1G9C

CRYSTAL STRUCTURE OF CLOSTRIDIUM BOTULINUM NEUROTOXIN B COMPLEXED WITH AN INHIBITOR (EXPERIMENT 4)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Novel Mechanism for Clostridium botulinum Neurotoxin Inhibition

Eswaramoorthy, S.Kumaran, D.Swaminathan, S.

(2002) BIOCHEMISTRY 41: 9795-9802

  • Primary Citation of Related Structures:  1G9A, 1G9B, 1G9D

  • PubMed Abstract: 
  • Clostridium botulinum neurotoxins are zinc endopeptidase proteins responsible for cleaving specific peptide bonds of proteins of neuroexocytosis apparatus. The ability of drugs to interfere with toxin's catalytic activity is being evaluated with zinc ...

    Clostridium botulinum neurotoxins are zinc endopeptidase proteins responsible for cleaving specific peptide bonds of proteins of neuroexocytosis apparatus. The ability of drugs to interfere with toxin's catalytic activity is being evaluated with zinc chelators and metalloprotease inhibitors. It is important to develop effective pharmacological treatment for the intact holotoxin before the catalytic domain separates and enters the cytosol. We present here evidence for a novel mechanism of an inhibitor binding to the holotoxin and for the chelation of zinc from our structural studies on Clostridium botulinum neurotoxin type B in complex with a potential metalloprotease inhibitor, bis(5-amidino-2-benzimidazolyl)methane, and provide snapshots of the reaction as it progresses. The binding and inhibition mechanism of this inhibitor to the neurotoxin seems to be unique for intact botulinum neurotoxins. The environment of the active site rearranges in the presence of the inhibitor, and the zinc ion is gradually removed from the active site and transported to a different site in the protein, probably causing loss of catalytic activity.


    Related Citations: 
    • Crystallization and Preliminary X-ray Analysis of Clostridium botulinum Neurotoxin Type B
      Swaminathan, S.,Eswaramoorthy, S.
      (2000) Acta Crystallogr.,Sect.D 56: 1024
    • Structural Analysis of the Catalytic and Binding Sites of Clostridium botulinum Neurotoxin B
      Swaminathan, S.,Eswaramoorthy, S.
      (2000) Nat.Struct.Mol.Biol. 7: 693


    Organizational Affiliation

    Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BOTULINUM NEUROTOXIN TYPE B
A
1290Clostridium botulinumGene Names: botB
EC: 3.4.24.69
Find proteins for P10844 (Clostridium botulinum)
Go to UniProtKB:  P10844
Small Molecules
Ligands 2 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
BAB
Query on BAB

Download SDF File 
Download CCD File 
A
BIS(5-AMIDINO-BENZIMIDAZOLYL)METHANE
C17 H19 N8
QZKOOEFIMWKZPK-UHFFFAOYSA-Q
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BABIC50: ~7500 nM BINDINGMOAD
BABIC50: 5000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 74.730α = 90.00
b = 122.470β = 112.67
c = 94.250γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-11-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance