Abstract
We report here on the ability of tetanus toxin to induce, at low pH; fusion and aggregation of lipid vesicles containing phosphatidylinositol. It has been shown that diphtheria toxin is internalized in acidic vacuoles (endosomes) and that the low endosomal pH could induce a protein conformational change responsible for the interaction with the endosomal membranes and the toxin translocation into the cytoplasm. The data here reported indicate that tetanus toxin might interact with lipid membrane in a similar way as diphtheria toxin suggesting for the two proteins an identical mechanism of entry into cells.
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