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• W1573485994 abstract "A neuronal Ca2+/calmodulin-dependent protein kinase (CaM kinase-Gr) undergoes autophosphorylation on a serine residue(s) in response to Ca2+ and calmodulin. Phosphate incorporation leads to the formation of a Ca(2+)-independent (autonomous) activity state, as well as potentiation of the Ca2+/calmodulin-dependent response. The autonomous enzyme activity of the phosphorylated enzyme approximately equals the Ca2+/calmodulin-stimulated activity of the unphosphorylated enzyme, but displays diminished affinity toward ATP and the synthetic substrate, syntide-2. The Km(app) for ATP and syntide-2 increased 4.3- and 1.7-fold, respectively. Further activation of the autonomous enzyme by Ca2+/calmodulin yields a marked increase in the affinity for ATP and peptide substrate such that the Km(app) for ATP and syntide-2 decreased by 14- and 8-fold, respectively. Both autophosphorylation and the addition of Ca2+/calmodulin are required to produce the maximum level of enzyme activation and to increase substrate affinity. Unlike Ca2+/calmodulin-dependent protein kinase type II that is dephosphorylated by the Mg(2+)-independent phosphoprotein phosphatases 1 and 2A, CaM kinase-Gr is dephosphorylated by a Mg(2+)-dependent phosphoprotein phosphatase that may be related to the type 2C enzyme. Dephosphorylation of CaM kinase-Gr reverses the effects of autophosphorylation on enzyme activity. A comparison between the autophosphorylation and dephosphorylation reactions of CaM kinase-Gr and Ca2+/calmodulin-dependent protein kinase type II provides useful insights into the operation of Ca(2+)-sensitive molecular switches." @default.
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• W1573485994 date "1991-06-01" @default.
• W1573485994 modified "2023-09-30" @default.
• W1573485994 title "A brain-specific Ca2+/calmodulin-dependent protein kinase (CaM kinase-Gr) is regulated by autophosphorylation. Relevance to neuronal Ca2+ signaling" @default.
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• W1573485994 doi "https://doi.org/10.1016/s0021-9258(18)99164-7" @default.
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