1HC9 image
Entry Detail
PDB ID:
1HC9
Keywords:
Title:
alpha-bungarotoxin complexed with high affinity peptide
Biological Source:
PDB Version:
Deposition Date:
2001-05-02
Release Date:
2001-11-10
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.23
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ALPHA-BUNGAROTOXIN ISOFORM V31
Chain IDs:A
Chain Length:74
Number of Molecules:1
Biological Source:BUNGARUS MULTICINCTUS
Polymer Type:polypeptide(L)
Description:ALPHA-BUNGAROTOXIN ISOFORM A31
Chain IDs:B
Chain Length:74
Number of Molecules:1
Biological Source:BUNGARUS MULTICINCTUS
Polymer Type:polypeptide(L)
Description:PEPTIDE INHIBITOR
Chain IDs:C, D
Chain Length:13
Number of Molecules:2
Biological Source:SYNTHETIC CONSTRUCT
Ligand Molecules
Primary Citation
The Binding Site of Acetylcholine Receptor as Visualized in the X-Ray Structure of a Complex between Alpha-Bungarotoxin and a Mimotope Peptide.
Neuron 32 265 ? (2001)
PMID: 11683996 DOI: 10.1016/S0896-6273(01)00461-5

Abstact

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.

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Primary Citation of related structures