4ZJO

Crystal structure of AcrB triple mutant in complex with antibiotic in P21 space group


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.241 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 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: https://doi.org/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. 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)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Multidrug efflux pump subunit AcrB
A, B, C, D, E
A, B, C, D, E, F
1,049Escherichia coli str. K-12 substr. MG1655Mutation(s): 3 
Gene Names: acrBacrEb0462JW0451
Membrane Entity: Yes 
UniProt
Find proteins for P31224 (Escherichia coli (strain K12))
Explore P31224 
Go to UniProtKB:  P31224
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31224
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ERY
Query on ERY

Download Ideal Coordinates CCD File 
G [auth A],
N [auth D]
ERYTHROMYCIN A
C37 H67 N O13
ULGZDMOVFRHVEP-RWJQBGPGSA-N
LMT
Query on LMT

Download Ideal Coordinates CCD File 
H [auth A]
I [auth A]
K [auth B]
L [auth C]
O [auth D]
H [auth A],
I [auth A],
K [auth B],
L [auth C],
O [auth D],
P [auth D],
Q [auth E],
S [auth F]
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
NI
Query on NI

Download Ideal Coordinates CCD File 
J [auth A],
M [auth C],
R [auth E]
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.241 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.184α = 90
b = 156.769β = 93.09
c = 218.168γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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, Derived calculations
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description