1OMZ

crystal structure of mouse alpha-1,4-N-acetylhexosaminyltransferase (EXTL2) in complex with UDPGalNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of an alpha-1,4-N-acetylhexosaminyltransferase (EXTL2), a member of the exostosin gene family involved in heparan sulfate biosynthesis

Pedersen, L.C.Dong, J.Taniguchi, F.Kitagawa, H.Krahn, J.M.Pedersen, L.G.Sugahara, K.Negishi, M.

(2003) J.Biol.Chem. 278: 14420-14428

  • DOI: 10.1074/jbc.M210532200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • EXTL2, an alpha1,4-N-acetylhexosaminyltransferase, catalyzes the transfer reaction of N-acetylglucosamine and N-acetylgalactosamine from the respective UDP-sugars to the non-reducing end of [glucuronic acid]beta1-3[galactose]beta1-O-naphthalenemethan ...

    EXTL2, an alpha1,4-N-acetylhexosaminyltransferase, catalyzes the transfer reaction of N-acetylglucosamine and N-acetylgalactosamine from the respective UDP-sugars to the non-reducing end of [glucuronic acid]beta1-3[galactose]beta1-O-naphthalenemethanol, an acceptor substrate analog of the natural common linker of various glycosylaminoglycans. We have solved the x-ray crystal structure of the catalytic domain of mouse EXTL2 in the apo-form and with donor substrates UDP-N-acetylglucosamine and UDP-N-acetylgalactosamine. In addition, a structure of the ternary complex with UDP and the acceptor substrate analog [glucuronic acid]beta1-3[galactose]beta1-O-naphthalenemethanol has been determined. These structures reveal three highly conserved residues, Asn-243, Asp-246, and Arg-293, located at the active site. Mutation of these residues greatly decreases the activity. In the ternary complex, an interaction exists between the beta-phosphate of the UDP leaving group and the acceptor hydroxyl of the substrate that may play a functional role in catalysis. These structures represent the first structures from the exostosin gene family and provide important insight into the mechanisms of alpha1,4-N-acetylhexosaminyl transfer in heparan biosynthesis.


    Organizational Affiliation

    Pharmacogenetics Section, Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institute of Health, Research Triangle Park, North Carolina 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-1,4-N-acetylhexosaminyltransferase EXTL2
A, B
293Mus musculusMutation(s): 0 
Gene Names: Extl2 (Extr2)
EC: 2.4.1.223
Find proteins for Q9ES89 (Mus musculus)
Go to UniProtKB:  Q9ES89
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
UD2
Query on UD2

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Download CCD File 
A, B
URIDINE-DIPHOSPHATE-N-ACETYLGALACTOSAMINE
(2R,3R,4R,5R,6R)-3-(acetylamino)-4,5-dihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl [(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl dihydrogen diphosphate
C17 H27 N3 O17 P2
LFTYTUAZOPRMMI-NESSUJCYSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 126.339α = 90.00
b = 126.339β = 90.00
c = 83.929γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-22
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description