1.0 A Structure of CusF-Ag(I) residues 10-88 from Escherichia coli

Experimental Data Snapshot

  • Resolution: 1.00 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 

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Unusual Cu(I)/Ag(I) coordination of Escherichia coli CusF as revealed by atomic resolution crystallography and X-ray absorption spectroscopy

Loftin, I.R.Franke, S.Blackburn, N.J.McEvoy, M.M.

(2007) Protein Sci 16: 2287-2293

  • DOI: https://doi.org/10.1110/ps.073021307
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Elevated levels of copper or silver ions in the environment are an immediate threat to many organisms. Escherichia coli is able to resist the toxic effects of these ions through strictly limiting intracellular levels of Cu(I) and Ag(I). The CusCFBA system is one system in E. coli responsible for copper/silver tolerance. A key component of this system is the periplasmic copper/silver-binding protein, CusF. Here the X-ray structure and XAS data on the CusF-Ag(I) and CusF-Cu(I) complexes, respectively, are reported. In the CusF-Ag(I) structure, Ag(I) is coordinated by two methionines and a histidine, with a nearby tryptophan capping the metal site. EXAFS measurements on the CusF-Cu(I) complex show a similar environment for Cu(I). The arrangement of ligands effectively sequesters the metal from its periplasmic environment and thus may play a role in protecting the cell from the toxic ion.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, Arizona 85721, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cation efflux system protein cusFA [auth X]80Escherichia coli str. K-12 substr. W3110Mutation(s): 0 
Gene Names: cusFcusX
Find proteins for P77214 (Escherichia coli (strain K12))
Explore P77214 
Go to UniProtKB:  P77214
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP77214
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.00 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.118α = 90
b = 39.351β = 90
c = 44.423γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
Blu-Icedata collection
CrystalCleardata reduction

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2007-10-02 
  • Deposition Author(s): Loftin, I.R.

Revision History  (Full details and data files)

  • Version 1.0: 2007-10-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2023-08-30
    Changes: Data collection, Database references, Refinement description