The structure of cobalt-substituted pseudoazurin from Alcaligenes faecalis

Experimental Data Snapshot

  • Resolution: 1.86 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

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The crystal structure of cobalt-substituted pseudoazurin from Alcaligenes faecalis.

Gessmann, R.Kyvelidou, C.Papadovasilaki, M.Petratos, K.

(2011) Biopolymers 95: 202-207

  • DOI: https://doi.org/10.1002/bip.21553
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Cu(II) center at the active site of the blue copper protein pseudoazurin from Alcaligenes faecalis has been substituted by Co(II) via denaturing of the protein, chelation and removal of copper by EDTA and refolding of the apo-protein, followed by addition of an aqueous solution of CoCl(2). Sitting drop vapour diffusion experiments produced green hexagonal crystals, which belong to space group P6(5), with unit cell dimensions a = b = 50.03, c = 98.80 Å. Diffraction data, collected at 291 K on a copper rotating anode X-ray source, were phased by the anomalous signal of the cobalt atom. The structure was built automatically, fitted manually and subsequently refined to 1.86 Å resolution. The Co-substituted protein exhibits similar overall geometry to the native structure with copper. Cobalt binds more strongly to the axial Met86-Sδ and retains the tetrahedral arrangement with the four ligand atoms, His40-Nδ(1), Cys78-Sγ, His81-Nδ(1), and 86Met-Sδ, although the structure is less distorted than the native copper protein. The structure reported herein, is the first crystallographic structure of a Co(II)-substituted pseudoazurin.

  • Organizational Affiliation

    I.M.B.B.-FO.R.T.H., N. Plastira 100, Heraklion 70013, Greece.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pseudoazurin123Alcaligenes faecalisMutation(s): 0 
Find proteins for P04377 (Alcaligenes faecalis)
Explore P04377 
Go to UniProtKB:  P04377
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04377
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.86 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.033α = 90
b = 50.033β = 90
c = 98.803γ = 120
Software Package:
Software NamePurpose
Pattersonmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations