Crystal structure of the Ag(I) form of E. coli CueR, a copper efflux regulator

Experimental Data Snapshot

  • Resolution: 2.07 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 

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Molecular basis of metal-ion selectivity and zeptomolar sensitivity by CueR

Changela, A.Chen, K.Xue, Y.Holschen, J.Outten, C.E.O'Halloran, T.V.Mondragon, A.

(2003) Science 301: 1383-1387

  • DOI: https://doi.org/10.1126/science.1085950
  • Primary Citation of Related Structures:  
    1Q05, 1Q06, 1Q07, 1Q08, 1Q09, 1Q0A

  • PubMed Abstract: 

    The earliest of a series of copper efflux genes in Escherichia coli are controlled by CueR, a member of the MerR family of transcriptional activators. Thermodynamic calibration of CueR reveals a zeptomolar (10(-21) molar) sensitivity to free Cu+, which is far less than one atom per cell. Atomic details of this extraordinary sensitivity and selectivity for +1transition-metal ions are revealed by comparing the crystal structures of CueR and a Zn2+-sensing homolog, ZntR. An unusual buried metal-receptor site in CueR restricts the metal to a linear, two-coordinate geometry and uses helix-dipole and hydrogen-bonding interactions to enhance metal binding. This binding mode is rare among metalloproteins but well suited for an ultrasensitive genetic switch.

  • Organizational Affiliation

    Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, 2205Tech Drive, Evanston, IL 60208, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulator cueR
A, B
135Escherichia coliMutation(s): 0 
Gene Names: cueR
Find proteins for P0A9G4 (Escherichia coli (strain K12))
Explore P0A9G4 
Go to UniProtKB:  P0A9G4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A9G4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.07 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.516α = 90
b = 66.583β = 90
c = 81.821γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-16
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance