1IQC

Crystal structure of Di-Heme Peroxidase from Nitrosomonas europaea


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of Nitrosomonas europaea cytochrome c peroxidase and the structural basis for ligand switching in bacterial di-heme peroxidases

Shimizu, H.Schuller, D.J.Lanzilotta, W.N.Sundaramoorthy, M.Arciero, D.M.Hooper, A.B.Poulos, T.L.

(2001) Biochemistry 40: 13483-13490


  • PubMed Abstract: 
  • The crystal structure of the fully oxidized di-heme peroxidase from Nitrosomonas europaea has been solved to a resolution of 1.80 A and compared to the closely related enzyme from Pseudomonas aeruginosa. Both enzymes catalyze the peroxide-dependent o ...

    The crystal structure of the fully oxidized di-heme peroxidase from Nitrosomonas europaea has been solved to a resolution of 1.80 A and compared to the closely related enzyme from Pseudomonas aeruginosa. Both enzymes catalyze the peroxide-dependent oxidation of a protein electron donor such as cytochrome c. Electrons enter the enzyme through the high-potential heme followed by electron transfer to the low-potential heme, the site of peroxide activation. Both enzymes form homodimers, each of which folds into two distinct heme domains. Each heme is held in place by thioether bonds between the heme vinyl groups and Cys residues. The high-potential heme in both enzymes has Met and His as axial heme ligands. In the Pseudomonas enzyme, the low-potential heme has two His residues as axial heme ligands [Fulop et al. (1995) Structure 3, 1225-1233]. Since the site of reaction with peroxide is the low-potential heme, then one His ligand must first dissociate. In sharp contrast, the low-potential heme in the Nitrosomonas enzyme already is in the "activated" state with only one His ligand and an open distal axial ligation position available for reaction with peroxide. A comparison between the two enzymes illustrates the range of conformational changes required to activate the Pseudomonas enzyme. This change involves a large motion of a loop containing the dissociable His ligand from the heme pocket to the molecular surface where it forms part of the dimer interface. Since the Nitrosomonas enzyme is in the active state, the structure provides some insights on residues involved in peroxide activation. Most importantly, a Glu residue situated near the peroxide binding site could possibly serve as an acid-base catalytic group required for cleavage of the peroxide O--O bond.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Analysis of Cytochrome C553 Peroxidase from Nitrosomonas europaea
      Pappa, H.,Li, H.,Sundaramoorthy, M.,Arciero, D.,Hooper, A.,Poulos, T.L.
      (1996) J.STRUCT.BIOL. 116: 429


    Organizational Affiliation

    Department of Molecular Biology & Biochemistry, University of California, Irvine, California 92697-3900, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
di-heme peroxidase
A, B, C, D
308Nitrosomonas europaea (strain ATCC 19718 / NBRC 14298)Gene Names: ccp
EC: 1.11.1.5
Find proteins for P55929 (Nitrosomonas europaea (strain ATCC 19718 / NBRC 14298))
Go to UniProtKB:  P55929
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

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Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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A, B, C, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

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Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.222 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 88.134α = 90.00
b = 55.111β = 103.60
c = 144.000γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
AMoREphasing
CCP4data scaling
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2001-07-20 
  • Released Date: 2002-01-23 
  • Deposition Author(s): Shimizu, H.

Revision History 

  • Version 1.0: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance