Crystal structure of a membrane protein from Pseudomonas aeruginosa

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 

Starting Model: experimental
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Crystal structures of OprN and OprJ, outer membrane factors of multidrug tripartite efflux pumps of Pseudomonas aeruginosa.

Yonehara, R.Yamashita, E.Nakagawa, A.

(2016) Proteins 84: 759-769

  • DOI: https://doi.org/10.1002/prot.25022
  • Primary Citation of Related Structures:  
    5AZO, 5AZP, 5AZS

  • PubMed Abstract: 

    The genome of Pseudomonas aeruginosa encodes tripartite efflux pumps that extrude functionally and structurally dissimilar antibiotics from the bacterial cell. MexAB-OprM, MexCD-OprJ, MexEF-OprN, and MexXY-OprM are the main tripartite efflux pumps responsible for multidrug resistance in P. aeruginosa. The outer membrane factors OprN, OprJ, and OprM are essential components of functional tripartite efflux pumps. To elucidate the structural basis of multidrug resistance, we determined the crystal structures of OprN and OprJ. These structures revealed several features, including tri-acylation of the N-terminal cysteine, a small pore in the β-barrel domain, and a tightly sealed gate in the α-barrel domain. Despite the overall similarity of OprN, OprJ, and OprM, a comparison of their structures and electrostatic distributions revealed subtle differences at the periplasmic end of the α-barrel domain. These results suggested that the overall structures of these outer membrane factors are specifically optimized for particular tripartite efflux pumps. Proteins 2016; 84:759-769. © 2016 Wiley Periodicals, Inc.

  • Organizational Affiliation

    Institute for Protein Research, Osaka University, Suita, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Multidrug efflux outer membrane protein OprN455Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: oprNPA2495
Membrane Entity: Yes 
Find proteins for Q9I0Y7 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I0Y7 
Go to UniProtKB:  Q9I0Y7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I0Y7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.501α = 90
b = 76.501β = 90
c = 191.833γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-08
    Type: Initial release
  • Version 1.1: 2020-02-26
    Changes: Data collection, Database references, Derived calculations
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description, Structure summary