5FGC

Three dimensional structure of broadly neutralizing human anti - Hepatitis C virus (HCV) glycoprotein E2 Fab fragment HC33.8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Antibody Response to Hypervariable Region 1 Interferes with Broadly Neutralizing Antibodies to Hepatitis C Virus.

Keck, Z.Y.Girard-Blanc, C.Wang, W.Lau, P.Zuiani, A.Rey, F.A.Krey, T.Diamond, M.S.Foung, S.K.

(2016) J.Virol. 90: 3112-3122

  • DOI: 10.1128/JVI.02458-15
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hypervariable region 1 (HVR1) (amino acids [aa] 384 to 410) on the E2 glycoprotein of hepatitis C virus contributes to persistent infection by evolving escape mutations that attenuate binding of inhibitory antibodies and by blocking access of broadly ...

    Hypervariable region 1 (HVR1) (amino acids [aa] 384 to 410) on the E2 glycoprotein of hepatitis C virus contributes to persistent infection by evolving escape mutations that attenuate binding of inhibitory antibodies and by blocking access of broadly neutralizing antibodies to their epitopes. A third proposed mechanism of immune antagonism is that poorly neutralizing antibodies binding to HVR1 interfere with binding of other superior neutralizing antibodies. Epitope mapping of human monoclonal antibodies (HMAbs) that bind to an adjacent, conserved domain on E2 encompassing aa 412 to 423 revealed two subsets, designated HC33 HMAbs. While both subsets have contact residues within aa 412 to 423, alanine-scanning mutagenesis suggested that one subset, which includes HC33.8, has an additional contact residue within HVR1. To test for interference of anti-HVR1 antibodies with binding of antibodies to aa 412 to 423 and other E2 determinants recognized by broadly neutralizing HMAbs, two murine MAbs against HVR1 (H77.16) and aa 412 to 423 (H77.39) were studied. As expected, H77.39 inhibited the binding of all HC33 HMAbs. Unexpectedly, H77.16 also inhibited the binding of both subsets of HC33 HMAbs. This inhibition also was observed against other broadly neutralizing HMAbs to epitopes outside aa 412 to 423. Combination antibody neutralization studies by the median-effect analysis method with H77.16 and broadly reactive HMAbs revealed antagonism between these antibodies. Structural studies demonstrated conformational flexibility in this antigenic region, which supports the possibility of anti-HVR1 antibodies hindering the binding of broadly neutralizing MAbs. These findings support the hypothesis that anti-HVR1 antibodies can interfere with a protective humoral response against HCV infection.


    Organizational Affiliation

    Department of Pathology, Stanford University School of Medicine, Stanford, California, USA.,Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, USA.,Institut Pasteur, Unité de Virologie Structurale, Department Virologie, Paris, France CNRS UMR 3569, Paris, France.,Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, USA Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, USA.,Institut Pasteur, Proteopole, Paris, France CNRS UMR 3528, Paris, France.,Department of Pathology, Stanford University School of Medicine, Stanford, California, USA sfoung@stanford.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Genome polyprotein
A
21Hepatitis C virus genotype 1a (isolate H)Mutation(s): 0 
Find proteins for P27958 (Hepatitis C virus genotype 1a (isolate H))
Go to UniProtKB:  P27958
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Anti-HCV E2 Fab HC33.8 light chain
B
216N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Anti-HCV E2 Fab HC33.8 heavy chain
E
269N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.194 
  • Space Group: P 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 66.050α = 90.00
b = 49.570β = 98.50
c = 66.390γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
BUSTERrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
ANRSFrance--

Revision History 

  • Version 1.0: 2016-01-20
    Type: Initial release
  • Version 1.1: 2016-03-09
    Type: Database references