4C60

Crystal structure of A. niger ochratoxinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Functional Characterization of Ochratoxinase, a Novel Mycotoxin Degrading Enzyme.

Dobritzsch, D.Wang, H.Schneider, G.Yu, S.

(2014) Biochem.J. 462: 441

  • DOI: 10.1042/BJ20140382
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ochratoxin, with ochratoxin A as the dominant form, is one of the five major mycotoxins most harmful to humans and animals. It is produced by Aspergillus and Penicillium species and occurs in a wide range of agricultural products. Detoxification of c ...

    Ochratoxin, with ochratoxin A as the dominant form, is one of the five major mycotoxins most harmful to humans and animals. It is produced by Aspergillus and Penicillium species and occurs in a wide range of agricultural products. Detoxification of contaminated food is a challenging health issue. In the present paper we report the identification, characterization and crystal structure (at 2.2 Å) of a novel microbial ochratoxinase from Aspergillus niger. A putative amidase gene encoding a 480 amino acid polypeptide was cloned and homologously expressed in A. niger. The recombinant protein is N-terminally truncated, thermostable, has optimal activity at pH ~6 and 66°C, and is more efficient in ochratoxin A hydrolysis than carboxypeptidase A and Y, the two previously known enzymes capable of degrading this mycotoxin. The subunit of the homo-octameric enzyme folds into a two-domain structure characteristic of a metal dependent amidohydrolase, with a twisted TIM (triosephosphateisomerase)-barrel and a smaller β-sandwich domain. The active site contains an aspartate residue for acid-base catalysis, and a carboxylated lysine and four histidine residues for binding of a binuclear metal centre.


    Organizational Affiliation

    *Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OCHRATOXINASE
A, B, C, D, E, F, G, H
438Aspergillus niger (strain CBS 513.88 / FGSC A1513)Mutation(s): 0 
EC: 3.4.13.9
Find proteins for A2R2V4 (Aspergillus niger (strain CBS 513.88 / FGSC A1513))
Go to UniProtKB:  A2R2V4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.206 
  • Space Group: I 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 212.671α = 90.00
b = 79.920β = 105.25
c = 218.280γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
SCALAdata scaling
iMOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-02
    Type: Initial release
  • Version 1.1: 2014-09-03
    Type: Database references