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Structure of Hepatitis C Virus Envelope Glycoprotein E1 Antigenic Site 314-324 in Complex with Antibody IGH526.
- Source :
-
Journal of molecular biology [J Mol Biol] 2015 Aug 14; Vol. 427 (16), pp. 2617-28. Date of Electronic Publication: 2015 Jun 30. - Publication Year :
- 2015
-
Abstract
- Hepatitis C virus (HCV) is a positive-strand RNA virus within the Flaviviridae family. The viral "spike" of HCV is formed by two envelope glycoproteins, E1 and E2, which together mediate viral entry by engaging host receptors and undergoing conformational changes to facilitate membrane fusion. While E2 can be readily produced in the absence of E1, E1 cannot be expressed without E2 and few reagents, including monoclonal antibodies (mAbs), are available for study of this essential HCV glycoprotein. A human mAb to E1, IGH526, was previously reported to cross-neutralize different HCV isolates, and therefore, we sought to further characterize the IGH526 neutralizing epitope to obtain information for vaccine design. We found that mAb IGH526 bound to a discontinuous epitope, but with a major component corresponding to E1 residues 314-324. The crystal structure of IGH526 Fab with this E1 glycopeptide at 1.75Å resolution revealed that the antibody binds to one face of an α-helical peptide. Single mutations on the helix substantially lowered IGH526 binding but did not affect neutralization, indicating either that multiple mutations are required or that additional regions are recognized by the antibody in the context of the membrane-associated envelope oligomer. Molecular dynamics simulations indicate that the free peptide is flexible in solution, suggesting that it requires stabilization for use as a candidate vaccine immunogen.<br /> (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Subjects :
- Antibodies, Monoclonal immunology
Antibodies, Neutralizing immunology
Binding Sites, Antibody
Cell Line
Crystallography, X-Ray
Epitope Mapping
Epitopes immunology
HEK293 Cells
Hepacivirus immunology
Humans
Molecular Dynamics Simulation
Epitopes ultrastructure
Hepatitis C Antibodies immunology
Immunoglobulin Fab Fragments immunology
Viral Envelope Proteins immunology
Viral Envelope Proteins ultrastructure
Subjects
Details
- Language :
- English
- ISSN :
- 1089-8638
- Volume :
- 427
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- Journal of molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 26135247
- Full Text :
- https://doi.org/10.1016/j.jmb.2015.06.012