Crystal structure of the C-terminal domain of the Rous Sarcoma Virus capsid protein: Mutant A184C

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.188 

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This is version 1.4 of the entry. See complete history


Proton-linked dimerization of a retroviral capsid protein initiates capsid assembly

Bailey, G.D.Hyun, J.K.Mitra, A.K.Kingston, R.L.

(2009) Structure 17: 737-748

  • DOI: https://doi.org/10.1016/j.str.2009.03.010
  • Primary Citation of Related Structures:  
    3G0V, 3G1G, 3G1I, 3G21, 3G26, 3G28, 3G29

  • PubMed Abstract: 

    In mature retroviral particles, the capsid protein (CA) forms a shell encasing the viral replication complex. Human immunodeficiency virus (HIV) CA dimerizes in solution, through its C-terminal domain (CTD), and this interaction is important for capsid assembly. In contrast, other retroviral capsid proteins, including that of Rous sarcoma virus (RSV), do not dimerize with measurable affinity. Here we show, using X-ray crystallography and other biophysical methods, that acidification causes RSV CA to dimerize in a fashion analogous to HIV CA, and that this drives capsid assembly in vitro. A pair of aspartic acid residues, located within the CTD dimer interface, explains why dimerization is linked to proton binding. Our results show that despite overarching structural similarities, the intermolecular forces responsible for forming and stabilizing the retroviral capsid differ markedly across retroviral genera. Our data further suggest that proton binding may regulate RSV capsid assembly, or modulate stability of the assembled capsid.

  • Organizational Affiliation

    School of Biological Sciences, University of Auckland, Auckland, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gag polyprotein77Rous sarcoma virus - Prague CMutation(s): 1 
Gene Names: gag
EC: 3.4.23
Find proteins for P03322 (Rous sarcoma virus subgroup C (strain Prague))
Explore P03322 
Go to UniProtKB:  P03322
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03322
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MLA

Download Ideal Coordinates CCD File 
C3 H4 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.188 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.243α = 90
b = 32.243β = 90
c = 113.993γ = 120
Software Package:
Software NamePurpose
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2015-04-29
    Changes: Non-polymer description
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-11-01
    Changes: Data collection, Refinement description