1ALK

REACTION MECHANISM OF ALKALINE PHOSPHATASE BASED ON CRYSTAL STRUCTURES. TWO METAL ION CATALYSIS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 

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This is version 1.2 of the entry. See complete history


Literature

Reaction mechanism of alkaline phosphatase based on crystal structures. Two-metal ion catalysis.

Kim, E.E.Wyckoff, H.W.

(1991) J Mol Biol 218: 449-464

  • DOI: 10.1016/0022-2836(91)90724-k
  • Primary Citation of Related Structures:  
    1ALK

  • PubMed Abstract: 
  • Alkaline phosphatase (AP) is a widely distributed non-specific phosphomonoesterase that functions through formation of a covalent phosphoseryl intermediate (E-P). The enzyme also catalyzes phosphoryl transfer reaction to various alcohols. Escherichia coli AP is a homodimer with 449 residues per monomer ...

    Alkaline phosphatase (AP) is a widely distributed non-specific phosphomonoesterase that functions through formation of a covalent phosphoseryl intermediate (E-P). The enzyme also catalyzes phosphoryl transfer reaction to various alcohols. Escherichia coli AP is a homodimer with 449 residues per monomer. It is a metalloenzyme with two Zn2+ and one Mg2+ at each active site. The crystal structure of native E. coli AP complexed with inorganic phosphate (Pi), which is a strong competitive inhibitor as well as a substrate for the reverse reaction, has been refined at 2.0 A resolution. Some parts of the molecular have been retraced, starting from the previous 2.8 A study. The active site has been modified substantially and is described in this paper. The changes in the active site region suggest the need to reinterpret earlier spectral data, and suggestions are made. Also presented are the structures of the Cd-substituted enzyme complexed with inorganic phosphate at 2.5 A resolution, and the phosphate-free native enzyme at 2.8 A resolution. At pH 7.5, where the X-ray data were collected, the Cd-substituted enzyme is predominantly the covalent phosphoenzyme (E-P) while the native Zn/Mg enzyme exists in predominantly noncovalent (E.P) form. Implication of these results for the catalytic mechanism of the enzyme is discussed. APs from other sources are believed to function in a similar manner.


    Related Citations: 
    • Bacillus Subtilis Alkaline Phosphatases III and Iv. Cloning, Sequencing, and Comparisons of Deduced Amino Acid Sequence with Escherichia Coli Alkaline Phosphatase Three-Dimensional Structure
      Hulett, F.M., Kim, E.E., Bookstein, C., Kapp, N.V., Edwards, C.W., Wyckoff, H.W.
      (1991) J Biol Chem 266: 1077
    • Structure of Alkaline Phosphatases
      Kim, E.E., Wyckoff, H.W.
      (1989) Clin Chim Acta 186: 175
    • Refined Structure of Alkaline Phosphatase
      Sowadski, J.M., Handschumacher, M.D., Murthy, H.M.K., Foster, B.A., Wyckoff, H.W.
      (1985) J Mol Biol 186: 417

    Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALKALINE PHOSPHATASEA, B449Escherichia coliMutation(s): 0 
EC: 3.1.3.1
UniProt
Find proteins for P00634 (Escherichia coli (strain K12))
Explore P00634 
Go to UniProtKB:  P00634
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 195.3α = 90
b = 167.4β = 90
c = 76.7γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
PROFFTrefinement
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 1993-03-03 
  • Released Date: 1994-01-31 
  • Deposition Author(s): Kim, E.E., Wyckoff, W.

Revision History  (Full details and data files)

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance