9XIA

X-RAY ANALYSIS OF D-XYLOSE ISOMERASE AT 1.9 ANGSTROMS: NATIVE ENZYME IN COMPLEX WITH SUBSTRATE AND WITH A MECHANISM-DESIGNED INACTIVATOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray analysis of D-xylose isomerase at 1.9 A: native enzyme in complex with substrate and with a mechanism-designed inactivator.

Carrell, H.L.Glusker, J.P.Burger, V.Manfre, F.Tritsch, D.Biellmann, J.F.

(1989) Proc.Natl.Acad.Sci.USA 86: 4440-4444

  • Primary Citation of Related Structures:  8XIA

  • PubMed Abstract: 
  • The structures of crystalline D-xylose isomerase (D-xylose ketol-isomerase; EC 5.3.1.5) from Streptomyces rubiginosus and of its complexes with substrate and with an active-site-directed inhibitor have been determined by x-ray diffraction techniques ...

    The structures of crystalline D-xylose isomerase (D-xylose ketol-isomerase; EC 5.3.1.5) from Streptomyces rubiginosus and of its complexes with substrate and with an active-site-directed inhibitor have been determined by x-ray diffraction techniques and refined to 1.9-A resolution. This study identifies the active site, as well as two metal-binding sites. The metal ions are important in maintaining the structure of the active-site region and one of them binds C3-O and C5-O of the substrate forming a six-membered ring. This study has revealed a very close contact between histidine and C1 of a substrate, suggesting that this is the active-site base that abstracts a proton from substrate. The mechanism-based inhibitor is a substrate analog and is turned over by the enzyme to give a product that alkylates this same histidine, reinforcing our interpretation. The changes in structure of the native enzyme, the enzyme with bound substrate, and the alkylated enzyme indicate that the mechanism involves an "open-chain" conformation of substrate and that the intermediate in the isomerization reaction is probably a cis-ene diol because the active-site histidine is correctly placed to abstract a proton from C1 or C2 of the substrate. A water molecule binds to C1O and C2O of the substrate and so may act as a proton donor or acceptor in the enolization of a ring-opened substrate.


    Related Citations: 
    • X-Ray Crystal Structure of D-Xylose Isomerase at 4-Angstroms Resolution
      Carrell, H.L.,Rubin, B.H.,Hurley, T.J.,Glusker, J.P.
      (1984) J.Biol.Chem. 259: 3230
    • Comparison of Backbone Structures of Glucose Isomerase from Streptomyces and Arthrobacter
      Henrick, K.,Blow, D.M.,Carrell, H.L.,Glusker, J.P.
      (1987) Protein Eng. 1: 467


    Organizational Affiliation

    Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
XYLOSE ISOMERASE
A
388Streptomyces rubiginosusGene Names: xylA
EC: 5.3.1.5
Find proteins for P24300 (Streptomyces rubiginosus)
Go to UniProtKB:  P24300
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
DFR
Query on DFR

Download SDF File 
Download CCD File 
A
3-DEOXY-3-METHYL-D-FRUCTOSE
C7 H14 O5
DUZROZVFCQUFGS-BNHYGAARSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 93.800α = 90.00
b = 100.000β = 90.00
c = 103.000γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1991-10-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance