1VNH

CHLOROPEROXIDASE FROM THE FUNGUS CURVULARIA INAEQUALIS: MUTANT H496A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

X-ray crystal structures of active site mutants of the vanadium-containing chloroperoxidase from the fungus Curvularia inaequalis.

Macedo-Ribeiro, S.Hemrika, W.Renirie, R.Wever, R.Messerschmidt, A.

(1999) J Biol Inorg Chem 4: 209-219

  • DOI: 10.1007/s007750050306
  • Primary Citation of Related Structures:  
    1VNH, 1VNG, 1VNF, 1VNE, 1VNI, 1VNS

  • PubMed Abstract: 
  • The X-ray structures of the chloroperoxidase from Curvularia inaequalis, heterologously expressed in Saccharomyces cerevisiae, have been determined both in its apo and in its holo forms at 1.66 and 2.11 A resolution, respectively. The crystal structures reveal that the overall structure of this enzyme remains nearly unaltered, particularly at the metal binding site ...

    The X-ray structures of the chloroperoxidase from Curvularia inaequalis, heterologously expressed in Saccharomyces cerevisiae, have been determined both in its apo and in its holo forms at 1.66 and 2.11 A resolution, respectively. The crystal structures reveal that the overall structure of this enzyme remains nearly unaltered, particularly at the metal binding site. At the active site of the apo-chloroperoxidase structure a clearly defined sulfate ion was found, partially stabilised through electrostatic interactions and hydrogen bonds with positively charged residues involved in the interactions with the vanadate in the native protein. The vanadate binding pocket seems to form a very rigid frame stabilising oxyanion binding. The rigidity of this active site matrix is the result of a large number of hydrogen bonding interactions involving side chains and the main chain of residues lining the active site. The structures of single site mutants to alanine of the catalytic residue His404 and the vanadium protein ligand His496 have also been analysed. Additionally we determined the structural effects of mutations to alanine of residue Arg360, directly involved in the compensation of the negative charge of the vanadate group, and of residue Asp292 involved in forming a salt bridge with Arg490 which also interacts with the vanadate. The enzymatic chlorinating activity is drastically reduced to approximately 1% in mutants D292A, H404A and H496A. The structures of the mutants confirm the view of the active site of this chloroperoxidase as a rigid matrix providing an oxyanion binding site. No large changes are observed at the active site for any of the analysed mutants. The empty space left by replacement of large side chains by alanines is usually occupied by a new solvent molecule which partially replaces the hydrogen bonding interactions to the vanadate. The new solvent molecules additionally replace part of the interactions the mutated side chains were making to other residues lining the active site frame. When this is not possible, another side chain in the proximity of the mutated residue moves in order to satisfy the hydrogen bonding potential of the residues located at the active site frame.


    Related Citations: 
    • X-Ray Structure of a Vanadium-Containing Enzyme: Chloroperoxidase from the Fungus Curvularia Inaequalis
      Messerschmidt, A., Wever, R.
      (1996) Proc Natl Acad Sci U S A 93: 392

    Organizational Affiliation

    Max-Planck Institut für Biochemie, Abteilung Strukturforschung, Martinsried, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
VANADIUM CHLOROPEROXIDASEA609Curvularia inaequalisMutation(s): 1 
Gene Names: CPO
EC: 1.11.1.10
UniProt
Find proteins for P49053 (Curvularia inaequalis)
Explore P49053 
Go to UniProtKB:  P49053
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
VO4
Query on VO4

Download Ideal Coordinates CCD File 
B [auth A]VANADATE ION
O4 V
LSGOVYNHVSXFFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.34α = 90
b = 131.34β = 90
c = 112.66γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-08-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-03-14
    Changes: Advisory, Database references, Other