Interaction between the delta-endotoxin produced by Bacillus thuringiensis ssp. entomocidus and liposomes |
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Authors: | H Yunovitz A Yawetz |
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Affiliation: | Institute for Nature Conservation Research, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel. |
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Abstract: | The δ-endotoxin produced by Bacillus thuringiensis ssp. entomocidus induced the release of encapsulated [14C]sucrose from reverse-phase vesicles composed of phosphatidylcholine and cholesterol. No such release was detected when the phospholipid component of the vesicles was either phosphatidylethanolamine, phosphatidylglycerol, or sphingomyelin. The toxin-induced release was competitively inhibited by negatively charged organic ions while positively charged organic ions, apart from choline chloride, had no such effect. The existence of a polar head group in the phospholipid as well as intermolecular hydrogen bonding at the membrane surface, was found to be of major importance in the toxin-liposome interaction. |
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Keywords: | δ-Endotoxin Sucrose release Reverse-phase vesicle Charged-group inhibition Toxin-receptor interaction (Bacillus thuringiensis ssp. entomocidus, Spodoptera littoralis) |
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