Abstract
Proton n.m.r. spectra at 360 MHz of neurotoxin II and cardiotoxin V II4 from the venom of Naja mossambica mossambica are reported. From the n.m.r. spectra the solution conformations of the two proteins seem to be quite closely related. However, the exchange rates of the n.m.r. observable labile protons with deuterium of the solvent were markedly different, showing that the molecular structure of the cardiotoxin must be more flexible than that of the neurotoxin and suggesting that the different functional properties of the two toxins might be related to the different molecular dynamics.
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