1ARW

CRYSTAL STRUCTURES OF CYANIDE-AND TRIIODIDE-BOUND FORMS OF ARTHROMYCES RAMOSUS PEROXIDASE AT DIFFERENT PH VALUES. PERTURBATIONS OF ACTIVE SITE RESIDUES AND THEIR IMPLICATION IN ENZYME CATALYSIS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Crystal structures of cyanide- and triiodide-bound forms of Arthromyces ramosus peroxidase at different pH values. Perturbations of active site residues and their implication in enzyme catalysis.

Fukuyama, K.Kunishima, N.Amada, F.Kubota, T.Matsubara, H.

(1995) J Biol Chem 270: 21884-21892

  • DOI: 10.1074/jbc.270.37.21884
  • Primary Citation of Related Structures:  
    1ARY, 1ARX, 1ARW, 1ARV, 1ARU

  • PubMed Abstract: 
  • The structures of the cyanide and triiodide complexes of Arthromyces ramosus peroxidase (ARP) at different pH values were investigated by x-ray crystallography in order to examine the behavior of the invariant residues of arginine (Arg-52) and distal histidine (His-56) during the enzyme reaction as well as to provide the structural basis of the active site of peroxidase ...

    The structures of the cyanide and triiodide complexes of Arthromyces ramosus peroxidase (ARP) at different pH values were investigated by x-ray crystallography in order to examine the behavior of the invariant residues of arginine (Arg-52) and distal histidine (His-56) during the enzyme reaction as well as to provide the structural basis of the active site of peroxidase. The models of the cyanide complexes at pH 7.5, 5.0, and 4.0, respectively, were refined to the R-factors of 17.8, 17.8, and 18.5% using 7.0-1.6-A resolution data, and those of the triiodide complexes at pH 6.5 and 5.0 refined to 16.9 and 16.8% using 7.0-1.9-A resolution data. The structures of the cyanide complexes at pH 7.5, 5.0, and 4.0 are identical within experimental error. Cyanide ion bound to the heme in the bent conformation rather than in the tilt conformation. Upon cyanide ion binding, the N epsilon atom of His-56 moved toward the ion by rotation of the imidazole ring around the C beta-C gamma bond, but there was little conformational change in the remaining residues. The distance between the N epsilon atom of His-56 and the nitrogen atom of the cyanide suggests the presence of a hydrogen bond between them in the pH range investigated. In the triiodide complexes, one of the two triiodides bound to ARP was located at the distal side of the heme. When triiodide bound to ARP, unlike the rearrangement of the distal arginine of cytochrome c peroxidase that occurs on formation of the fluoride complex or compound I, the side chain of Arg-52 moved little. The conformation of the side chain of His-56, however, changed markedly. Conformational flexibility of His-56 appears to be a requisite for proton translocation from one oxygen atom to the other of HOO- by acid-base catalysis to produce compound I. The iron atom in each cyanide complex (low-spin ferric) is located in the heme plane, whereas in each triiodide complex (high-spin ferric) the iron atom is displaced from the plane about 0.2 A toward the proximal side.


    Related Citations: 
    • Crystal Structure of the Fungal Peroxidase from Arthromyces Ramosus at 1.9 Angstroms Resolution: Structural Comparisons with the Lignin and Cytochrome C Peroxidases
      Kunishima, N., Fukuyama, K., Matsubara, H., Hatanaka, H., Shibano, Y., Amachi, T.
      (1994) J Mol Biol 235: 331
    • Crystallization and Preliminary X-Ray Diffraction Studies of Peroxidase from a Fungus Arthromyces Ramosus
      Kunishima, N., Fukuyama, K., Wakabayashi, S., Sumida, M., Takaya, M., Shibano, Y., Amachi, T., Matsubara, H.
      (1993) Proteins 15: 216

    Organizational Affiliation

    Department of Biology, Faculty of Science, Osaka University, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PEROXIDASEA344Agaricales sp. 'Arthromyces ramosusMutation(s): 0 
EC: 1.11.1.7
UniProt
Find proteins for P28313 (Arthromyces ramosus)
Explore P28313 
Go to UniProtKB:  P28313
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseB2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
F [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
D [auth A], E [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CYN
Query on CYN

Download Ideal Coordinates CCD File 
C [auth A]CYANIDE ION
C N
XFXPMWWXUTWYJX-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.57α = 90
b = 74.57β = 90
c = 117.47γ = 90
Software Package:
Software NamePurpose
ARP/wARPmodel building
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-01-29
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary