Outer membrane protein CusC

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 

Starting Model: experimental
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Crystal Structure of Escherichia coli CusC, the Outer Membrane Component of a Heavy Metal Efflux Pump.

Kulathila, R.Kulathila, R.Indic, M.van den Berg, B.

(2011) PLoS One 6: e15610-e15610

  • DOI: https://doi.org/10.1371/journal.pone.0015610
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    While copper has essential functions as an enzymatic co-factor, excess copper ions are toxic for cells, necessitating mechanisms for regulating its levels. The cusCBFA operon of E. coli encodes a four-component efflux pump dedicated to the extrusion of Cu(I) and Ag(I) ions. We have solved the X-ray crystal structure of CusC, the outer membrane component of the Cus heavy metal efflux pump, to 2.3 Å resolution. The structure has the largest extracellular opening of any outer membrane factor (OMF) protein and suggests, for the first time, the presence of a tri-acylated N-terminal lipid anchor. The CusC protein does not have any obvious features that would make it specific for metal ions, suggesting that the narrow substrate specificity of the pump is provided by other components of the pump, most likely by the inner membrane component CusA.

  • Organizational Affiliation

    University of Massachusetts Medical School, Program in Molecular Medicine, Worcester, Massachusetts, United States of America.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cation efflux system protein cusC446Escherichia coliMutation(s): 0 
Gene Names: cusCibeBylcBb0572JW0561
Membrane Entity: Yes 
Find proteins for P77211 (Escherichia coli (strain K12))
Explore P77211 
Go to UniProtKB:  P77211
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP77211
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.03α = 90
b = 89.03β = 90
c = 473.037γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description