Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Observed: 0.245 

wwPDB Validation 3D Report Full Report

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Host range and variability of calcium binding by surface loops in the capsids of canine and feline parvoviruses.

Simpson, A.A.Chandrasekar, V.Hebert, B.Sullivan, G.M.Rossmann, M.G.Parrish, C.R.

(2000) J Mol Biol 300: 597-610

  • DOI: 10.1006/jmbi.2000.3868
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Canine parvovirus (CPV) emerged in 1978 as a host range variant of feline panleukopenia virus (FPV). This change of host was mediated by the mutation of five residues on the surface of the capsid. CPV and FPV enter cells by endocytosis and can be tak ...

    Canine parvovirus (CPV) emerged in 1978 as a host range variant of feline panleukopenia virus (FPV). This change of host was mediated by the mutation of five residues on the surface of the capsid. CPV and FPV enter cells by endocytosis and can be taken up by many non-permissive cell lines, showing that their host range and tissue specificity are largely determined by events occurring after cell entry. We have determined the structures of a variety of strains of CPV and FPV at various pH values and in the presence or absence of Ca(2+). The largest structural difference was found to occur in a flexible surface loop, consisting of residues 359 to 375 of the capsid protein. This loop binds a divalent calcium ion in FPV and is adjacent to a double Ca(2+)-binding site, both in CPV and FPV. Residues within the loop and those associated with the double Ca(2+)-binding site were found to be essential for virus infectivity. The residues involved in the double Ca(2+)-binding site are conserved only in FPV and CPV. Our results show that the loop conformation and the associated Ca(2+)-binding are influenced by the Ca(2+) concentration, as well as pH. These changes are correlated with the ability of the virus to hemagglutinate erythrocytes. The co-localization of hemagglutinating activity and host range determinants on the virus surface implies that these properties may be functionally linked. We speculate that the flexible loop and surrounding regions are involved in binding an as yet unidentified host molecule and that this interaction influences host range.

    Related Citations: 
    • Structure Determination of Feline Panleukopenia Virus Empty Particles
      Agbandje, M., McKenna, R., Rossmann, M.G., Strassheim, M.L., Parrish, C.R.
      (1993) Protein Sci 16: 155
    • Structural Refinement of the DNA-Containing Capsid of Canine Parvovirus using RSRef, a Resolution-Dependent Stereochemically Restrained Real-Space Refinement Method
      Chapman, M.S., Rossmann, M.G.
      (1996) Acta Crystallogr D Biol Crystallogr 52: 129
    • Structural Analysis of a Mutation in Canine Parvovirus which Controls Antigenicity and Host Range
      Llamas-Saiz, A.L., Agbandje-McKenna, M., Parker, J.S., Wahid, A.T., Parrish, C.R., Rossmann, M.G.
      (1996) Virology 225: 65
    • The Three-Dimensional Structure of Canine Parvovirus and its Functional Implications
      Tsao, J., Chapman, M.S., Agbandje, M., Keller, W., Smith, K., Wu, H., Luo, M., Smith, T.J., Rossmann, M.G., Compans, R.W., Parrish, C.R.
      (1991) Science 251: 1456

    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, IN, 47907-1392, USA.


Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
548Feline panleukopenia virusMutation(s): 0 
Find proteins for P24840 (Feline panleukopenia virus (strain 193))
Go to UniProtKB:  P24840
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on CA

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 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Observed: 0.245 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 266.17α = 90
b = 250.12β = 94.11
c = 379.1γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
TRANSFmodel building
ENVELOPEmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-09
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-30
    Changes: Advisory
  • Version 1.4: 2017-10-04
    Changes: Refinement description