1PTA

THREE-DIMENSIONAL STRUCTURE OF PHOSPHOTRIESTERASE: AN ENZYME CAPABLE OF DETOXIFYING ORGANOPHOSPHATE NERVE AGENTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Three-dimensional structure of phosphotriesterase: an enzyme capable of detoxifying organophosphate nerve agents.

Benning, M.M.Kuo, J.M.Raushel, F.M.Holden, H.M.

(1994) Biochemistry 33: 15001-15007


  • PubMed Abstract: 
  • Organophosphates, such as parathion and paraoxon, constitute the largest class of insecticides currently used in industrialized nations. In addition, many of these compounds are known to inhibit mammalian acetylcholinesterases thereby acting as nerve ...

    Organophosphates, such as parathion and paraoxon, constitute the largest class of insecticides currently used in industrialized nations. In addition, many of these compounds are known to inhibit mammalian acetylcholinesterases thereby acting as nerve agents. Consequently, organophosphate-degrading enzymes are of considerable interest in light of their ability to detoxify such compounds. Here we report the three-dimensional structure of such an enzyme, namely, phosphotriesterase, as determined by single crystal X-ray diffraction analysis to 2.1-A resolution. Crystals employed in this investigation belonged to the space group P2(1)2(1)2 with unit cell dimensions of a = 80.3 A, b = 93.4 A, and c = 44.8 A and one molecule per asymmetric unit. The structure was solved by multiple isomorphous replacement with two heavy-atom derivatives and refined to a crystallographic R factor of 18.0%. As observed in various other enzymes, the overall fold of the molecule consists of an alpha/beta barrel with eight strands of parallel beta-pleated sheet. In addition, there are two antiparallel beta-strands at the N-terminus. The molecular model of phosphotriesterase presented here provides the initial structural framework necessary toward understanding the enzyme's broad substrate specificities and its catalytic mechanism.


    Related Citations: 
    • Three-Dimensional Structure of the Binuclear Metal Center of Phosphotriesterase
      Benning, M.M.,Kuo, J.M.,Raushel, F.M.,Holden, H.M.
      (1995) Biochemistry 34: 7973


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison 53705.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHOTRIESTERASE
A
327Brevundimonas diminutaGene Names: opd
EC: 3.1.8.1
Find proteins for P0A434 (Brevundimonas diminuta)
Go to UniProtKB:  P0A434
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 80.200α = 90.00
b = 93.700β = 90.00
c = 45.000γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-12-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other