2IHZ

Crystal structure of multifunctional sialyltransferase from pasteurella multocida with CMP-3F-Neu5Ac and alpha-lactose bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

Starting Model: experimental
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This is version 2.1 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: https://doi.org/10.1021/bi700346w
  • Primary Citation of Related Structures:  
    2IHJ, 2IHK, 2IHZ, 2ILV

  • 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 (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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-2,3/2,6-sialyltransferase/sialidase399Pasteurella multocidaMutation(s): 0 
Gene Names: Pm0188
EC: 2.4.99.4
UniProt
Find proteins for Q15KI8 (Pasteurella multocida)
Explore Q15KI8 
Go to UniProtKB:  Q15KI8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15KI8
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-alpha-D-glucopyranose
B
2N/A
Glycosylation Resources
GlyTouCan:  G88362QR
GlyCosmos:  G88362QR
GlyGen:  G88362QR
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CSF
Query on CSF

Download Ideal Coordinates CCD File 
C [auth A]CYTIDINE-5'-MONOPHOSPHATE-3-FLUORO-N-ACETYL-NEURAMINIC ACID
C20 H30 F N4 O16 P
HNJLGUNKGJTPBF-JTKQZVQZSA-N
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.482α = 90
b = 64.532β = 99.03
c = 64.41γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PROTEUM PLUSdata collection
PROTEUM PLUSdata reduction
PROTEUM PLUSdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary