3MMJ

Structure of the PTP-like phytase from Selenomonas ruminantium in complex with myo-inositol hexakisphosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Substrate binding in protein-tyrosine phosphatase-like inositol polyphosphatases.

Gruninger, R.J.Dobing, S.Smith, A.D.Bruder, L.M.Selinger, L.B.Wieden, H.J.Mosimann, S.C.

(2012) J Biol Chem 287: 9722-9730

  • DOI: 10.1074/jbc.M111.309872
  • Primary Citation of Related Structures:  
    3MMJ, 3MOZ

  • PubMed Abstract: 
  • Protein-tyrosine phosphatase-like inositol polyphosphatases are microbial enzymes that catalyze the stepwise removal of one or more phosphates from highly phosphorylated myo-inositols via a relatively ordered pathway. To understand the substrate specificity and kinetic mechanism of these enzymes we have determined high resolution, single crystal, x-ray crystallographic structures of inactive Selenomonas ruminantium PhyA in complex with myo-inositol hexa- and pentakisphosphate ...

    Protein-tyrosine phosphatase-like inositol polyphosphatases are microbial enzymes that catalyze the stepwise removal of one or more phosphates from highly phosphorylated myo-inositols via a relatively ordered pathway. To understand the substrate specificity and kinetic mechanism of these enzymes we have determined high resolution, single crystal, x-ray crystallographic structures of inactive Selenomonas ruminantium PhyA in complex with myo-inositol hexa- and pentakisphosphate. These structures provide the first glimpse of a myo-inositol polyphosphatase-ligand complex consistent with its known specificity and reveal novel features of the kinetic mechanism. To complement the structural studies, fluorescent binding assays have been developed and demonstrate that the K(d) for this enzyme is several orders of magnitude lower than the K(m). Together with rapid kinetics data, these results suggest that the protein tyrosine phosphatase-like inositol polyphosphatases have a two-step, substrate-binding mechanism that facilitates catalysis.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, Alberta, Canada T1K 3M4.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myo-inositol hexaphosphate phosphohydrolaseA, B314Selenomonas ruminantiumMutation(s): 1 
Gene Names: phyA
UniProt
Find proteins for Q7WUJ1 (Selenomonas ruminantium)
Explore Q7WUJ1 
Go to UniProtKB:  Q7WUJ1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IHP
Query on IHP

Download Ideal Coordinates CCD File 
C [auth A], I [auth B]INOSITOL HEXAKISPHOSPHATE
C6 H18 O24 P6
IMQLKJBTEOYOSI-GPIVLXJGSA-N
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A], J [auth B]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
G [auth A], H [auth A], M [auth B], N [auth B], O [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
E [auth A], F [auth A], K [auth B], L [auth B]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
P [auth B]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.13α = 90
b = 136.95β = 102.95
c = 79.91γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
AMoREphasing
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-06-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-04-17
    Changes: Database references
  • Version 1.3: 2020-10-14
    Changes: Derived calculations, Structure summary