2X61

Crystal structure of the sialyltransferase CST-II in complex with trisaccharide acceptor and CMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.3 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.

(2011) J.Biol.Chem. 286: 35922

  • DOI: 10.1074/jbc.M111.261172
  • Primary Citation of Related Structures:  

  • 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 sialyltr ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-2,3-/2,8-SIALYLTRANSFERASE
A, B
258Campylobacter jejuniMutation(s): 2 
Gene Names: cst-II
Find proteins for Q9LAK3 (Campylobacter jejuni)
Go to UniProtKB:  Q9LAK3
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GAL
Query on GAL

Download SDF File 
Download CCD File 
A, B
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CH
Query on CH

Download SDF File 
Download CCD File 
A, B
N3-PROTONATED CYTIDINE-5'-MONOPHOSPHATE
C9 H15 N3 O8 P
ULTJSGLMABORQB-XVFCMESISA-O
 Ligand Interaction
NGA
Query on NGA

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GALACTOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-JAJWTYFOSA-N
 Ligand Interaction
MPD
Query on MPD

Download SDF File 
Download CCD File 
A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
SIA
Query on SIA

Download SDF File 
Download CCD File 
A, B
O-SIALIC ACID
C11 H19 N O9
SQVRNKJHWKZAKO-YRMXFSIDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.164 
  • Space Group: P 4
Unit Cell:
Length (Å)Angle (°)
a = 117.665α = 90.00
b = 117.665β = 90.00
c = 46.604γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-02
    Type: Initial release
  • Version 1.1: 2011-08-17
    Type: Atomic model, Derived calculations, Non-polymer description
  • Version 1.2: 2011-09-28
    Type: Database references
  • Version 1.3: 2011-10-19
    Type: Database references