4BMG

Crystal structure of hexameric HBc149 Y132A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.256 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Thermodynamic Origins of Protein Folding, Allostery and Capsid Formation in the Human Hepatitis B Virus Core Protein

Alexander, C.G.Juergens, M.C.Shepherd, D.A.Freund, S.Ashcroft, A.E.Ferguson, N.

(2013) Proc Natl Acad Sci U S A 110: E2782

  • DOI: 10.1073/pnas.1308846110
  • Primary Citation of Related Structures:  
    4BMG

  • PubMed Abstract: 
  • HBc, the capsid-forming "core protein" of human hepatitis B virus (HBV), is a multidomain, α-helical homodimer that aggressively forms human HBV capsids. Structural plasticity has been proposed to be important to the myriad functions HBc mediates dur ...

    HBc, the capsid-forming "core protein" of human hepatitis B virus (HBV), is a multidomain, α-helical homodimer that aggressively forms human HBV capsids. Structural plasticity has been proposed to be important to the myriad functions HBc mediates during viral replication. Here, we report detailed thermodynamic analyses of the folding of the dimeric HBc protomer under conditions that prevented capsid formation. Central to our success was the use of ion mobility spectrometry-mass spectrometry and microscale thermophoresis, which allowed folding mechanisms to be characterized using just micrograms of protein. HBc folds in a three-state transition with a stable, dimeric, α-helical intermediate. Extensive protein engineering showed thermodynamic linkage between different structural domains. Unusual effects associated with mutating some residues suggest structural strain, arising from frustrated contacts, is present in the native dimer. We found evidence of structural gatekeepers that, when mutated, alleviated native strain and prevented (or significantly attenuated) capsid formation by tuning the population of alternative native conformations. This strain is likely an evolved feature that helps HBc access the different structures associated with its diverse essential functions. The subtle balance between native and strained contacts may provide the means to tune conformational properties of HBc by molecular interactions or mutations, thereby conferring allosteric regulation of structure and function. The ability to trap HBc conformers thermodynamically by mutation, and thereby ablate HBV capsid formation, provides proof of principle for designing antivirals that elicit similar effects.


    Organizational Affiliation

    School of Medicine and Medical Science, University College Dublin, Dublin 4, Ireland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CAPSID PROTEINABCDEF154Hepatitis B virusMutation(s): 1 
Find proteins for P03147 (Hepatitis B virus genotype D subtype adw (isolate United Kingdom/adyw/1979))
Explore P03147 
Go to UniProtKB:  P03147
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.256 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.79α = 68.98
b = 67.75β = 70.75
c = 86.61γ = 84.51
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-10
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Database references
  • Version 1.2: 2013-08-07
    Changes: Database references
  • Version 1.3: 2019-03-06
    Changes: Data collection, Experimental preparation, Other