1IDH

THE NMR SOLUTION STRUCTURE OF THE COMPLEX FORMED BETWEEN ALPHA-BUNGAROTOXIN AND AN 18MER COGNATE PEPTIDE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: The submitted conformer models are the 20 structures with the lowest energy from 120 acceptable structures which were from 300 total calculated structures and had no restraint violations. The best representative conformer is the lowest potential energy structure of the ensemble. 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The solution structure of the complex formed between alpha-bungarotoxin and an 18-mer cognate peptide derived from the alpha 1 subunit of the nicotinic acetylcholine receptor from Torpedo californica.

Zeng, H.Moise, L.Grant, M.A.Hawrot, E.

(2001) J.Biol.Chem. 276: 22930-22940

  • DOI: 10.1074/jbc.M102300200
  • Primary Citation of Related Structures:  1IDG, 1IDI, 1IDL

  • PubMed Abstract: 
  • The region encompassing residues 181-98 on the alpha1 subunit of the muscle-type nicotinic acetylcholine receptor forms a major determinant for the binding of alpha-neurotoxins. We have prepared an (15)N-enriched 18-amino acid peptide corresponding t ...

    The region encompassing residues 181-98 on the alpha1 subunit of the muscle-type nicotinic acetylcholine receptor forms a major determinant for the binding of alpha-neurotoxins. We have prepared an (15)N-enriched 18-amino acid peptide corresponding to the sequence in this region to facilitate structural elucidation by multidimensional NMR. Our aim was to determine the structural basis for the high affinity, stoichiometric complex formed between this cognate peptide and alpha-bungarotoxin, a long alpha-neurotoxin. Resonances in the complex were assigned through heteronuclear and homonuclear NMR experiments, and the resulting interproton distance constraints were used to generate ensemble structures of the complex. Thr(8), Pro(10), Lys(38), Val(39), Val(40), and Pro(69) in alpha-bungarotoxin and Tyr(189), Tyr(190), Thr(191), Cys(192), Asp(195), and Thr(196) in the peptide participate in major intermolecular contacts. A comparison of the free and bound alpha-bungarotoxin structures reveals significant conformational rearrangements in flexible regions of alpha-bungarotoxin, mainly loops I, II, and the C-terminal tail. Furthermore, several of the calculated structures suggest that cation-pi interactions may be involved in binding. The root mean square deviation of the polypeptide backbone in the complex is 2.07 A. This structure provides, to date, the highest resolution description of the contacts between a prototypic alpha-neurotoxin and its cognate recognition sequence.


    Organizational Affiliation

    Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown Medical School, Providence, Rhode Island 02912, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-BUNGAROTOXIN
A
74Bungarus multicinctusN/A
Find proteins for P60615 (Bungarus multicinctus)
Go to UniProtKB:  P60615
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE RECEPTOR PROTEIN, ALPHA CHAIN
B
19Torpedo californicaGene Names: CHRNA1
Find proteins for P02710 (Torpedo californica)
Go to Gene View: CHRNA1
Go to UniProtKB:  P02710
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HSL
Query on HSL
B
L-PEPTIDE LINKINGC4 H7 N O2SER
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: The submitted conformer models are the 20 structures with the lowest energy from 120 acceptable structures which were from 300 total calculated structures and had no restraint violations. The best representative conformer is the lowest potential energy structure of the ensemble. 
  • Olderado: 1IDH Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance