1SLI

LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH DANA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The crystal structure of an intramolecular trans-sialidase with a NeuAc alpha2-->3Gal specificity.

Luo, Y.Li, S.C.Chou, M.Y.Li, Y.T.Luo, M.

(1998) Structure 6: 521-530

  • DOI: 10.1016/s0969-2126(98)00053-7
  • Primary Citation of Related Structures:  
    1SLI, 1SLL

  • PubMed Abstract: 
  • Intramolecular trans-sialidase from leech (Macrobdella decora) is a unique enzyme which cleaves the terminal neuraminic acid (NeuAc) residue from sialoglycoconjugates, releasing 2, 7-anhydro-neuraminic acid (2,7-anhydro-NeuAc). It is the first enzyme found to exhibit strictly specific cleavage of NeuAc alpha2-->3Gal linkages in sialoglycoconjugates ...

    Intramolecular trans-sialidase from leech (Macrobdella decora) is a unique enzyme which cleaves the terminal neuraminic acid (NeuAc) residue from sialoglycoconjugates, releasing 2, 7-anhydro-neuraminic acid (2,7-anhydro-NeuAc). It is the first enzyme found to exhibit strictly specific cleavage of NeuAc alpha2-->3Gal linkages in sialoglycoconjugates. The release of 2,7-anhydro-NeuAc instead of NeuAc implies a unique mechanism, in which the sialosyl linkage is transferred within the sialoglycoconjugate rather than hydrolyzed. The aims of the structural study were to gain structural insight into the strict specificity and unique mechanism of this unusual enzyme.


    Organizational Affiliation

    Center for Macromolecular Crystallography, University of Alabama at Birmingham, Alabama 35294, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INTRAMOLECULAR TRANS-SIALIDASEA679Macrobdella decoraMutation(s): 0 
Gene Names: T7
EC: 3.2.1.18 (PDB Primary Data), 4.2.2.15 (UniProt)
UniProt
Find proteins for Q27701 (Macrobdella decora)
Explore Q27701 
Go to UniProtKB:  Q27701
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DAN
Query on DAN

Download Ideal Coordinates CCD File 
B [auth A]2-DEOXY-2,3-DEHYDRO-N-ACETYL-NEURAMINIC ACID
C11 H17 N O8
JINJZWSZQKHCIP-UFGQHTETSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.443α = 113.14
b = 69.516β = 95.39
c = 72.514γ = 106.87
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-20
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other