1ON6

Crystal structure of mouse alpha-1,4-N-acetylhexosaminotransferase (EXTL2) in complex with UDPGlcNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.196 

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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
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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: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.196 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.064α = 90
b = 126.064β = 90
c = 83.936γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing

Structure Validation

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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