3D51

GOLGI MANNOSIDASE II complex with gluco-hydroxyiminolactam


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.43 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural analysis of Golgi alpha-mannosidase II inhibitors identified from a focused glycosidase inhibitor screen.

Kuntz, D.A.Tarling, C.A.Withers, S.G.Rose, D.R.

(2008) Biochemistry 47: 10058-10068

  • DOI: 10.1021/bi8010785
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The N-glycosylation pathway is a target for pharmaceutical intervention in a number of pathological conditions including cancer. Golgi alpha-mannosidase II (GMII) is the final glycoside hydrolase in the pathway and has been the target for a number of ...

    The N-glycosylation pathway is a target for pharmaceutical intervention in a number of pathological conditions including cancer. Golgi alpha-mannosidase II (GMII) is the final glycoside hydrolase in the pathway and has been the target for a number of synthetic efforts aimed at providing more selective and effective inhibitors. Drosophila GMII (dGMII) has been extensively studied due to the ease of obtaining high resolution structural data, allowing the observation of substrate distortion upon binding and after formation of a trapped covalent reaction intermediate. However, attempts to find new inhibitor leads by high-throughput screening of large commercial libraries or through in silico docking were unsuccessful. In this paper we provide a kinetic and structural analysis of five inhibitors derived from a small glycosidase-focused library. Surprisingly, four of these were known inhibitors of beta-glucosidases. X-ray crystallographic analysis of the dGMII:inhibitor complexes highlights the ability of the zinc-containing GMII active site to deform compounds, even ones designed as conformationally restricted transition-state mimics of beta-glucosidases, into binding entities that have inhibitory activity. Although these deformed conformations do not appear to be on the expected conformational itinerary of the enzyme, and are thus not transition-state mimics of GMII, they allow positioning of the three vicinal hydroxyls of the bound gluco-inhibitors into similar locations to those found with mannose-containing substrates, underlining the importance of these hydrogen bonds for binding. Further, these studies show the utility of targeting the acid-base catalyst using appropriately positioned positively charged nitrogen atoms, as well as the challenges associated with aglycon substitutions.


    Organizational Affiliation

    Ontario Cancer Institute, Canada.




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 3 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
GOX
Query on GOX

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Download CCD File 
A
(2S,3S,4R,5R)-6-(HYDROXYAMINO)-2-(HYDROXYMETHYL)-2,3,4,5-TETRAHYDROPYRIDINE-3,4,5-TRIOL
D-GLUCONHYDROXIMO-1,5-LACTAM
C6 H12 N2 O5
VBXHGXTYZGYTQG-SQOUGZDYSA-N
 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
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
GOXKi: 70000 nM BINDINGMOAD
GOXKi: 70000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.43 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 68.739α = 90.00
b = 109.118β = 90.00
c = 137.694γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
REFMACrefinement
HKL-2000data reduction
ADSCdata collection
SADABSdata scaling
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-08-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2019-07-24
    Type: Advisory, Data collection, Refinement description