper GPC trimerization. These findings guided engineering of a next-generation GPC antigen suitable for future neutralizing antibody and vaccine discovery. Together, these results explain protective mechanisms of rare, broad, and potent antibodies and identify a strategy for the rational design of therapeutic modalities against LF and related infectious diseases. A cocktail of protective antibodies subverts the dense glycan shield of Lassa virus.,Li H, Buck T, Zandonatti M, Yin J, Moon-Walker A, Fang J, Koval A, Heinrich ML, Rowland MM, Diaz Avalos R, Schendel SL, Parekh D, Zyla D, Enriquez A, Harkins S, Sullivan B, Smith V, Chukwudozie O, Watanabe R, Robinson JE, Garry RF, Branco LM, Hastie KM, Saphire EO Sci Transl Med. 2022 Oct 26;14(668):eabq0991. doi: 10.1126/scitranslmed.abq0991. , Epub 2022 Oct 26. PMID:36288283[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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