1K0W

CRYSTAL STRUCTURE OF L-RIBULOSE-5-PHOSPHATE 4-EPIMERASE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

The structure of L-ribulose-5-phosphate 4-epimerase: an aldolase-like platform for epimerization

Luo, Y., Samuel, J., Mosimann, S.C., Lee, J.E., Tanner, M.E., Strynadka, N.C.J.

(2001) Biochemistry 40: 14763-14771

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • The structure of L-ribulose-5-phosphate 4-epimerase from E. coli has been solved to 2.4 A resolution using X-ray diffraction data. The structure is homo-tetrameric and displays C(4) symmetry. Each subunit has a single domain comprised of a central be ...

    The structure of L-ribulose-5-phosphate 4-epimerase from E. coli has been solved to 2.4 A resolution using X-ray diffraction data. The structure is homo-tetrameric and displays C(4) symmetry. Each subunit has a single domain comprised of a central beta-sheet flanked on either side by layers of alpha-helices. The active site is identified by the position of the catalytic zinc residue and is located at the interface between two adjacent subunits. A remarkable feature of the structure is that it shows a very close resemblance to that of L-fuculose-1-phosphate aldolase. This is consistent with the notion that both enzymes belong to a superfamily of epimerases/aldolases that catalyze carbon-carbon bond cleavage reactions via a metal-stabilized enolate intermediate. Detailed inspection of the epimerase structure, however, indicates that despite the close overall structural similarity to class II aldolases, the enzyme has evolved distinct active site features that promote its particular chemistry.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L-RIBULOSE 5 PHOSPHATE 4-EPIMERASE
A, B, C, D, E, F
231Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: araD
EC: 5.1.3.4
Find proteins for P08203 (Escherichia coli (strain K12))
Go to UniProtKB:  P08203
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
A, B, C, D, E, F
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.205 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 105.900α = 90.00
b = 105.900β = 90.00
c = 274.800γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance