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This is the first identification of a Ca 2+ -inhibitable casein kinase (CPK) which we have isolated from the 100 000×g supernatant of Paramecium cell homogenates. The 1000-fold enriched CPK activity depends on millimolar Mg 2+ and is inhibited by low concentrations of heparin or by ≥100 μM Ca 2+ . Enzyme activity is stimulated by polylysine or polyarginine with either casein...
SNAP-25 is a key protein required for the fusion of synaptic vesicles with the plasma membrane during exocytosis. This study establishes that SNAP-25 is differentially phosphorylated by protein kinase C and protein kinase A in neuroendocrine PC12 cells. Using phosphopeptide mapping and site-directed mutagenesis we identified both Thr138 and Ser187 as the targets of SNAP-25 phosphorylation by protein...
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