1DK4

CRYSTAL STRUCTURE OF MJ0109 GENE PRODUCT INOSITOL MONOPHOSPHATASE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.331 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.243 

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This is version 1.2 of the entry. See complete history. 


Literature

MJ0109 is an enzyme that is both an inositol monophosphatase 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: 1046-1050

  • DOI: 10.1038/80968
  • Primary Citation of Related Structures:  
    1DK4

  • PubMed Abstract: 

    • In sequenced genomes, protein coding regions with unassigned function constitute between 10 and 50% of all open reading frames. Often key enzymes cannot be identified using sequence homology searches. For example, despite the fact that methanogens have an apparently functional gluconeogenesis pathway, standard tools have been unable to identify a fructose-1,6-bisphosphatase (FBPase) gene in the sequenced Methanoccocus jannaschii genome ...

    In sequenced genomes, protein coding regions with unassigned function constitute between 10 and 50% of all open reading frames. Often key enzymes cannot be identified using sequence homology searches. For example, despite the fact that methanogens have an apparently functional gluconeogenesis pathway, standard tools have been unable to identify a fructose-1,6-bisphosphatase (FBPase) gene in the sequenced Methanoccocus jannaschii genome. Using a combination of functional and structural tools, we have shown that the protein product of the M. jannaschii gene MJ0109, which had been tentatively annotated as an inositol monophosphatase (IMPase), has both IMPase and FBPase activities. Moreover, several gene products annotated as IMPases from different thermophilic organisms also possess FBPase activity. Thus, we have found the FBPase that was 'missing' in thermophiles and shown that it also functions as an IMPase.

    Organizational Affiliation: 

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



Macromolecules
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(by identity cutoff)  |  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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.331 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.243 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.87α = 90
b = 78.43β = 90
c = 129.72γ = 90
Software Package:
Software NamePurpose
AMoREphasing
SHELXL-97refinement
SDMSdata reduction
SDMSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance