1MOR

ISOMERASE DOMAIN OF GLUCOSAMINE 6-PHOSPHATE SYNTHASE COMPLEXED WITH GLUCOSE 6-PHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The mechanism of sugar phosphate isomerization by glucosamine 6-phosphate synthase.

Teplyakov, A.Obmolova, G.Badet-Denisot, M.A.Badet, B.

(1999) Protein Sci. 8: 596-602

  • DOI: 10.1110/ps.8.3.596
  • Primary Citation of Related Structures:  1MOS

  • PubMed Abstract: 
  • Glucosamine 6-phosphate synthase converts fructose-6P into glucosamine-6P or glucose-6P depending on the presence or absence of glutamine. The isomerase activity is associated with a 40-kDa C-terminal domain, which has already been characterized crys ...

    Glucosamine 6-phosphate synthase converts fructose-6P into glucosamine-6P or glucose-6P depending on the presence or absence of glutamine. The isomerase activity is associated with a 40-kDa C-terminal domain, which has already been characterized crystallographically. Now the three-dimensional structures of the complexes with the reaction product glucose-6P and with the transition state analog 2-amino-2-deoxyglucitol-6P have been determined. Glucose-6P binds in a cyclic form whereas 2-amino-2-deoxyglucitol-6P is in an extended conformation. The information on ligand-protein interactions observed in the crystal structures together with the isotope exchange and site-directed mutagenesis data allow us to propose a mechanism of the isomerase activity of glucosamine-6P synthase. The sugar phosphate isomerization involves a ring opening step catalyzed by His504 and an enolization step with Glu488 catalyzing the hydrogen transfer from C1 to C2 of the substrate. The enediol intermediate is stabilized by a helix dipole and the epsilon-amino group of Lys603. Lys485 may play a role in deprotonating the hydroxyl O1 of the intermediate.


    Related Citations: 
    • Erratum. Substrate Binding is Required for Assembly of the Active Conformation of the Catalytic Site in Ntn Amidotransferases: Evidence from the 1.8 A Crystal Structure of the Glutaminase Domain of Glucosamine 6-Phosphate Synthase
      Isupov, M.N.,Obmolova, G.,Butterworth, S.,Badet-Denisot, M.A.,Badet, B.,Polikarpov, I.,Littlechild, J.A.,Teplyakov, A.
      (1997) Structure 5: 723
    • The Mechanism of Sugar Phosphate Isomerization by Glucosamine 6-Phosphate Synthase
      Teplyakov, A.,Obmolova, G.,Badet-Denisot, M.A.,Badet, B.
      (1999) Protein Sci. 8: 596
    • Substrate Binding is Required for Assembly of the Active Conformation of the Catalytic Site in Ntn Amidotransferases: Evidence from the 1.8 A Crystal Structure of the Glutaminase Domain of Glucosamine 6-Phosphate Synthase
      Isupov, M.N.,Obmolova, G.,Butterworth, S.,Badet-Denisot, M.A.,Badet, B.,Polikarpov, I.,Littlechild, J.A.,Teplyakov, A.
      (1996) Structure 4: 801
    • Crystallization and Preliminary X-Ray Analysis of the Two Domains of Glucosamine-6-Phosphate Synthase from Escherichia Coli
      Obmolova, G.,Badet-Denisot, M.A.,Badet, B.,Teplyakov, A.
      (1994) J.Mol.Biol. 242: 703


    Organizational Affiliation

    Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. alext@gm-mv.niddk.nih.gov




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GLUCOSAMINE 6-PHOSPHATE SYNTHASE
A
368Escherichia coli (strain K12)Gene Names: glmS
EC: 2.6.1.16
Find proteins for P17169 (Escherichia coli (strain K12))
Go to UniProtKB:  P17169
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G6P
Query on G6P

Download SDF File 
Download CCD File 
A
ALPHA-D-GLUCOSE-6-PHOSPHATE
C6 H13 O9 P
NBSCHQHZLSJFNQ-DVKNGEFBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.191 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 146.100α = 90.00
b = 146.100β = 90.00
c = 173.900γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
BLANCmodel building
BLANCphasing
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1997-04-12 
  • Released Date: 1998-10-07 
  • Deposition Author(s): Teplyakov, A.

Revision History 

  • Version 1.0: 1998-10-07
    Type: Initial release
  • Version 1.1: 2008-03-04
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance