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NMR analysis of structure and function of snake neurotoxins

NMR analysis of structure and function of snake neurotoxins The 270‐MHz proton‐nmr spectra of short neurotoxins (erabutoxins from Laticauda semifasciata and cobrotoxin from Naja naja atra) and long neurotoxins (toxin B from Naja naja and α‐bungarotoxin from Bungarus multicinctus) have been analyzed. The conformation of erabutoxin b in solution is largely consistent with the x‐ray crystal analysis, although the environment of His‐7 in solution is definitely different from that in the crystal. The pH‐dependent transition has been found for toxin B, indicating that the conformation in neutral solution is different from that in the crystal as grown from acidic solution. The deuterium‐exchange rates of the amide protons for the four neurotoxins have been measured. The order of structural rigidity is the same as the order of the irreversibility of neuromuscular block by neurotoxins. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biopolymers Wiley

NMR analysis of structure and function of snake neurotoxins

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References (19)

Publisher
Wiley
Copyright
Copyright © 1983 Wiley Subscription Services
ISSN
0006-3525
eISSN
1097-0282
DOI
10.1002/bip.360220122
pmid
6673753
Publisher site
See Article on Publisher Site

Abstract

The 270‐MHz proton‐nmr spectra of short neurotoxins (erabutoxins from Laticauda semifasciata and cobrotoxin from Naja naja atra) and long neurotoxins (toxin B from Naja naja and α‐bungarotoxin from Bungarus multicinctus) have been analyzed. The conformation of erabutoxin b in solution is largely consistent with the x‐ray crystal analysis, although the environment of His‐7 in solution is definitely different from that in the crystal. The pH‐dependent transition has been found for toxin B, indicating that the conformation in neutral solution is different from that in the crystal as grown from acidic solution. The deuterium‐exchange rates of the amide protons for the four neurotoxins have been measured. The order of structural rigidity is the same as the order of the irreversibility of neuromuscular block by neurotoxins.

Journal

BiopolymersWiley

Published: Jan 1, 1983

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