Abstract

Marker release from liposomes induced by the cytolytic protein Cerebratulus lacteus toxin A-III was studied. No phospholipid specificity was apparent, but the sensitivity of liposomes to A-III varied with the membrane fluidity. With dioleylphosphatidylcholine liposomes, complete release occurred at 10–20 μg toxin per ml, depending on marker size. Kinetic experiments showed that release was rapid and exhibited no lag phase. The diameter of the A-III produced membrane lesion must exceed 90 Å, as tetrameric Concanavalin A is quantitatively released from A-III treated liposomes.

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