1OMZ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.201 

Starting Model: experimental
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This is version 1.4 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: https://doi.org/10.1074/jbc.M210532200
  • Primary Citation of Related Structures:  
    1OMX, 1OMZ, 1ON6, 1ON8

  • 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-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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-1,4-N-acetylhexosaminyltransferase EXTL2
A, B
293Mus musculusMutation(s): 0 
Gene Names: EXTL2 OR EXTR2
EC: 2.4.1
UniProt
Find proteins for Q9ES89 (Mus musculus)
Explore Q9ES89 
Go to UniProtKB:  Q9ES89
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ES89
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.201 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.339α = 90
b = 126.339β = 90
c = 83.929γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-04-22
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description