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- W2078941920 abstract "Protein kinase A (PKA) phosphorylation of inositol 1,4,5-trisphosphate receptors (InsP(3)Rs) represents a mechanism for shaping intracellular Ca(2+) signals following a concomitant elevation in cAMP. Activation of PKA results in enhanced Ca(2+) release in cells that express predominantly InsP(3)R2. PKA is known to phosphorylate InsP(3)R2, but the molecular determinants of this effect are not known. We have expressed mouse InsP(3)R2 in DT40-3KO cells that are devoid of endogenous InsP(3)R and examined the effects of PKA phosphorylation on this isoform in unambiguous isolation. Activation of PKA increased Ca(2+) signals and augmented the single channel open probability of InsP(3)R2. A PKA phosphorylation site unique to the InsP(3)R2 was identified at Ser(937). The enhancing effects of PKA activation on this isoform required the phosphorylation of Ser(937), since replacing this residue with alanine eliminated the positive effects of PKA activation. These results provide a mechanism responsible for the enhanced Ca(2+) signaling following PKA activation in cells that express predominantly InsP(3)R2." @default.
- W2078941920 created "2016-06-24" @default.
- W2078941920 creator A5006672847 @default.
- W2078941920 creator A5012017298 @default.
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- W2078941920 date "2009-09-01" @default.
- W2078941920 modified "2023-10-16" @default.
- W2078941920 title "Protein Kinase A Increases Type-2 Inositol 1,4,5-Trisphosphate Receptor Activity by Phosphorylation of Serine 937" @default.
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- W2078941920 doi "https://doi.org/10.1074/jbc.m109.010132" @default.
- W2078941920 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2757215" @default.
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