1G0H

CRYSTAL STRUCTURE OF MJ0109 GENE PRODUCT INOSITOL MONOPHOSPHATASE-FRUCTOSE 1,6 BISPHOSPHATASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure and catalytic mechanism of the MJ0109 gene product: a bifunctional enzyme with inositol monophosphatase and fructose 1,6-bisphosphatase activities.

Johnson, K.A.Chen, L.Yang, H.Roberts, M.F.Stec, B.

(2001) Biochemistry 40: 618-630

  • DOI: 10.1021/bi0016422
  • Primary Citation of Related Structures:  
    1G0H, 1G0I

  • PubMed Abstract: 
  • Inositol monophosphatase (EC 3.1.3.25) in hyperthermophilic archaea is thought to play a role in the biosynthesis of di-myo-inositol-1,1'-phosphate (DIP), an osmolyte unique to hyperthermophiles. The Methanococcus jannaschii MJ109 gene product, the sequence of which is substantially homologous to that of human inositol monophosphatase, exhibits inositol monophosphatase activity but with substrate specificity that is broader than those of bacterial and eukaryotic inositol monophosphatases (it can also act as a fructose bisphosphatase) ...

    Inositol monophosphatase (EC 3.1.3.25) in hyperthermophilic archaea is thought to play a role in the biosynthesis of di-myo-inositol-1,1'-phosphate (DIP), an osmolyte unique to hyperthermophiles. The Methanococcus jannaschii MJ109 gene product, the sequence of which is substantially homologous to that of human inositol monophosphatase, exhibits inositol monophosphatase activity but with substrate specificity that is broader than those of bacterial and eukaryotic inositol monophosphatases (it can also act as a fructose bisphosphatase). To understand its substrate specificity as well as the poor inhibition by Li(+) (a potent inhibitor of the mammalian enzyme), we have crystallized the enzyme and determined its three-dimensional structure. The overall fold, as expected, is similar to that of the mammalian enzyme, but the details suggest a closer relationship to fructose 1,6-bisphosphatases. Three complexes of the MJ0109 protein with substrate and/or product and inhibitory as well as activating metal ions suggest that the phosphatase mechanism is a three-metal ion assisted catalysis which is in variance with that proposed previously for the human inositol monophosphatase.


    Related Citations: 
    • MJ0109 is an Enzyme that is Both an Inositol Monophosphatse and the 'Missing' Archaeal Fructose-1,6-Bisphosphatase
      Stec, B., Yang, H., Johnson, K.A., Chen, L., Roberts, M.F.
      (2000) Nat Struct Biol 7: 1046

    Organizational Affiliation

    Department of Biochemistry and Cell Biology, W. M. Keck Center for Computational Biology, Rice University, Houston, Texas 77005, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INOSITOL MONOPHOSPHATASEA, B252Methanocaldococcus jannaschiiMutation(s): 0 
EC: 3.1.3.25 (PDB Primary Data), 3.1.3.11 (UniProt)
UniProt
Find proteins for Q57573 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Explore Q57573 
Go to UniProtKB:  Q57573
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ57573
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.18α = 90
b = 75.89β = 90
c = 131.81γ = 90
Software Package:
Software NamePurpose
AMoREphasing
SHELXL-97refinement
SDMSdata reduction
SDMSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance