1UDC

STRUCTURE OF UDP-GALACTOSE-4-EPIMERASE COMPLEXED WITH UDP-MANNOSE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural analysis of UDP-sugar binding to UDP-galactose 4-epimerase from Escherichia coli.

Thoden, J.B.Hegeman, A.D.Wesenberg, G.Chapeau, M.C.Frey, P.A.Holden, H.M.

(1997) Biochemistry 36: 6294-6304

  • DOI: 10.1021/bi970025j
  • Primary Citation of Related Structures:  1UDA, 1UDB

  • PubMed Abstract: 
  • UDP-galactose 4-epimerase from Escherichia coli catalyzes the interconversion of UDP-galactose and UDP-glucose through the transient reduction of the tightly bound cofactor NAD+. The enzyme is unique among the NAD+-dependent enzymes in that it promot ...

    UDP-galactose 4-epimerase from Escherichia coli catalyzes the interconversion of UDP-galactose and UDP-glucose through the transient reduction of the tightly bound cofactor NAD+. The enzyme is unique among the NAD+-dependent enzymes in that it promotes stereospecific reduction of the cofactor but nonstereospecific hydride return during normal catalysis. In addition to hydride transfer, the reaction mechanism of epimerase involves two key features: the abstraction of a proton from the 4'-hydroxyl group of glucose or galactose by an active site base and the rotation of a 4-ketopyranose intermediate in the active site pocket. To address the second issue of movement within the active site, the X-ray structures of reduced epimerase complexed with UDP-mannose, UDP-4-deoxy-4-fluoro-alpha-D-galactose, or UDP-4-deoxy-4-fluoro-alpha-D-glucose have been determined and refined to 1.65, 1.8, and 1.65 A resolution, respectively. A comparison of these models to that of the previously determined epimerase/NADH/UDP-glucose abortive complex reveals that the active site accommodates the various sugars by simple rearrangements of water molecules rather than by large changes in side chain conformations. In fact, the polypeptide chains for all of the epimerase/NADH/UDP-sugar complexes studied thus far are remarkably similar and can be superimposed with root-mean-square deviations of not greater than 0.24 A. The only significant differences between the various enzyme/UDP-sugar models occur in two of the dihedral angles defining the conformation of the UDP-sugar ligands.


    Organizational Affiliation

    Institute for Enzyme Research, College of Agricultural and Life Sciences, University of Wisconsin-Madison 53705, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UDP-GALACTOSE-4-EPIMERASE
A
338Escherichia coli (strain K12)Gene Names: galE (galD)
EC: 5.1.3.2
Find proteins for P09147 (Escherichia coli (strain K12))
Go to UniProtKB:  P09147
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NAD
Query on NAD

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Download CCD File 
A
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
UFM
Query on UFM

Download SDF File 
Download CCD File 
A
URIDINE-5'-DIPHOSPHATE-MANNOSE
C15 H24 N2 O17 P2
HSCJRCZFDFQWRP-NYYOCOOHSA-N
 Ligand Interaction
PGE
Query on PGE

Download SDF File 
Download CCD File 
A
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Work: 0.177 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 83.500α = 90.00
b = 83.500β = 90.00
c = 108.900γ = 120.00
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-01-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model