3R0R image
Entry Detail
PDB ID:
3R0R
Keywords:
Title:
The 2.3 A structure of porcine circovirus 2
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2011-03-08
Release Date:
2011-06-15
Method Details:
Experimental Method:
Resolution:
2.35 Å
R-Value Free:
0.25
R-Value Work:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Porcine circovirus 2 (PCV2) capsid protein
Chain IDs:A
Chain Length:226
Number of Molecules:1
Biological Source:Porcine circovirus 2
Ligand Molecules
Primary Citation
The 2.3-angstrom structure of porcine circovirus 2.
J.Virol. 85 7856 7862 (2011)
PMID: 21632760 DOI: 10.1128/JVI.00737-11

Abstact

Porcine circovirus 2 (PCV2) is a T=1 nonenveloped icosahedral virus that has had severe impact on the swine industry. Here we report the crystal structure of an N-terminally truncated PCV2 virus-like particle at 2.3-Å resolution, and the cryo-electron microscopy (cryo-EM) image reconstruction of a full-length PCV2 virus-like particle at 9.6-Å resolution. This is the first atomic structure of a circovirus. The crystal structure revealed that the capsid protein fold is a canonical viral jelly roll. The loops connecting the strands of the jelly roll define the limited features of the surface. Sulfate ions interacting with the surface and electrostatic potential calculations strongly suggest a heparan sulfate binding site that allows PCV2 to gain entry into the cell. The crystal structure also allowed previously determined epitopes of the capsid to be visualized. The cryo-EM image reconstruction showed that the location of the N terminus, absent in the crystal structure, is inside the capsid. As the N terminus was previously shown to be antigenic, it may externalize through viral "breathing."

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Primary Citation of related structures