2V50

The Missing Part of the Bacterial MexAB-OprM System: Structural determination of the Multidrug Exporter MexB

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Crystal Structure of the Multidrug Exporter Mexb from Pseudomonas Aeruginosa.

Sennhauser, G., Bukowska, M.A., Briand, C., Gruetter, M.G.

(2009) J Mol Biol 389: 134

  • DOI: 10.1016/j.jmb.2009.04.001
  • Primary Citation of Related Structures:  
    2V50

  • PubMed Abstract: 

    • We report here the crystal structure of the Pseudomonas aeruginosa multidrug exporter MexB, an intensively studied member of the resistance-nodulation-cell division family of secondary active transporters, at 3.0 A. MexB forms an asymmetric homotrime ...

    We report here the crystal structure of the Pseudomonas aeruginosa multidrug exporter MexB, an intensively studied member of the resistance-nodulation-cell division family of secondary active transporters, at 3.0 A. MexB forms an asymmetric homotrimer where each subunit adopts a different conformation representing three snapshots of the transport cycle similar to the recently determined structures of its close homologue AcrB from Escherichia coli, so far the sole structurally characterized member of the superfamily. As for AcrB, the conformations of two subunits can be clearly assigned to either the binding step or the extrusion step in the transport process. Unexpectedly, a remarkable conformational shift in the third subunit is observed in MexB, which has potential implications for the assembly of the tripartite MexAB-OprM drug efflux system. Furthermore, an n-dodecyl-d-maltoside molecule was found bound to the internal multidrug-binding cavity, which might indicate that MexB binds and transports detergent molecules as substrates. As the only missing piece of the puzzle in the MexAB-OprM system, the X-ray structure of MexB completes the molecular picture of the major pump mediating intrinsic and acquired multidrug resistance in P. aeruginosa.

    Organizational Affiliation: 

    Department of Biochemistry, University of Zurich, Switzerland.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MULTIDRUG RESISTANCE PROTEIN MEXBA, B, C, D, E, F1052Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: mexB, PA0426
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Multi-Drug Efflux Transporters		Protein: 
MexB bacterial multi-drug efflux transporter
Find proteins for P52002 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P52002 
Go to UniProtKB:  P52002
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT
Download CCD File 
A, B, D, E
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.243 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.05α = 86.99
b = 134.58β = 69.7
c = 151.02γ = 88.16
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-05-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Advisory, Source and taxonomy