Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 

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This is version 1.4 of the entry. See complete history


Crystal structure of a novel red copper protein from Nitrosomonas europaea.

Lieberman, R.L.Arciero, D.M.Hooper, A.B.Rosenzweig, A.C.

(2001) Biochemistry 40: 5674-5681

  • DOI: https://doi.org/10.1021/bi0102611
  • Primary Citation of Related Structures:  
    1IBY, 1IBZ, 1IC0

  • PubMed Abstract: 

    Nitrosocyanin (NC) is a mononuclear red copper protein isolated from the ammonia oxidizing bacterium Nitrosomonas europaea. Although NC exhibits some sequence homology to classic blue copper proteins, its spectroscopic and electrochemical properties are drastically different. The 1.65 A resolution crystal structure of oxidized NC reveals an unprecedented trimer of single domain cupredoxins. Each copper center is partially covered by an unusual extended beta-hairpin structure from an adjacent monomer. The copper ion is coordinated by His 98, His 103, Cys 95, a single side chain oxygen of Glu 60, and a solvent molecule. In the 2.3 A resolution structure of reduced NC, His 98 shifts away from the copper ion, and the solvent molecule is not observed. The arrangement of these ligands renders the coordination geometry of the NC red copper center distinct from that of blue copper centers. In particular, the red copper center has a higher coordination number and lacks the long Cu-S(Met) and short Cu-S(Cys) bond distances characteristic of blue copper. Moreover, the red copper center is square pyramidal whereas blue copper is typically distorted tetrahedral. Analysis of the NC structure provides insight into possible functions of this new type of biological copper center.

  • Organizational Affiliation

    Departments of Biochemistry, Molecular Biology, and Cell Biology and of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
112Nitrosomonas europaeaMutation(s): 0 
Find proteins for Q820S6 (Nitrosomonas europaea (strain ATCC 19718 / CIP 103999 / KCTC 2705 / NBRC 14298))
Explore Q820S6 
Go to UniProtKB:  Q820S6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ820S6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.378α = 90
b = 96.378β = 90
c = 279.772γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Experimental preparation
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations