2X63

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 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 ...

    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, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-2,3-/2,8-SIALYLTRANSFERASEA258Campylobacter jejuniMutation(s): 3 
Gene Names: cst-IIB7M65_00010BM513_01020GAU91_01005
EC: 2.4.99
Find proteins for Q9LAK3 (Campylobacter jejuni)
Explore Q9LAK3 
Go to UniProtKB:  Q9LAK3
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C
Query on C

Download Ideal Coordinates CCD File 
C [auth A]CYTIDINE-5'-MONOPHOSPHATE
C9 H14 N3 O8 P
IERHLVCPSMICTF-XVFCMESISA-N
 Ligand Interaction
EDO
Query on EDO

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



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