3FOA: Crystal structure of the bacteriophage T4 tail sheath protein, deletion mutant gp18M

The contractile tail of bacteriophage T4 is a molecular machine that facilitates very high viral infection efficiency. Its major component is a tail sheath, which contracts during infection to less than half of its initial length. The sheath consists of 138 copies of the tail sheath protein, gene product (gp) 18, which surrounds the central non-contractile tail tube. The contraction of the sheath drives the tail tube through the outer membrane, creating a channel for the viral genome delivery. A crystal structure of about three quarters of gp18 has been determined and was fitted into cryo-electron microscopy reconstructions of the tail sheath before and after contraction. It was shown that during contraction, gp18 subunits slide over each other with no apparent change in their structure.
PDB ID: 3FOADownload
MMDB ID: 70144
PDB Deposition Date: 2008/12/29
Updated in MMDB: 2017/11
Experimental Method:
x-ray diffraction
Resolution: 3.5  Å
Source Organism:
Similar Structures:
Biological Unit for 3FOA: monomeric; determined by author and by software (PISA)
Molecular Components in 3FOA
Label Count Molecule
Protein (1 molecule)
Tail Sheath Protein Gp18(Gene symbol: 18)
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB