Crystal structure of the copper-sensing repressor CsoR with Cu(I) from Geobacillus thermodenitrificans NG80-2

Experimental Data Snapshot

  • Resolution: 2.56 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 

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Cu(I)-mediated allosteric switching in a copper-sensing operon repressor (CsoR).

Chang, F.M.Coyne, H.J.Cubillas, C.Vinuesa, P.Fang, X.Ma, Z.Ma, D.Helmann, J.D.Garcia-de los Santos, A.Wang, Y.X.Dann, C.E.Giedroc, D.P.

(2014) J Biol Chem 289: 19204-19217

  • DOI: https://doi.org/10.1074/jbc.M114.556704
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The copper-sensing operon repressor (CsoR) is representative of a major Cu(I)-sensing family of bacterial metalloregulatory proteins that has evolved to prevent cytoplasmic copper toxicity. It is unknown how Cu(I) binding to tetrameric CsoRs mediates transcriptional derepression of copper resistance genes. A phylogenetic analysis of 227 DUF156 protein members, including biochemically or structurally characterized CsoR/RcnR repressors, reveals that Geobacillus thermodenitrificans (Gt) CsoR characterized here is representative of CsoRs from pathogenic bacilli Listeria monocytogenes and Bacillus anthracis. The 2.56 Å structure of Cu(I)-bound Gt CsoR reveals that Cu(I) binding induces a kink in the α2-helix between two conserved copper-ligating residues and folds an N-terminal tail (residues 12-19) over the Cu(I) binding site. NMR studies of Gt CsoR reveal that this tail is flexible in the apo-state with these dynamics quenched upon Cu(I) binding. Small angle x-ray scattering experiments on an N-terminally truncated Gt CsoR (Δ2-10) reveal that the Cu(I)-bound tetramer is hydrodynamically more compact than is the apo-state. The implications of these findings for the allosteric mechanisms of other CsoR/RcnR repressors are discussed.

  • Organizational Affiliation

    the Department of Microbiology, Cornell University, Ithaca, New York 14853-8101.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Copper-sensitive operon repressor (CsoR)104Geobacillus thermodenitrificans NG80-2Mutation(s): 1 
Gene Names: GTNG_1533
Find proteins for A4INJ9 (Geobacillus thermodenitrificans (strain NG80-2))
Explore A4INJ9 
Go to UniProtKB:  A4INJ9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA4INJ9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.56 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 
  • Space Group: P 6 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.204α = 90
b = 89.204β = 90
c = 57.985γ = 120
Software Package:
Software NamePurpose
Blu-Icedata collection
PHENIXmodel building
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: 2014-05-21
    Type: Initial release
  • Version 1.1: 2014-10-08
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description