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Title: An ultralong CDRH2 in HCV neutralizing antibody demonstrates structural plasticity of antibodies against E2 glycoprotein

Journal Article · · eLife
DOI:https://doi.org/10.7554/elife.53169· OSTI ID:1628916
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [3]; ORCiD logo [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology and Biological Engineering
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology and Biological Engineering; Johns Hopkins Univ., Baltimore, MD (United States). School of Medicine. Dept. of Medicine
  3. Johns Hopkins Univ., Baltimore, MD (United States). School of Medicine. Dept. of Medicine

A vaccine protective against diverse HCV variants is needed to control the HCV epidemic. Structures of E2 complexes with front layer-specific broadly neutralizing antibodies (bNAbs) isolated from HCV-infected individuals, revealed a disulfide bond-containing CDRH3 that adopts straight (individuals who clear infection) or bent (individuals with chronic infection) conformation. To investigate whether a straight versus bent disulfide bond-containing CDRH3 is specific to particular HCV-infected individuals, we solved a crystal structure of the HCV E2 ectodomain in complex with AR3X, a bNAb with an unusually long CDRH2 that was isolated from the chronically-infected individual from whom the bent CDRH3 bNAbs were derived. The structure revealed that AR3X utilizes both its ultralong CDRH2 and a disulfide motif-containing straight CDRH3 to recognize the E2 front layer. These results demonstrate that both the straight and bent CDRH3 classes of HCV bNAb can be elicited in a single individual, revealing a structural plasticity of VH1-69-derived bNAbs.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1628916
Journal Information:
eLife, Vol. 9; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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