1X92

CRYSTAL STRUCTURE OF PSEUDOMONAS AERUGINOSA PHOSPHOHEPTOSE ISOMERASE IN COMPLEX WITH REACTION PRODUCT D-GLYCERO-D-MANNOPYRANOSE-7-PHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and function of sedoheptulose-7-phosphate isomerase, a critical enzyme for lipopolysaccharide biosynthesis and a target for antibiotic adjuvants.

Taylor, P.L.Blakely, K.M.de Leon, G.P.Walker, J.R.McArthur, F.Evdokimova, E.Zhang, K.Valvano, M.A.Wright, G.D.Junop, M.S.

(2008) J.Biol.Chem. 283: 2835-2845

  • DOI: 10.1074/jbc.M706163200
  • Primary Citation of Related Structures:  2I22, 2I2W, 3BJZ

  • PubMed Abstract: 
  • The barrier imposed by lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacteria presents a significant challenge in treatment of these organisms with otherwise effective hydrophobic antibiotics. The absence of L-glycero-D-manno-heptos ...

    The barrier imposed by lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacteria presents a significant challenge in treatment of these organisms with otherwise effective hydrophobic antibiotics. The absence of L-glycero-D-manno-heptose in the LPS molecule is associated with a dramatically increased bacterial susceptibility to hydrophobic antibiotics and thus enzymes in the ADP-heptose biosynthesis pathway are of significant interest. GmhA catalyzes the isomerization of D-sedoheptulose 7-phosphate into D-glycero-D-manno-heptose 7-phosphate, the first committed step in the formation of ADP-heptose. Here we report structures of GmhA from Escherichia coli and Pseudomonas aeruginosa in apo, substrate, and product-bound forms, which together suggest that GmhA adopts two distinct conformations during isomerization through reorganization of quaternary structure. Biochemical characterization of GmhA mutants, combined with in vivo analysis of LPS biosynthesis and novobiocin susceptibility, identifies key catalytic residues. We postulate GmhA acts through an enediol-intermediate isomerase mechanism.


    Related Citations: 
    • Novel pathways for biosynthesis of nucleotide-activated glycero-manno-heptose precursors of bacterial glycoproteins and cell surface polysaccharides
      Valvano, M.A.,Messner, P.,Kosma, P.
      (2002) Microbiology 148: 1979
    • Biosynthesis of inner core lipopolysaccharide in enteric bacteria identification and characterization of a conserved phosphoheptose isomerase
      Brooke, J.S.,Valvano, M.A.
      (1996) J.Biol.Chem. 271: 3608


    Organizational Affiliation

    Department of Biochemistry and Biomedical Sciences, DeGroote School of Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHOHEPTOSE ISOMERASE
A, B
199Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228)Gene Names: gmhA
EC: 5.3.1.28
Find proteins for Q9HVZ0 (Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228))
Go to UniProtKB:  Q9HVZ0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
M7P
Query on M7P

Download SDF File 
Download CCD File 
A, B
D-GLYCERO-D-MANNOPYRANOSE-7-PHOSPHATE
C7 H15 O10 P
SDADNVAZGVDAIM-QTNLNCNHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.176 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 126.338α = 90.00
b = 126.338β = 90.00
c = 113.240γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance