3T56

Crystal structure of the pre-extrusion state of the CusBA adaptor-transporter complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.42 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 

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:  
    4DNT, 4DOP, 3T51, 3T53, 3T56

  • 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 tripartite systems are an inner-membrane, substrate-binding transporter (or pump); a periplasmic membrane fusion protein (or adaptor); and an outer-membrane-anchored channel ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cation efflux system protein CusAA1054Escherichia coli K-12Mutation(s): 0 
Gene Names: b0575cusACusBJW0564ybdE
Find proteins for P38054 (Escherichia coli (strain K12))
Explore P38054 
Go to UniProtKB:  P38054
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 CusBB, C336Escherichia coli K-12Mutation(s): 0 
Gene Names: cusBylcDb0574JW0563
Find proteins for P77239 (Escherichia coli (strain K12))
Explore P77239 
Go to UniProtKB:  P77239
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CU
Query on CU

Download Ideal Coordinates CCD File 
D [auth A]COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.42 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 160.121α = 90
b = 160.121β = 90
c = 684.945γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

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