1KZM

Distal Heme Pocket Mutant (R38S/H42E) of Recombinant Horseradish Peroxidase C (HRP C).


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.168 

Starting Model: experimental
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This is version 1.6 of the entry. See complete history


Literature

Structural analysis of the two horseradish peroxidase catalytic residue variants H42E and R38S/H42E: implications for the catalytic cycle.

Meno, K.Jennings, S.Smith, A.T.Henriksen, A.Gajhede, M.

(2002) Acta Crystallogr D Biol Crystallogr 58: 1803-1812

  • DOI: https://doi.org/10.1107/s090744490201329x
  • Primary Citation of Related Structures:  
    1KZM, 4ATJ

  • PubMed Abstract: 

    The crystal structures of horseradish peroxidase C (HRPC) active-site mutants H42E and R38S/H42E co-crystallized with benzhydroxamic acid (BHA) and ferulic acid (FA), respectively, have been solved. The 2.5 A crystal structure of the H42E-BHA complex reveals that the side-chain O atoms of Glu42 occupy positions that are very similar to the positions of the two side-chain N atoms of the distal histidine in the wild-type HRPC-BHA structure. The mutation disturbs the hydrogen-bonding network extending from residue 42 to the distal calcium ion and results in the absence of the water molecule that is usually ligated to this ion in plant peroxidases. Consequently, the distal calcium ion is six- rather than seven-coordinated. In the 2.0 A R38S/H42E structure the position of Glu42 is different and no FA is observed in the distal haem pocket. This is a consequence of the absence of the Arg38 side chain, which limits the flexibility of the Glu42 side chain and modulates its acidity, making it unsuitable as a general acid-base catalyst in the reaction cycle. The water ligated to the distal calcium ion is present, showing that the wild-type distal hydrogen-bonding network is preserved. These results show why a glutamic acid residue can substitute for the conserved distal histidine in HRPC and that Arg38 plays a significant role in controlling the positioning and ionization state of the residue at position 42. Furthermore, these structures indicate that changes in the distal cavity are conveyed through the distal hydrogen-bonding network to the distal calcium site.


  • Organizational Affiliation

    Protein Structure Group, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peroxidase C1A308Armoracia rusticanaMutation(s): 2 
Gene Names: PRXC1A or HPRC1
EC: 1.11.1.7
UniProt
Find proteins for P00433 (Armoracia rusticana)
Explore P00433 
Go to UniProtKB:  P00433
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00433
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.4α = 90
b = 66.7β = 90
c = 117.1γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-10-09
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2018-04-04
    Changes: Data collection
  • Version 1.5: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.6: 2023-08-16
    Changes: Data collection, Refinement description