2GN8

Crystal structure of UDP-GlcNAc inverting 4,6-dehydratase in complex with NADP and UDP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Studies of FlaA1 from Helicobacter pylori Reveal the Mechanism for Inverting 4,6-Dehydratase Activity.

Ishiyama, N.Creuzenet, C.Miller, W.L.Demendi, M.Anderson, E.M.Harauz, G.Lam, J.S.Berghuis, A.M.

(2006) J.Biol.Chem. 281: 24489-24495

  • DOI: 10.1074/jbc.M602393200
  • Primary Citation of Related Structures:  2GN4, 2GN6, 2GN9, 2GNA

  • PubMed Abstract: 
  • FlaA1 from the human pathogen Helicobacter pylori is an enzyme involved in saccharide biosynthesis that has been shown to be essential for pathogenicity. Here we present five crystal structures of FlaA1 in the presence of substrate, inhibitors, and b ...

    FlaA1 from the human pathogen Helicobacter pylori is an enzyme involved in saccharide biosynthesis that has been shown to be essential for pathogenicity. Here we present five crystal structures of FlaA1 in the presence of substrate, inhibitors, and bound cofactor, with resolutions ranging from 2.8 to 1.9 A. These structures reveal that the enzyme is a novel member of the short-chain dehydrogenase/reductase superfamily. Additional electron microscopy studies show the enzyme to possess a hexameric doughnut-shaped quaternary structure. NMR analyses of "real time" enzyme-substrate reactions indicate that FlaA1 is a UDP-GlcNAc-inverting 4,6-dehydratase, suggesting that the enzyme catalyzes the first step in the biosynthetic pathway of a pseudaminic acid derivative, which is implicated in protein glycosylation. Guided by evidence from site-directed mutagenesis and computational simulations, a three-step reaction mechanism is proposed that involves Lys-133 functioning as both a catalytic acid and base.


    Organizational Affiliation

    Department of Biochemistry and Department of Microbiology and Immunology, McGill University, Montreal, Quebec.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UDP-GlcNAc C6 dehydratase
A, B
344Helicobacter pylori (strain ATCC 700392 / 26695)Gene Names: pseB (flaA1)
EC: 4.2.1.115
Find proteins for O25511 (Helicobacter pylori (strain ATCC 700392 / 26695))
Go to UniProtKB:  O25511
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download SDF File 
Download CCD File 
A, B
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
2'-MONOPHOSPHOADENOSINE 5'-DIPHOSPHORIBOSE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
UDP
Query on UDP

Download SDF File 
Download CCD File 
A, B
URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.209 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 111.056α = 90.00
b = 111.056β = 90.00
c = 107.790γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
CNSphasing
SCALEPACKdata scaling
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-09
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description