Abstract
Theta-toxin (perfringolysin O) modified by diethyl pyrocarbonate, a histidine-specific reagent, lost its hemolytic activity. The modified toxin retains the activities of binding to and insertion into cholesterol-containing membranes but lacks the ability to form oligomers. These results suggest that histidine residues of theta-toxin contribute their share to cytolysis, especially the oligomerization process.
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