4BTP image
Entry Detail
PDB ID:
4BTP
Keywords:
Title:
Structure of the capsid protein P1 of the bacteriophage phi8
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-06-18
Release Date:
2013-08-07
Method Details:
Experimental Method:
Resolution:
3.70 Å
R-Value Free:
0.25
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:p1
Chain IDs:A, B, C, D, E, F, G, H, I, J
Chain Length:792
Number of Molecules:10
Biological Source:Pseudomonas phage phi8
Ligand Molecules
Primary Citation
Plate Tectonics of Virus Shell Assembly and Reorganization in Phage Phi8, a Distant Relative of Mammalian Reoviruses
Structure 21 1374 ? (2013)
PMID: 23891291 DOI: 10.1016/J.STR.2013.06.017

Abstact

The hallmark of a virus is its capsid, which harbors the viral genome and is formed from protein subunits, which assemble following precise geometric rules. dsRNA viruses use an unusual protein multiplicity (120 copies) to form their closed capsids. We have determined the atomic structure of the capsid protein (P1) from the dsRNA cystovirus Φ8. In the crystal P1 forms pentamers, very similar in shape to facets of empty procapsids, suggesting an unexpected assembly pathway that proceeds via a pentameric intermediate. Unlike the elongated proteins used by dsRNA mammalian reoviruses, P1 has a compact trapezoid-like shape and a distinct arrangement in the shell, with two near-identical conformers in nonequivalent structural environments. Nevertheless, structural similarity with the analogous protein from the mammalian viruses suggests a common ancestor. The unusual shape of the molecule may facilitate dramatic capsid expansion during phage maturation, allowing P1 to switch interaction interfaces to provide capsid plasticity.

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