4DK1

Crystal Structure of MacA-MexA chimeric protein, containing the Pseudomonas aeruginosa MexA alpha-hairpin domain.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.499 Å
  • R-Value Free: 0.368 
  • R-Value Work: 0.314 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Assembly and channel opening of outer membrane protein in tripartite drug efflux pumps of Gram-negative bacteria.

Xu, Y.Moeller, A.Jun, S.Y.Le, M.Yoon, B.Y.Kim, J.S.Lee, K.Ha, N.C.

(2012) J.Biol.Chem. 287: 11740-11750

  • DOI: 10.1074/jbc.M111.329375
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gram-negative bacteria are capable of expelling diverse xenobiotic substances from within the cell by use of three-component efflux pumps in which the energy-activated inner membrane transporter is connected to the outer membrane channel protein via ...

    Gram-negative bacteria are capable of expelling diverse xenobiotic substances from within the cell by use of three-component efflux pumps in which the energy-activated inner membrane transporter is connected to the outer membrane channel protein via the membrane fusion protein. In this work, we describe the crystal structure of the membrane fusion protein MexA from the Pseudomonas aeruginosa MexAB-OprM pump in the hexameric ring arrangement. Electron microscopy study on the chimeric complex of MexA and the outer membrane protein OprM reveals that MexA makes a tip-to-tip interaction with OprM, which suggests a docking model for MexA and OprM. This docking model agrees well with genetic results and depicts detailed interactions. Opening of the OprM channel is accompanied by the simultaneous exposure of a protein structure resembling a six-bladed cogwheel, which intermeshes with the complementary cogwheel structure in the MexA hexamer. Taken together, we suggest an assembly and channel opening model for the MexAB-OprM pump. This study provides a better understanding of multidrug resistance in Gram-negative bacteria.


    Organizational Affiliation

    Department of Manufacturing Pharmacy, College of Pharmacy and Research Institute for Drug Development, Pusan National University, Busan 609-735, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative MacA, Multidrug resistance protein mexA
A, B, C, D
341Aggregatibacter actinomycetemcomitansPseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)
This entity is chimeric
Mutation(s): 0 
Gene Names: macA, mexA
Find proteins for Q2EHL9 (Aggregatibacter actinomycetemcomitans)
Go to UniProtKB:  Q2EHL9
Find proteins for P52477 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  P52477
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.499 Å
  • R-Value Free: 0.368 
  • R-Value Work: 0.314 
  • Space Group: P 3 2 1
Unit Cell:
Length (Å)Angle (°)
a = 151.708α = 90.00
b = 151.708β = 90.00
c = 216.953γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
MOLREPphasing
HKL-2000data collection
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-02-03 
  • Released Date: 2012-03-07 
  • Deposition Author(s): Xu, Y., Ha, N.C.

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2015-12-09
    Type: Database references
  • Version 1.2: 2017-08-23
    Type: Advisory, Refinement description, Source and taxonomy