4V4K

Bacteriophage P22 Portal Protein bound to middle Tail Factor GP4. This file contain the second biological assembly

This is a non-PDB format compatible entry.

Summary for 4V4K

• Entry DOI: 10.2210/pdb4v4k/pdb
• Related: 3LJ5
• Descriptor: PORTAL PROTEIN, PACKAGED DNA STABILIZATION PROTEIN GP4 (3 entities in total)
• Functional Keywords: portal protein, dna ejection, molecular motor, dna packaging, podoviridae, virus assembly, late protein, viral protein
• Biological source: ENTEROBACTERIA PHAGE P22 (BACTERIOPHAGE P22); More
• Cellular location: Virion : P26744 P26746
• Total number of polymer chains: 48
• Total formula weight: 2114074.22

Authors

Olia, A.S.,Cingolani, G. (deposition date: 2010-04-19, release date: 2014-07-09, Last modification date: 2024-10-30)

Primary citation

Olia, A.S.,Prevelige, P.E.,Johnson, J.E.,Cingolani, G.
Three-dimensional structure of a viral genome-delivery portal vertex.
Nat.Struct.Mol.Biol., 18:597-603, 2011

PubMed Abstract: DNA viruses such as bacteriophages and herpesviruses deliver their genome into and out of the capsid through large proteinaceous assemblies, known as portal proteins. Here, we report two snapshots of the dodecameric portal protein of bacteriophage P22. The 3.25-Å-resolution structure of the portal-protein core bound to 12 copies of gene product 4 (gp4) reveals a ~1.1-MDa assembly formed by 24 proteins. Unexpectedly, a lower-resolution structure of the full-length portal protein unveils the unique topology of the C-terminal domain, which forms a ~200-Å-long α-helical barrel. This domain inserts deeply into the virion and is highly conserved in the Podoviridae family. We propose that the barrel domain facilitates genome spooling onto the interior surface of the capsid during genome packaging and, in analogy to a rifle barrel, increases the accuracy of genome ejection into the host cell.

PubMed: 21499245
DOI: 10.1038/nsmb.2023

Experimental method

X-RAY DIFFRACTION (3.251 Å)