4K7K

Crystal structures of CusC review conformational changes accompanying folding and transmembrane channel formation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structures of CusC Review Conformational Changes Accompanying Folding and Transmembrane Channel Formation.

Lei, H.T.Bolla, J.R.Bishop, N.R.Su, C.C.Yu, E.W.

(2014) J.Mol.Biol. 426: 403-411

  • DOI: 10.1016/j.jmb.2013.09.042
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gram-negative bacteria, such as Escherichia coli, frequently utilize tripartite efflux complexes in the RND (resistance-nodulation-cell division) family to expel diverse toxic compounds from the cell. These complexes span both the inner and outer mem ...

    Gram-negative bacteria, such as Escherichia coli, frequently utilize tripartite efflux complexes in the RND (resistance-nodulation-cell division) family to expel diverse toxic compounds from the cell. These complexes span both the inner and outer membranes of the bacterium via an α-helical, inner membrane transporter; a periplasmic membrane fusion protein; and a β-barrel, outer membrane channel. One such efflux system, CusCBA, is responsible for extruding biocidal Cu(I) and Ag(I) ions. To remove these toxic ions, the CusC outer membrane channel must form a β-barrel structural domain, which creates a pore and spans the entire outer membrane. We here report the crystal structures of wild-type CusC, as well as two CusC mutants, suggesting that the first N-terminal cysteine residue plays an important role in protein-membrane interactions and is critical for the insertion of this channel protein into the outer membrane. These structures provide insight into the mechanisms on CusC folding and transmembrane channel formation. It is found that the interactions between CusC and membrane may be crucial for controlling the opening and closing of this β-barrel, outer membrane channel.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cation efflux system protein CusC
A, B
446Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cusC (ibeB, ylcB)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
CusC heavy metal discharge outer membrane protein
Find proteins for P77211 (Escherichia coli (strain K12))
Go to UniProtKB:  P77211
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 62.014α = 90.00
b = 104.488β = 101.06
c = 72.063γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-04-17 
  • Released Date: 2013-10-16 
  • Deposition Author(s): Su, C.-C., Lei, H.-T.

Revision History 

  • Version 1.0: 2013-10-16
    Type: Initial release
  • Version 1.1: 2014-01-22
    Type: Database references