Buck TK, Enriquez AS, Schendel SL, Zandonatti MA, Harkins SS, Li H, Moon-Walker A, Robinson JE, Branco LM, Garry RF, Saphire EO, Hastie KM. Neutralizing Antibodies against Lassa Virus Lineage I.
mBio 2022;:e0127822. [PMID:
35730904 DOI:
10.1128/mbio.01278-22]
[Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Lassa virus (LASV) is the causative agent of the deadly Lassa fever (LF). Seven distinct LASV lineages circulate through western Africa, among which lineage I (LI), the first to be identified, is particularly resistant to antibody neutralization. Lineage I LASV evades neutralization by half of known antibodies in the GPC-A antibody competition group and all but one of the antibodies in the GPC-B competition group. Here, we solve two cryo-electron microscopy (cryo-EM) structures of LI GP in complex with a GPC-A and a GPC-B antibody. We used complementary structural and biochemical techniques to identify single-amino-acid substitutions in LI that are responsible for immune evasion by each antibody group. Further, we show that LI infection is more dependent on the endosomal receptor lysosome-associated membrane protein 1 (LAMP1) for viral entry relative to LIV. In the absence of LAMP1, LI requires a more acidic fusion pH to initiate membrane fusion with the host cell relative to LIV.
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