2BTX

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

Summary for 2BTX

• Entry DOI: 10.2210/pdb2btx/pdb
• NMR Information: BMRB: 4195
• Descriptor: ALPHA-BUNGAROTOXIN, LIBRARY DERIVED PEPTIDE (2 entities in total)
• Functional Keywords: complex (toxin-peptide), alpha-bungarotoxin, library peptide, complex (toxin-peptide) complex, complex (toxin/peptide)
• Biological source: Bungarus multicinctus (many-banded krait)
• Cellular location: Secreted: P60615
• Total number of polymer chains: 2
• Total formula weight: 9646.09

Authors

Scherf, T.,Balass, M.,Fuchs, S.,Katchalski-Katzir, E.,Anglister, J. (deposition date: 1998-08-23, release date: 1999-01-27, Last modification date: 2024-10-23)

Primary citation

Scherf, T.,Balass, M.,Fuchs, S.,Katchalski-Katzir, E.,Anglister, J.
Three-dimensional solution structure of the complex of alpha-bungarotoxin with a library-derived peptide.
Proc.Natl.Acad.Sci.USA, 94:6059-6064, 1997

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.

PubMed: 9177168
DOI: 10.1073/pnas.94.12.6059

Experimental method

SOLUTION NMR