Zinc-substituted pseudoazurin solved by S/Zn-SAD phasing

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

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Zinc-substituted pseudoazurin solved by S/Zn-SAD phasing.

Gessmann, R.Papadovasilaki, M.Drougkas, E.Petratos, K.

(2015) Acta Crystallogr F Struct Biol Commun 71: 19-23

  • DOI: https://doi.org/10.1107/S2053230X14025552
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The copper(II) centre of the blue copper protein pseudoazurin from Alcaligenes faecalis has been substituted by zinc(II) via denaturing the protein, chelation and removal of copper and refolding the apoprotein, followed by the addition of an aqueous solution of ZnCl2. Vapour-diffusion experiments produced colourless hexagonal crystals (space group P65), which when cryocooled had unit-cell parameters a=b=49.01, c=98.08 Å. Diffraction data collected at 100 K using a copper sealed tube were phased by the weak anomalous signal of five S atoms and one Zn atom. The structure was fitted manually and refined to 1.6 Å resolution. The zinc-substituted protein exhibits similar overall geometry to the native structure with copper. Zn2+ binds more strongly to its four ligand atoms (His40 Nδ1, Cys78 Sγ, His81 Nδ1 and Met86 Sδ) and retains the tetrahedral arrangement, although the structure is less distorted than the native copper protein.

  • Organizational Affiliation

    Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology-Hellas (FORTH), N. Plastira 100, 70 013 Heraklion, 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
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.005α = 90
b = 49.005β = 90
c = 98.083γ = 120
Software Package:
Software NamePurpose
PROTEUM PLUSdata collection
SHELXEmodel building
SAINTdata reduction
SADABSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-02-04
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations