C112D/M121E Pseudomonas Aeruginosa Azurin

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 

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This is version 1.2 of the entry. See complete history


Outer-Sphere Effects on Reduction Potentials of Copper Sites in Proteins: The Curious Case of High Potential Type 2 C112D/M121E Pseudomonas aeruginosa Azurin.

Lancaster, K.M.Sproules, S.Palmer, J.H.Richards, J.H.Gray, H.B.

(2010) J Am Chem Soc 132: 14590-14595

  • DOI: https://doi.org/10.1021/ja105731x
  • Primary Citation of Related Structures:  
    3NP3, 3NP4, 3OQR

  • PubMed Abstract: 

    Redox and spectroscopic (electronic absorption, multifrequency electron paramagnetic resonance (EPR), and X-ray absorption) properties together with X-ray crystal structures are reported for the type 2 Cu(II) C112D/M121E variant of Pseudomonas aeruginosa azurin. The results suggest that Cu(II) is constrained from interaction with the proximal glutamate; this structural frustration implies a "rack" mechanism for the 290 mV (vs NHE) reduction potential measured at neutral pH. At high pH (∼9), hydrogen bonding in the outer coordination sphere is perturbed to allow axial glutamate ligation to Cu(II), with a decrease in potential to 119 mV. These results highlight the role played by outer-sphere interactions, and the structural constraints they impose, in determining the redox behavior of transition metal protein cofactors.

  • Organizational Affiliation

    Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA. kml04747@caltech.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Azurin128Pseudomonas aeruginosaMutation(s): 2 
Gene Names: azuPA4922
Find proteins for P00282 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P00282 
Go to UniProtKB:  P00282
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00282
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.86α = 90
b = 54.24β = 90
c = 94.23γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description