3NE5

Crystal structure of the CusBA heavy-metal efflux complex from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of the CusBA heavy-metal efflux complex of Escherichia coli.

Su, C.C.Long, F.Zimmermann, M.T.Rajashankar, K.R.Jernigan, R.L.Yu, E.W.

(2011) Nature 470: 558-562

  • DOI: 10.1038/nature09743
  • Primary Citation of Related Structures:  
    3NE5

  • PubMed Abstract: 
  • Gram-negative bacteria, such as Escherichia coli, expel toxic chemicals through tripartite efflux pumps that span both the inner and outer membrane. The three parts are an inner membrane, substrate-binding transporter; a membrane fusion protein; and ...

    Gram-negative bacteria, such as Escherichia coli, expel toxic chemicals through tripartite efflux pumps that span both the inner and outer membrane. The three parts are an inner membrane, substrate-binding transporter; a membrane fusion protein; and an outer-membrane-anchored channel. The fusion protein connects the transporter to the channel within the periplasmic space. A crystallographic model of this tripartite efflux complex has been unavailable because co-crystallization of the various components of the system has proven to be extremely difficult. We previously described the crystal structures of both the inner membrane transporter CusA and the membrane fusion protein CusB of the CusCBA efflux system of E. coli. Here we report the co-crystal structure of the CusBA efflux complex, showing that the transporter (or pump) CusA, which is present as a trimer, interacts with six CusB protomers and that the periplasmic domain of CusA is involved in these interactions. The six CusB molecules seem to form a continuous channel. The affinity of the CusA and CusB interaction was found to be in the micromolar range. Finally, we have predicted a three-dimensional structure for the trimeric CusC outer membrane channel and developed a model of the tripartite efflux assemblage. This CusC(3)-CusB(6)-CusA(3) model shows a 750-kilodalton efflux complex that spans the entire bacterial cell envelope and exports Cu I and Ag I ions.


    Organizational Affiliation

    Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cation efflux system protein cusBBC413Escherichia coli K-12Mutation(s): 0 
Gene Names: cusBylcDb0574JW0563
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
CusBA heavy-metal efflux complex
Find proteins for P77239 (Escherichia coli (strain K12))
Explore P77239 
Go to UniProtKB:  P77239
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cation efflux system protein cusAA1054Escherichia coli K-12Mutation(s): 0 
Gene Names: cusAybdEb0575JW0564
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
CusBA heavy-metal efflux complex
Find proteins for P38054 (Escherichia coli (strain K12))
Explore P38054 
Go to UniProtKB:  P38054
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 160.267α = 90
b = 160.267β = 90
c = 682.835γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
DENZOdata reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2010-06-08 
  • Released Date: 2011-03-02 
  • Deposition Author(s): Su, C.-C.

Revision History 

  • Version 1.0: 2011-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-09-18
    Changes: Derived calculations
  • Version 1.3: 2017-11-08
    Changes: Refinement description