2OW7

Golgi alpha-mannosidase II complex with (1R,6S,7R,8S)-1-thioniabicyclo[4.3.0]nonan-7,8-diol chloride


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Binding of sulfonium-ion analogues of di-epi-swainsonine and 8-epi-lentiginosine to Drosophila Golgi alpha-mannosidase II: The role of water in inhibitor binding.

Kumar, N.S.Kuntz, D.A.Wen, X.Pinto, B.M.Rose, D.R.

(2008) Proteins 71: 1484-1496

  • DOI: 10.1002/prot.21850
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Retaining glycosidases operate by a two-step catalytic mechanism in which the transition states are characterized by buildup of a partial positive charge at the anomeric center. Sulfonium-ion analogues of the naturally occurring glycosidase inhibitor ...

    Retaining glycosidases operate by a two-step catalytic mechanism in which the transition states are characterized by buildup of a partial positive charge at the anomeric center. Sulfonium-ion analogues of the naturally occurring glycosidase inhibitors, swainsonine and 8-epi-lentiginosine, in which the bridgehead nitrogen atom is replaced by a sulfonium-ion, were synthesized in order to test the hypothesis that a sulfonium salt carrying a permanent positive charge would be an effective glycosidase inhibitor. Initial prediction based on computational docking indicated three plausible binding modes to Drosophila Golgi alpha-mannosidase II (dGMII), the most likely being close to that of swainsonine. Observation of the binding of di-epi-thioswainsonine and 8-epi-thiolentiginosine to dGMII from crystallographic data, however, revealed an orientation different from swainsonine in the active site. Screening these two compounds against dGMII shows that they are inhibitors with IC(50) values of 2.0 and 0.014 mM, respectively. This dramatic difference in affinity between the two compounds, which differ by only one hydroxyl group, is rationalized in terms of bound water molecules and the water molecule substructure in the active site, as identified by comparison of high resolution X-ray crystal structures of several dGMII-inhibitor complexes.


    Organizational Affiliation

    Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-mannosidase 2
A
1045Drosophila melanogasterMutation(s): 0 
Gene Names: alpha-Man-IIa (GmII)
EC: 3.2.1.114
Find proteins for Q24451 (Drosophila melanogaster)
Go to UniProtKB:  Q24451
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MRD
Query on MRD

Download SDF File 
Download CCD File 
A
(4R)-2-METHYLPENTANE-2,4-DIOL
C6 H14 O2
SVTBMSDMJJWYQN-RXMQYKEDSA-N
 Ligand Interaction
NK2
Query on NK2

Download SDF File 
Download CCD File 
A
(1R,6S,7R,8S)-1-THIONIABICYCLO[4.3.0]NONAN-7,8-DIOL
C8 H15 O2 S
CTIJTKTUZSCTEC-FBSDJGSXSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NK2IC50: 14000 nM BINDINGMOAD
NK2IC50: 14000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 68.900α = 90.00
b = 108.580β = 90.00
c = 137.779γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PROTEUM PLUSdata collection
CNSphasing
SAINTdata reduction
REFMACrefinement
SAINTdata scaling
SADABSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-02-15 
  • Released Date: 2008-01-08 
  • Deposition Author(s): Kuntz, D.A.

Revision History 

  • Version 1.0: 2008-01-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance