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• W2016516993 abstract "Munc18-1 is a mammalian member of the SEC1 protein family implicated in neuronal secretion. Its sequence contains several consensus sites for phosphorylation by protein kinase C (PKC), a kinase known to enhance secretion. We have characterized the phosphorylation of the synaptic munc18-1 pool by endogenous, presynaptic PKC-isoforms. In isolated rat brain nerve terminals, munc18-1 was almost completely nonphosphorylated. Its phosphorylation state increased by 250% on inhibition of endogenous phosphatases and by 1500% on additional, direct PKC activation using phorbol esters. K+-evoked depolarization also increased munc18-1 phosphorylation, by 50% within 5 s in a Ca2+-dependent manner. Munc18-1 phosphorylation in nerve terminals was blocked by PKC inhibitors. Activation of endogenous PKC in nerve terminals inhibited the interaction of synaptic munc18-1 with its binding partner syntaxin-1A by 50%. Munc18-1 antisera precipitated 80% of native, brain-derived munc18-1 from salt solutions, but only 12% from synaptosomal lysates, together with 6% synaptic syntaxin-1A/B; these amounts were not changed by PKC activation. In this 12%, the phosphate incorporation per mole of munc18 was four-fold lower than the total pool. We conclude that the synaptic munc18-1 pool can be readily and rapidly phosphorylated by endogenous presynaptic PKC isoforms. A high constitutive phosphatase activity keeps its basal phosphorylation state low so that PKC activation can increase the phosphorylation state dramatically. These phosphorylation dynamics and the effects on the interaction with syntaxin-1A make munc18-1 a prominent candidate to account for PKC-dependent enhancement of secretion." @default.
• W2016516993 created "2016-06-24" @default.
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• W2016516993 date "2000-01-01" @default.
• W2016516993 modified "2023-10-18" @default.
• W2016516993 title "Dynamics of munc18-1 phosphorylation/dephosphorylation in rat brain nerve terminals" @default.
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• W2016516993 doi "https://doi.org/10.1046/j.1460-9568.2000.00931.x" @default.
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