Macromolecule Content

• Total Structure Weight: 9.65 kDa 
• Atom Count: 666 
• Modelled Residue Count: 87 
• Deposited Residue Count: 87 
• Unique protein chains: 2

2BTX

SOLUTION NMR STRUCTURE OF THE COMPLEX OF ALPHA-BUNGAROTOXIN WITH A LIBRARY DERIVED PEPTIDE, NMR, MINIMIZED AVERAGE STRUCTURE

• DOI: 10.2210/pdb2BTX/pdb
• BMRB: 4195

• Classification: COMPLEX (TOXIN/PEPTIDE)
• Organism(s): Bungarus multicinctus
• Mutation(s): No 


• Deposited: 1998-08-23 Released: 1999-01-27 
• Deposition Author(s): Scherf, T., Balass, M., Fuchs, S., Katchalski-Katzir, E., Anglister, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 1 
• Selection Criteria: MINIMIZED AVERAGE STRUCTURE 

Literature

Three-dimensional solution structure of the complex of alpha-bungarotoxin with a library-derived peptide.

Scherf, T., Balass, M., Fuchs, S., Katchalski-Katzir, E., Anglister, J.

(1997) Proc Natl Acad Sci U S A 94: 6059-6064

• PubMed: 9177168 
• DOI: 10.1073/pnas.94.12.6059
• Primary Citation of Related Structures:  
  1BXP, 2BTX


• PubMed Abstract: 
  

The solution structure of the complex between alpha-bungarotoxin (alpha-BTX) and a 13-residue library-derived peptide (MRYYESSLKSYPD) has been solved using two-dimensional proton-NMR spectroscopy. The bound peptide adopts an almost-globular conformation resulting from three turns that surround a hydrophobic core formed by Tyr-11 of the peptide. The peptide fills an alpha-BTX pocket made of residues located at fingers I and II, as well as at the C-terminal region. Of the peptide residues, the largest contact area is formed by Tyr-3 and Tyr-4. These findings are in accord with the previous data in which it had been shown that substitution of these aromatic residues by aliphatic amino acids leads to loss of binding of the modified peptide with alpha-BTX. Glu-5 and Leu-8, which also remarkably contribute to the contact area with the toxin, are present in all the library-derived peptides that bind strongly to alpha-BTX. The structure of the complex may explain the fact that the library-derived peptide binds alpha-BTX with a 15-fold higher affinity than that shown by the acetylcholine receptor peptide (alpha185-196). Although both peptides bind to similar sites on alpha-BTX, the latter adopts an extended conformation when bound to the toxin [Basus, V., Song, G. & Hawrot, E. (1993) Biochemistry 32, 12290-12298], whereas the library peptide is nearly globular and occupies a larger surface area of alpha-BTX binding site.

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Related Citations: 

• The Alpha-Bungarotoxin Binding Site on the Nicotinic Acetylcholine Receptor: Analysis Using a Phage-Epitope Library
  Balass, M., Katchalski-Katzir, E., Fuchs, S.
  (1997) Proc Natl Acad Sci U S A 94: 6054

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-BUNGAROTOXIN	A	74	Bungarus multicinctus	Mutation(s): 0
Find proteins for P60615 (Bungarus multicinctus) Explore P60615  Go to UniProtKB:  P60615

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
LIBRARY DERIVED PEPTIDE	B	13	N/A	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 1 
• Selection Criteria: MINIMIZED AVERAGE STRUCTURE 
• OLDERADO: 2BTX Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-08-23 
• Released Date: 1999-01-27 
Deposition Author(s): Scherf, T., Balass, M., Fuchs, S., Katchalski-Katzir, E., Anglister, J.

Revision History  

• Version 1.0: 1999-01-27
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance