Crystal structure of the sialyltransferase CST-II N51A in complex with CMP

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

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Structural and Kinetic Analysis of Substrate Binding to the Sialyltransferase Cst-II from Campylobacter Jejuni.

Lee, H.J.Lairson, L.L.Rich, J.R.Lameignere, E.Wakarchuk, W.W.Withers, S.G.Strynadka, N.C.J.

(2011) J Biol Chem 286: 35922

  • DOI: https://doi.org/10.1074/jbc.M111.261172
  • Primary Citation of Related Structures:  
    2X61, 2X62, 2X63

  • PubMed Abstract: 

    Sialic acids play important roles in various biological processes and typically terminate the oligosaccharide chains on the cell surfaces of a wide range of organisms, including mammals and bacteria. Their attachment is catalyzed by a set of sialyltransferases with defined specificities both for their acceptor sugars and the position of attachment. However, little is known of how this specificity is encoded. The structure of the bifunctional sialyltransferase Cst-II of the human pathogen Campylobacter jejuni in complex with CMP and the terminal trisaccharide of its natural acceptor (Neu5Ac-α-2,3-Gal-β-1,3-GalNAc) has been solved at 1.95 Å resolution, and its kinetic mechanism was shown to be iso-ordered Bi Bi, consistent with its dual acceptor substrate specificity. The trisaccharide acceptor is seen to bind to the active site of Cst-II through interactions primarily mediated by Asn-51, Tyr-81, and Arg-129. Kinetic and structural analyses of mutants modified at these positions indicate that these residues are critical for acceptor binding and catalysis, thereby providing significant new insight into the kinetic and catalytic mechanism, and acceptor specificity of this pathogen-encoded bifunctional GT-42 sialyltransferase.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3; Centre for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-2,3-/2,8-SIALYLTRANSFERASE258Campylobacter jejuniMutation(s): 3 
EC: 2.4.99
Find proteins for Q9LAK3 (Campylobacter jejuni)
Explore Q9LAK3 
Go to UniProtKB:  Q9LAK3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9LAK3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on C

Download Ideal Coordinates CCD File 
C9 H14 N3 O8 P
Query on EDO

Download Ideal Coordinates CCD File 
B [auth A]1,2-ETHANEDIOL
C2 H6 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.19α = 90
b = 116.19β = 90
c = 46.951γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-23
    Type: Initial release
  • Version 1.1: 2011-09-28
    Changes: Database references, Version format compliance
  • Version 1.2: 2011-10-19
    Changes: Database references
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description