4ZIT

Crystal structure of AcrB in P21 space group


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.272 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures of Gate Loop Variants of the AcrB Drug Efflux Pump Bound by Erythromycin Substrate.

Ababou, A.Koronakis, V.

(2016) PLoS One 11: e0159154-e0159154

  • DOI: 10.1371/journal.pone.0159154
  • Primary Citation of Related Structures:  
    4ZIT, 4ZIV, 4ZIW, 4ZJL, 4ZJO, 4ZJQ

  • PubMed Abstract: 
  • Gram-negative bacteria such as E. coli use tripartite efflux pumps such as AcrAB-TolC to expel antibiotics and noxious compounds. A key feature of the inner membrane transporter component, AcrB, is a short stretch of residues known as the gate/switch loop that divides the proximal and distal substrate binding pockets ...

    Gram-negative bacteria such as E. coli use tripartite efflux pumps such as AcrAB-TolC to expel antibiotics and noxious compounds. A key feature of the inner membrane transporter component, AcrB, is a short stretch of residues known as the gate/switch loop that divides the proximal and distal substrate binding pockets. Amino acid substitutions of the gate loop are known to decrease antibiotic resistance conferred by AcrB. Here we present two new AcrB gate loop variants, the first stripped of its bulky side chains, and a second in which the gate loop is removed entirely. By determining the crystal structures of the variant AcrB proteins in the presence and absence of erythromycin and assessing their ability to confer erythromycin tolerance, we demonstrate that the gate loop is important for AcrB export activity but is not required for erythromycin binding.


    Organizational Affiliation

    Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Multidrug efflux pump subunit AcrBA, B, C, D, E, F1049Escherichia coli K-12Mutation(s): 0 
Gene Names: acrBacrEb0462JW0451
Find proteins for P31224 (Escherichia coli (strain K12))
Explore P31224 
Go to UniProtKB:  P31224
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.272 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.84α = 90
b = 156.856β = 92.7
c = 218.582γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2016-07-27
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Author supporting evidence