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• W2082382868 abstract "Mojave toxin, the principal toxic component of the venom of the Mojave rattlesnake Crotalus scutulatus scutulatus, is a protein complex of about 22,000 mol. wt. The mechanism of action of this potent (LD50 = 0.039 μg/g, mouse, IV) neurotoxin is a matter of conjecture, but physiologic data suggest a presynaptic site of action with disruption of stimulus-secretion coupling and neurotransmitter release. The selectivity of Mojave toxin's effect on several ion channels involved in neurotransmission was assessed in the present study using competitive radioisotopic binding procedures. Synaptic membranes from rat brain were used to assess the toxin's interaction with Ca++ and Cl− channels while membrane fragments from the Torpedo fish electric organ were used to determine toxin interaction with the nicotinic acetylcholine receptor-coupled Na+ channel. Mojave toxin was found to irreversibly inhibit 3H-nitrendipine binding to dihydropyridine receptors associated with Ca++ channels in rat brain, but had no effect on radioligand binding in the Na+ and Cl− channel assays. Saturation analysis of the binding further showed that the effects of MoTX on dihydropyridine binding were noncompetitive, with MoTX producing a decrease in both the affinity and density of 3H-nitrendipine sites. These results are consistent with the hypothesis that MoTX acts selectively on Ca++ channel function and that this interaction occurs via an allosteric mechanism in which MoTX binds to a membrane site that is topologically distinct from the dihydropyridine receptor." @default.
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• W2082382868 date "1989-03-01" @default.
• W2082382868 modified "2023-09-27" @default.
• W2082382868 title "Inhibition of calcium channel dihydropyridine receptor binding by purified Mojave toxin" @default.
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• W2082382868 doi "https://doi.org/10.1016/0892-0362(89)90051-2" @default.
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