4IL7 image
Deposition Date 2012-12-29
Release Date 2013-04-03
Last Version Date 2024-02-28
Entry Detail
PDB ID:
4IL7
Keywords:
Title:
Crystal structure of A223 C-terminal domain, a structural protein from sulfolobus turreted icosahedral virus (STIV)
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.40 Å
R-Value Free:
0.16
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative uncharacterized protein
Gene (Uniprot):A223
Mutations:L208M
Chain IDs:A
Chain Length:166
Number of Molecules:1
Biological Source:Sulfolobus turreted icosahedral virus
Primary Citation
Atomic structure of the 75 MDa extremophile Sulfolobus turreted icosahedral virus determined by CryoEM and X-ray crystallography.
Proc.Natl.Acad.Sci.USA 110 5504 5509 (2013)
PMID: 23520050 DOI: 10.1073/pnas.1300601110

Abstact

Sulfolobus turreted icosahedral virus (STIV) was isolated in acidic hot springs where it infects the archeon Sulfolobus solfataricus. We determined the STIV structure using near-atomic resolution electron microscopy and X-ray crystallography allowing tracing of structural polypeptide chains and visualization of transmembrane proteins embedded in the viral membrane. We propose that the vertex complexes orchestrate virion assembly by coordinating interactions of the membrane and various protein components involved. STIV shares the same coat subunit and penton base protein folds as some eukaryotic and bacterial viruses, suggesting that they derive from a common ancestor predating the divergence of the three kingdoms of life. One architectural motif (β-jelly roll fold) forms virtually the entire capsid (distributed in three different gene products), indicating that a single ancestral protein module may have been at the origin of its evolution.

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