1ETJ

AZURIN MUTANT WITH MET 121 REPLACED BY GLU


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 

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This is version 1.4 of the entry. See complete history


Literature

X-ray structure determination and characterization of the Pseudomonas aeruginosa azurin mutant Met121Glu.

Karlsson, B.G.Tsai, L.C.Nar, H.Sanders-Loehr, J.Bonander, N.Langer, V.Sjolin, L.

(1997) Biochemistry 36: 4089-4095

  • DOI: https://doi.org/10.1021/bi962416o
  • Primary Citation of Related Structures:  
    1ETJ

  • PubMed Abstract: 

    The Met121Glu azurin mutant has been crystallized and the structure determined at a resolution of 2.3 A. In the crystal structure a carboxyl oxygen of Met121Glu is coordinated to the metal at a distance of 2.2 A. Single-crystal resonance Raman spectroscopy was used to show that the glutamic acid residue in the copper site was in the protonated state. Titration of this residue gives rise to a number of unusual, pH-dependent properties: as the pH is increased from 4 to 8, the S(Cys)-Cu ligand-to-metal charge transfer bands are blue shifted and their intensity ratio is reversed, the EPR signal changes from type 1 copper to a new form of protein-bound copper, and the redox potential changes from 370 to 180 mV. The spectroscopic changes in this pH interval are consistent with a two-state model. From the pH dependence of the optical and EPR spectra, pKa = 5.0 for the glutamic acid in the oxidized protein was determined.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Goteborg University, Sweden. Goran.Karlsson@bcbp.gu.se


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AZURIN
A, B, C, D
128Pseudomonas aeruginosaMutation(s): 1 
UniProt
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
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.58α = 90
b = 60.94β = 90.1
c = 81.6γ = 90
Software Package:
Software NamePurpose
MADNESdata collection
X-PLORrefinement
X-PLORmodel building
MADNESdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-04-21
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-18
    Changes: Data collection
  • Version 1.4: 2021-11-03
    Changes: Database references, Derived calculations