3V6Z

Crystal Structure of Hepatitis B Virus e-antigen


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.34 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Antigenic switching of hepatitis B virus by alternative dimerization of the capsid protein.

Dimattia, M.A.Watts, N.R.Stahl, S.J.Grimes, J.M.Steven, A.C.Stuart, D.I.Wingfield, P.T.

(2013) Structure 21: 133-142

  • DOI: 10.1016/j.str.2012.10.017
  • Primary Citation of Related Structures:  
    3V6F, 3V6Z

  • PubMed Abstract: 
  • Chronic hepatitis B virus (HBV) infection afflicts millions worldwide with cirrhosis and liver cancer. HBV e-antigen (HBeAg), a clinical marker for disease severity, is a nonparticulate variant of the protein (core antigen, HBcAg) that forms the building-blocks of capsids ...

    Chronic hepatitis B virus (HBV) infection afflicts millions worldwide with cirrhosis and liver cancer. HBV e-antigen (HBeAg), a clinical marker for disease severity, is a nonparticulate variant of the protein (core antigen, HBcAg) that forms the building-blocks of capsids. HBeAg is not required for virion production, but is implicated in establishing immune tolerance and chronic infection. Here, we report the crystal structure of HBeAg, which clarifies how the short N-terminal propeptide of HBeAg induces a radically altered mode of dimerization relative to HBcAg (∼140° rotation), locked into place through formation of intramolecular disulfide bridges. This structural switch precludes capsid assembly and engenders a distinct antigenic repertoire, explaining why the two antigens are cross-reactive at the T cell level (through sequence identity) but not at the B cell level (through conformation). The structure offers insight into how HBeAg may establish immune tolerance for HBcAg while evading its robust immunogenicity.


    Organizational Affiliation

    Protein Expression Laboratory, National Institute of Arthritis and Musculoskeletal and Skin Diseases; National Institutes of Health, Bethesda, MD 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Fab e6 Heavy ChainA, C224Mus musculusMutation(s): 0 
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Fab e6 Light ChainB, D219Mus musculusMutation(s): 0 
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
e-antigenE, F159Hepatitis B virusMutation(s): 5 
Gene Names: preC/CCpreC
Find proteins for Q9QMH8 (Hepatitis B virus)
Explore Q9QMH8 
Go to UniProtKB:  Q9QMH8
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.34 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.66α = 96.77
b = 75.76β = 103.81
c = 88.7γ = 116.04
Software Package:
Software NamePurpose
BUSTERrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-06
    Type: Initial release