1IQC

Crystal structure of Di-Heme Peroxidase from Nitrosomonas europaea

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.222 

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This is version 2.0 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

  • DOI: 10.1021/bi011481h
  • Primary Citation of Related Structures:  
    1IQC

  • 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 oxidation of a protein electron donor such as cytochrome c ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
di-heme peroxidaseA, B, C, D308Nitrosomonas europaeaMutation(s): 0 
EC: 1.11.1.5
UniProt
Find proteins for P55929 (Nitrosomonas europaea (strain ATCC 19718 / CIP 103999 / KCTC 2705 / NBRC 14298))
Explore P55929 
Go to UniProtKB:  P55929
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP55929
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEC
Query on HEC
Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
K [auth B],
L [auth B],
O [auth C],
H [auth A],
I [auth A],
K [auth B],
L [auth B],
O [auth C],
P [auth C],
S [auth D],
T [auth D]
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
M [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
J [auth B],
N [auth C],
Q [auth D]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
G [auth A],
R [auth D]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 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
b = 55.111β = 103.6
c = 144γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

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

Revision History  (Full details and data files)

  • Version 1.0: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2019-10-02
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary