4DNT

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Charged Amino Acids (R83, E567, D617, E625, R669, and K678) of CusA Are Required for Metal Ion Transport in the Cus Efflux System.

Su, C.C.Long, F.Lei, H.T.Bolla, J.R.Do, S.V.Rajashankar, K.R.Yu, E.W.

(2012) J.Mol.Biol. 422: 429-441

  • DOI: 10.1016/j.jmb.2012.05.038
  • Primary Citation of Related Structures:  3T51, 3T53, 3T56, 4DOP

  • PubMed Abstract: 
  • Gram-negative bacteria expel various toxic chemicals via tripartite efflux pumps belonging to the resistance-nodulation-cell division superfamily. These pumps span both the inner and outer membranes of the cell. The three components of these triparti ...

    Gram-negative bacteria expel various toxic chemicals via tripartite efflux pumps belonging to the resistance-nodulation-cell division superfamily. These pumps span both the inner and outer membranes of the cell. The three components of these tripartite systems are an inner-membrane, substrate-binding transporter (or pump); a periplasmic membrane fusion protein (or adaptor); and an outer-membrane-anchored channel. These three efflux proteins interact in the periplasmic space to form the three-part complexes. We previously presented the crystal structures of both the inner-membrane transporter CusA and membrane fusion protein CusB of the CusCBA tripartite efflux system from Escherichia coli. We also described the co-crystal structure of the CusBA adaptor-transporter, revealing that the trimeric CusA efflux pump assembles with six CusB protein molecules to form the complex CusB(6)-CusA(3). We here report three different conformers of the crystal structures of CusBA-Cu(I), suggesting a mechanism on how Cu(I) binding initiates a sequence of conformational transitions in the transport cycle. Genetic analysis and transport assays indicate that charged residues, in addition to the methionine pairs and clusters, are essential for extruding metal ions out of the cell.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cation efflux system protein CusB
B, C
413Escherichia coli (strain K12)Gene Names: cusB (ylcD)
Find proteins for P77239 (Escherichia coli (strain K12))
Go to UniProtKB:  P77239
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cation efflux system protein CusA
A
1054Escherichia coli (strain K12)Gene Names: cusA (ybdE)
Find proteins for P38054 (Escherichia coli (strain K12))
Go to UniProtKB:  P38054
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.219 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 159.636α = 90.00
b = 159.636β = 90.00
c = 681.098γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHASERphasing
SCALAdata scaling
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-20
    Type: Initial release
  • Version 1.1: 2012-07-04
    Type: Database references
  • Version 1.2: 2012-09-05
    Type: Database references