期刊
CELL HOST & MICROBE
卷 24, 期 5, 页码 703-+出版社
CELL PRESS
DOI: 10.1016/j.chom.2018.10.009
关键词
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资金
- National Institutes of Health [R01 AI127469, U19 AI088791]
- Gordon and Betty Moore Foundation
- Cancer Research Institute
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357, DE-AC02-76SF00515]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- DOE Office of Biological and Environmental Research
- NIHGMS [P41GM103393]
Hepatitis C virus (HCV) vaccine efforts are hampered by the extensive genetic diversity of HCV envelope glycoproteins E1 and E2. Structures of broadly neutralizing antibodies (bNAbs) (e.g., HEPC3, HEPC74) isolated from individuals who spontaneously cleared HCV infection facilitate immunogen design to elicit antibodies against multiple HCV variants. However, challenges in expressing HCV glycoproteins previously limited bNAb-HCV structures to complexes with truncated E2 cores. Here we describe crystal structures of full-length E2 ectodomain complexes with HEPC3 and HEPC74, revealing lock-and-key antibody-antigen interactions, E2 regions (including a target of immunogen design) that were truncated or disordered in E2 cores, and an antibody CDRH3 disulfide motif that exhibits common interactions with a conserved epitope despite different bNAb-E2 binding orientations. The structures display unusual features relevant to common genetic signatures of HCV bNAbs and demonstrate extraordinary plasticity in antibody-antigen interactions. In addition, E2 variants that bind HEPC3/HEPC74-like germline precursors may represent candidate vaccine immunogens.
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