2ILV

crystal structure of multifunctional sialyltransferase from Pasteurella multocida with CMP and alpha-lactose bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of Pasteurella multocida Sialyltransferase Complexes with Acceptor and Donor Analogues Reveal Substrate Binding Sites and Catalytic Mechanism.

Ni, L.Chokhawala, H.A.Cao, H.Henning, R.Ng, L.Huang, S.Yu, H.Chen, X.Fisher, A.J.

(2007) Biochemistry 46: 6288-6298

  • DOI: 10.1021/bi700346w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Sialyltransferases are key enzymes involved in the biosynthesis of biologically and pathologically important sialic acid-containing molecules in nature. Binary X-ray crystal structures of a multifunctional Pasteurella multocida sialyltransferase (Del ...

    Sialyltransferases are key enzymes involved in the biosynthesis of biologically and pathologically important sialic acid-containing molecules in nature. Binary X-ray crystal structures of a multifunctional Pasteurella multocida sialyltransferase (Delta24PmST1) with a donor analogue CMP-3F(a)Neu5Ac or CMP-3F(e)Neu5Ac were determined at 2.0 and 1.9 A resolutions, respectively. Ternary X-ray structures of the protein in complex with CMP or a donor analogue CMP-3F(a)Neu5Ac and an acceptor lactose have been determined at 2.0 and 2.27 A resolutions, respectively. This represents the first sialyltransferase structure and the first GT-B-type glycosyltransferase structure that is bound to both a donor analogue and an acceptor simultaneously. The four structures presented here reveal that binding of the nucleotide-activated donor sugar causes a buried tryptophan to flip out of the protein core to interact with the donor sugar and helps define the acceptor sugar binding site. Additionally, key amino acid residues involved in the catalysis have been identified. Structural and kinetic data support a direct displacement mechanism involving an oxocarbenium ion-like transition state assisted with Asp141 serving as a general base to activate the acceptor hydroxyl group.


    Organizational Affiliation

    Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-2,3/2,6-sialyltransferase/sialidase
A
400Pasteurella multocidaMutation(s): 0 
Find proteins for Q15KI8 (Pasteurella multocida)
Go to UniProtKB:  Q15KI8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C5P
Query on C5P

Download SDF File 
Download CCD File 
A
CYTIDINE-5'-MONOPHOSPHATE
C9 H14 N3 O8 P
IERHLVCPSMICTF-XVFCMESISA-N
 Ligand Interaction
LBT
Query on LBT

Download SDF File 
Download CCD File 
A
ALPHA-LACTOSE
C12 H22 O11
GUBGYTABKSRVRQ-XLOQQCSPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.912α = 90.00
b = 63.627β = 98.36
c = 63.782γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
HKL-2000data collection
REFMACrefinement
MOSFLMdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-10-03 
  • Released Date: 2007-05-22 
  • Deposition Author(s): Fisher, A.J., Ni, L.

Revision History 

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance