1BF6

PHOSPHOTRIESTERASE HOMOLOGY PROTEIN FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

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This is version 1.2 of the entry. See complete history


Literature

Biochemical characterization and crystallographic structure of an Escherichia coli protein from the phosphotriesterase gene family.

Buchbinder, J.L.Stephenson, R.C.Dresser, M.J.Pitera, J.W.Scanlan, T.S.Fletterick, R.J.

(1998) Biochemistry 37: 5096-5106

  • DOI: 10.1021/bi971707+
  • Primary Citation of Related Structures:  
    1BF6

  • PubMed Abstract: 
  • Phosphotriesterase homology protein (PHP) is a member of a recently discovered family of proteins related to phosphotriesterase, a hydrolytic, bacterial enzyme with an unusual substrate specificity for synthetic organophosphate triesters and phosphorofluoridates, which are common constituents of chemical warfare agents and agricultural pesticides ...

    Phosphotriesterase homology protein (PHP) is a member of a recently discovered family of proteins related to phosphotriesterase, a hydrolytic, bacterial enzyme with an unusual substrate specificity for synthetic organophosphate triesters and phosphorofluoridates, which are common constituents of chemical warfare agents and agricultural pesticides. No natural substrate has been identified for phosphotriesterase, and it has been suggested that the enzyme may have evolved the ability to hydrolyze synthetic compounds in bacteria under selective pressure to meet nutritional needs. PHP, which has 28% sequence identity with phosphotriesterase, may belong to the family of proteins from which phosphotriesterase evolved. Here we report the cloning, expression, initial characterization, and high-resolution X-ray crystallographic structure of PHP. Biochemical analysis shows that PHP is monomeric and binds two zinc ions per monomer. Unlike phosphotriesterase, PHP does not catalyze the hydrolysis of nonspecific phosphotriesters. The structure, similar to that of phosphotriesterase, consists of a long, elliptical alpha/beta barrel and has a binuclear zinc center in a cleft at the carboxy end of the barrel at the location of the presumptive active site.


    Related Citations: 
    • Erratum. Biochemical Characterization and Crystallographic Structure of an Escherichia Coli Protein from the Phosphotriesterase Gene Family
      Buchbinder, J.L., Stephenson, R.C., Dresser, M.J., Pitera, J.W., Scanlan, T.S., Fletterick, R.J.
      (1998) Biochemistry 37: 10860

    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco, California 94143-0448, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOSPHOTRIESTERASE HOMOLOGY PROTEIN AB291Escherichia coliMutation(s): 0 
Find proteins for P45548 (Escherichia coli (strain K12))
Explore P45548 
Go to UniProtKB:  P45548
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.07α = 90
b = 80.8β = 97.1
c = 98.2γ = 90
Software Package:
Software NamePurpose
PHASESphasing
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-06-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance