2X27: Crystal structure of the outer membrane protein OprG from Pseudomonas aeruginosa

BACKGROUND: The outer membrane (OM) of Gram-negative bacteria provides a barrier to the passage of hydrophobic and hydrophilic compounds into the cell. The OM has embedded proteins that serve important functions in signal transduction and in the transport of molecules into the periplasm. The OmpW family of OM proteins, of which P. aeruginosa OprG is a member, is widespread in Gram-negative bacteria. The biological functions of OprG and other OmpW family members are still unclear. METHODOLOGY/PRINCIPAL FINDINGS: In order to obtain more information about possible functions of OmpW family members we have solved the X-ray crystal structure of P. aeruginosa OprG at 2.4 A resolution. OprG forms an eight-stranded beta-barrel with a hydrophobic channel that leads from the extracellular surface to a lateral opening in the barrel wall. The OprG barrel is closed off from the periplasm by interacting polar and charged residues on opposite sides of the barrel wall. CONCLUSIONS/SIGNIFICANCE: The crystal structure, together with recent biochemical data, suggests that OprG and other OmpW family members form channels that mediate the diffusion of small hydrophobic molecules across the OM by a lateral diffusion mechanism similar to that of E. coli FadL.
PDB ID: 2X27Download
MMDB ID: 87278
PDB Deposition Date: 2010/1/11
Updated in MMDB: 2010/12
Experimental Method:
x-ray diffraction
Resolution: 2.4  Å
Source Organism:
Similar Structures:
Biological Unit for 2X27: monomeric; determined by software (PISA)
Molecular Components in 2X27
Label Count Molecule
Protein (1 molecule)
Outer Membrane Protein Oprg
Molecule annotation
Chemicals (15 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB