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The cytotoxic peptide from honeybee venom, melittin, and a synthetic peptide analogue of it lyse human erythrocytes in a biphasic process. The kinetics of the lysis in 0.30 M sucrose, 0.01 M sodium phosphate, pH 7.30 at 4 degrees C were investigated. Our results show that melittin rapidly binds to the outer surface of the erythrocyte membrane, and the surface-bound monomers produce transient openings...
Lipid spin labels have been used to study lipid-protein interactions in bovine and frog rod outer segment disc membranes, in (Na+, K+)-ATPase membranes from shark rectal gland, and in yeast cytochrome oxidase-dimyristoyl phosphatidylcholine complexes. These systems all display a two component ESR spectrum from 14-doxyl lipid spin-labels. One component corresponds to the normal fluid bilayer lipids...
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