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- W2085382074 abstract "Fifty to eighty-five percent of the ATPase activity in different preparations of cholinergic synaptic vesicles isolated from Torpedo electric organ was half-inhibited by 7 microM vanadate. This activity is due to a recently purified phosphointermediate, or P-type, ATPase, Acetylcholine (ACh) active transport by the vesicles was stimulated about 35% by vanadate, demonstrating that the P-type enzyme is not the proton pump responsible for ACh active transport. Nearly all of the vesicle ATPase activity was inhibited by N-ethylmaleimide. The P-type ATPase could be protected from N-ethylmaleimide inactivation by vanadate, and subsequently reactivated by complexation of vanadate with deferoxamine. The inactivation-protection pattern suggests the presence of a vanadate-insensitive, N-ethylmaleimide-sensitive ATPase consistent with a vacuolar, or V-type, activity expected to drive ACh active transport. ACh active transport was half-inhibited by 5 microM N-ethylmaleimide, even in the presence of vanadate. The presence of a V-type ATPase was confirmed by Western blots using antisera raised against three separate subunits of chromaffin granule vacuolar ATPase I. Both ATPase activities, the P-type polypeptides, and the 38-kilodalton polypeptide of the V-type ATPase precisely copurify with the synaptic vesicles. Solubilization of synaptic vesicles in octaethyleneglycol dodecyl ether detergent results in several-fold stimulation of the P-type activity and inactivation of the V-type activity, thus explaining why the V-type activity was not detected previously during purification of the P-type ATPase. It is concluded that cholinergic vesicles contain a P-type ATPase of unknown function and a V-type ATPase which is the proton pump." @default.
- W2085382074 created "2016-06-24" @default.
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- W2085382074 date "1989-11-01" @default.
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- W2085382074 title "Cholinergic Synaptic Vesicles Contain a V-Type and a P-Type ATPase" @default.
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- W2085382074 doi "https://doi.org/10.1111/j.1471-4159.1989.tb08525.x" @default.
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