4U8V

Coupling of remote alternating-access transport mechanisms for protons and substrates in the multidrug efflux pump AcrB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

wwPDB Validation 3D Report Full Report



Literature

Coupling of remote alternating-access transport mechanisms for protons and substrates in the multidrug efflux pump AcrB.

Eicher, T.Seeger, M.A.Anselmi, C.Zhou, W.Brandstatter, L.Verrey, F.Diederichs, K.Faraldo-Gomez, J.D.Pos, K.M.

(2014) Elife 3

  • DOI: 10.7554/eLife.03145
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Membrane transporters of the RND superfamily confer multidrug resistance to pathogenic bacteria, and are essential for cholesterol metabolism and embryonic development in humans. We use high-resolution X-ray crystallography and computational methods ...

    Membrane transporters of the RND superfamily confer multidrug resistance to pathogenic bacteria, and are essential for cholesterol metabolism and embryonic development in humans. We use high-resolution X-ray crystallography and computational methods to delineate the mechanism of the homotrimeric RND-type proton/drug antiporter AcrB, the active component of the major efflux system AcrAB-TolC in Escherichia coli, and one most complex and intriguing membrane transporters known to date. Analysis of wildtype AcrB and four functionally-inactive variants reveals an unprecedented mechanism that involves two remote alternating-access conformational cycles within each protomer, namely one for protons in the transmembrane region and another for drugs in the periplasmic domain, 50 Å apart. Each of these cycles entails two distinct types of collective motions of two structural repeats, coupled by flanking α-helices that project from the membrane. Moreover, we rationalize how the cross-talk among protomers across the trimerization interface might lead to a more kinetically efficient efflux system.


    Organizational Affiliation

    Institute of Biochemistry, Goethe University, Frankfurt am Main, Germany.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Multidrug efflux pump subunit AcrB
A, B, C
1057Escherichia coliMutation(s): 1 
Gene Names: acrBacrEb0462JW0451
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
AcrB D407N mutant
Find proteins for P31224 (Escherichia coli (strain K12))
Go to UniProtKB:  P31224

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DARPin
D, E
169synthetic constructMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT

Download CCD File 
A, B, C
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
 Ligand Interaction
MIY
Query on MIY

Download CCD File 
B
(4S,4AS,5AR,12AS)-4,7-BIS(DIMETHYLAMINO)-3,10,12,12A-TETRAHYDROXY-1,11-DIOXO-1,4,4A,5,5A,6,11,12A-OCTAHYDROTETRACENE-2- CARBOXAMIDE
C23 H27 N3 O7
DYKFCLLONBREIL-KVUCHLLUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.59α = 90
b = 161.59β = 90
c = 245.97γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2014-08-04 
  • Released Date: 2014-10-15 
  • Deposition Author(s): Pos, K.M.

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release