2F1M

Conformational flexibility in the multidrug efflux system protein AcrA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Conformational Flexibility in the Multidrug Efflux System Protein AcrA.

Mikolosko, J.Bobyk, K.Zgurskaya, H.I.Ghosh, P.

(2006) Structure 14: 577-587

  • DOI: 10.1016/j.str.2005.11.015

  • PubMed Abstract: 
  • Intrinsic resistance to multiple drugs in many gram-negative bacterial pathogens is conferred by resistance nodulation cell division efflux pumps, which are composed of three essential components as typified by the extensively characterized Escherich ...

    Intrinsic resistance to multiple drugs in many gram-negative bacterial pathogens is conferred by resistance nodulation cell division efflux pumps, which are composed of three essential components as typified by the extensively characterized Escherichia coli AcrA-AcrB-TolC system. The inner membrane drug:proton antiporter AcrB and the outer membrane channel TolC export chemically diverse compounds out of the bacterial cell, and require the activity of the third component, the periplasmic protein AcrA. The crystal structures of AcrB and TolC have previously been determined, and we complete the molecular picture of the efflux system by presenting the structure of a stable fragment of AcrA. The AcrA fragment resembles the elongated sickle shape of its homolog Pseudomonas aeruginosa MexA, being composed of three domains: beta-barrel, lipoyl, and alpha-helical hairpin. Notably, unsuspected conformational flexibility in the alpha-helical hairpin domain of AcrA is observed, which has potential mechanistic significance in coupling between AcrA conformations and TolC channel opening.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acriflavine resistance protein A
A, B, C, D
277Escherichia coli (strain K12)Gene Names: acrA (lir, mtcA)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
AcrB bacterial multi-drug efflux transporter
Find proteins for P0AE06 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AE06
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: 2.71 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.237 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 88.788α = 90.00
b = 100.031β = 90.00
c = 332.586γ = 90.00
Software Package:
Software NamePurpose
SHELXDphasing
SHARPphasing
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
DMphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-03-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Advisory, Refinement description