Crystal structure of the N-terminal beta-barrel domain of Pseudomonas aeruginosa OprF

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Small-Molecule Transport by CarO, an Abundant Eight-Stranded beta-Barrel Outer Membrane Protein from Acinetobacter baumannii.

Zahn, M.D'Agostino, T.Eren, E.Basle, A.Ceccarelli, M.van den Berg, B.

(2015) J Mol Biol 427: 2329-2339

  • DOI: https://doi.org/10.1016/j.jmb.2015.03.016
  • Primary Citation of Related Structures:  
    4RL9, 4RLB, 4RLC

  • PubMed Abstract: 

    Outer membrane (OM) β-barrel proteins composed of 12-18 β-strands mediate cellular entry of small molecules in Gram-negative bacteria. Small OM proteins with barrels of 10 strands or less are not known to transport small molecules. CarO (carbapenem-associated outer membrane protein) from Acinetobacter baumannii is a small OM protein that has been implicated in the uptake of ornithine and carbapenem antibiotics. Here we report crystal structures of three isoforms of CarO. The structures are very similar and show a monomeric eight-stranded barrel lacking an open channel. CarO has a substantial extracellular domain resembling a glove that contains all the divergent residues between the different isoforms. Liposome swelling experiments demonstrate that full-length CarO and a "loop-less" truncation mutant mediate small-molecule uptake at low levels but that they are unlikely to mediate passage of carbapenem antibiotics. These results are confirmed by biased molecular dynamics simulations that allowed us to quantitatively model the transport of selected small molecules.

  • Organizational Affiliation

    Institute for Cellular and Molecular Biosciences, The Medical School, Newcastle University, Newcastle upon Tyne, Tyne and Wear NE2 4HH, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane porin F175Pseudomonas aeruginosaMutation(s): 0 
Gene Names: oprFPA1777
Membrane Entity: Yes 
Find proteins for P13794 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P13794 
Go to UniProtKB:  P13794
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13794
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.009α = 90
b = 26.779β = 95.79
c = 54.892γ = 90
Software Package:
Software NamePurpose
GDAdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-22
    Type: Initial release
  • Version 1.1: 2015-06-24
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations