1G0I

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


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

  • Primary Citation of Related Structures:  1G0H

  • 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 s ...

    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.Mol.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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INOSITOL MONOPHOSPHATASE
A, B
252Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)Gene Names: suhB
EC: 3.1.3.25, 3.1.3.11
Find proteins for Q57573 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q57573
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
INS
Query on INS

Download SDF File 
Download CCD File 
A, B
1,2,3,4,5,6-HEXAHYDROXY-CYCLOHEXANE
MYO-INOSITOL
C6 H12 O6
CDAISMWEOUEBRE-GPIVLXJGSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.251 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 68.020α = 90.00
b = 78.450β = 90.00
c = 130.050γ = 90.00
Software Package:
Software NamePurpose
SDMSdata reduction
AMoREphasing
SDMSdata scaling
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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