1HC9

alpha-bungarotoxin complexed with high affinity peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Binding Site of Acetylcholine Receptor as Visualized in the X-Ray Structure of a Complex between Alpha-Bungarotoxin and a Mimotope Peptide.

Harel, M.Kasher, R.Nicolas, A.Guss, J.M.Balass, M.Fridkin, M.Smit, A.B.Brejc, K.Sixma, T.K.Katchalski-Katzir, E.Sussman, J.L.Fuchs, S.

(2001) Neuron 32: 265


  • PubMed Abstract: 
  • We have determined the crystal structure at 1.8 A resolution of a complex of alpha-bungarotoxin with a high affinity 13-residue peptide that is homologous to the binding region of the alpha subunit of acetylcholine receptor. The peptide fits snugly t ...

    We have determined the crystal structure at 1.8 A resolution of a complex of alpha-bungarotoxin with a high affinity 13-residue peptide that is homologous to the binding region of the alpha subunit of acetylcholine receptor. The peptide fits snugly to the toxin and adopts a beta hairpin conformation. The structures of the bound peptide and the homologous loop of acetylcholine binding protein, a soluble analog of the extracellular domain of acetylcholine receptor, are remarkably similar. Their superposition indicates that the toxin wraps around the receptor binding site loop, and in addition, binds tightly at the interface of two of the receptor subunits where it inserts a finger into the ligand binding site, thus blocking access to the acetylcholine binding site and explaining its strong antagonistic activity.


    Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, 76100, Rehovot, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-BUNGAROTOXIN ISOFORM V31
A
74Bungarus multicinctusMutation(s): 0 
Find proteins for P60616 (Bungarus multicinctus)
Go to UniProtKB:  P60616
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ALPHA-BUNGAROTOXIN ISOFORM A31
B
74Bungarus multicinctusMutation(s): 0 
Find proteins for P60615 (Bungarus multicinctus)
Go to UniProtKB:  P60615
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PEPTIDE INHIBITOR
C, D
13N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

Download SDF File 
Download CCD File 
A, B
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.202 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 42.042α = 90.00
b = 153.356β = 90.00
c = 73.263γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-11-10
    Type: Initial release
  • Version 1.1: 2012-06-20
    Type: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2012-12-19
    Type: Database references
  • Version 1.3: 2017-03-22
    Type: Source and taxonomy