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Membrane interactions of tetradecapeptide toxin mastoparan (MP) and analogues (MP-3, MP-X and polistes MP), as indicated by inhibition of various enzymatic and cellular activities, were investigated. MP-3 was found to be the least active in inhibiting protein kinase C (PKC; activated by phosphatidylserine vesicles, synaptosomal membranes or phorbol ester), synaptosomal membrane Na.K-ATPase and proliferation...
The effects of a number of polypeptide cytotoxins and neurotoxins on various protein kinases were examined. It was found that cobra cytotoxin I and marine worm cytotoxin A-IV effectively and specifically inhibited phospholipid-sensitive Ca 2+ -dependent protein kinase (PL-Ca-PK) relative to myosin light chain kinase and cyclic nucleotide-dependent protein kinases. Inhibition of PL-Ca-PK...
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