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- W2159173485 abstract "The voltage-dependent L-type Ca2+ channel in the heart is regulated by cAMP-dependent protein kinase (PKA) and possibly by protein kinase C (PKC). We have investigated the channel modulation through phosphorylation by these protein kinases, using liposomes into which Ca2+ channels from bovine heart were reconstituted. Phosphorylation of the proteoliposomes with PKA increased the dihydropyridine-sensitive Ca2+ efflux from them by about 70%. PKA rapidly phosphorylated membrane proteins of 210 and 170 kDa. A dihydropyridine-class Ca2+ channel blocker, [3H]azidopine, specifically photo-labeled a protein of 210 kDa, suggesting that the 210-kDa phosphoprotein might be the alpha 1 subunit of the Ca2+ channel. In contrast, phosphorylation of the proteoliposomes with PKC failed to modulate the Ca2+ efflux. Although PKC catalyzed the phosphorylation of membrane proteins of 150, 130, 95, 67, and 62 kDa, the 210- and 170-kDa proteins were not phosphorylated by this kinase. These results suggest that phosphorylation of the 210-kDa protein in the cardiac sarcolemma by PKA may be responsible for modulation of the channel function, whereas modulation of the channel by PKC, if it occurs, must be the result of an indirect mechanism, e.g. phosphorylation of a cytoplasmic protein or an associated channel polypeptide, that cannot function in the reconstituted system." @default.
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- W2159173485 date "1996-07-01" @default.
- W2159173485 modified "2023-09-27" @default.
- W2159173485 title "Cyclic AMP-Dependent Protein Kinase but Not Protein Kinase C Regulates the Cardiac Ca2+ Channel through Phosphorylation of Its 1 Subunit" @default.
- W2159173485 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a021380" @default.
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