4U96

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: 2.20 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report


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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.Brandstaetter, L.Verrey, F.Diederichs, K.Faraldo-Gomez, J.D.Pos, K.M.

(2014) Elife 3: e03145

  • DOI: 10.7554/eLife.03145
  • Primary Citation of Related Structures:  
    4U8Y, 4U95, 4U96, 4U8V

  • 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 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 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Multidrug efflux pump subunit AcrBA, B, C1057Escherichia coli K-12Mutation(s): 1 
Gene Names: acrBacrEb0462JW0451
Membrane Entity: Yes 
UniProt
Find proteins for P31224 (Escherichia coli (strain K12))
Explore P31224 
Go to UniProtKB:  P31224
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DARPinD, E169synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.79α = 90
b = 160.77β = 90
c = 246.45γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2014-08-05 
  • Released Date: 2014-10-22 
  • Deposition Author(s): Pos, K.M.

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-22
    Type: Initial release