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• W1980486095 endingPage "503" @default.
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• W1980486095 abstract "Calcium/calmodulin dependent protein kinase II delta C (CaMKIIdelta(C)) and the EF-hand Ca(2+)-binding protein, sorcin have both been shown to regulate the excitation-contraction coupling process. This study explores the possibility that these two proteins interact directly and, as a result of this interaction, modulate cardiac calcium handling. Two independent methods (surface plasmon resonance (SPR) and overlay assays) were used to determine whether CaMKIIdelta(C) and sorcin interacted in a direct manner. The nature of this interaction was explored by (i) examining the effects of sorcin on CaMKIIdelta(C) activity using a selective kinase assay and (ii) studying whether sorcin was a substrate for CaMKIIdelta(C) using autoradiography. Ryanodine binding assays on mouse ventricular cardiomyocytes were used to determine specific functional effects of this interaction. SPR studies suggested that sorcin interacts with CaMKIIdelta(C) in a concentration-dependent manner. This interaction occurs in the presence of Ca(2+) and in the presence or absence of calmodulin (CaM). Overlay assays confirmed the existence of this interaction. Further experiments suggested that this interaction is reciprocal. Firstly, sorcin significantly inhibited both recombinant and native CaMKIIdelta(C) activity to similar extents. Secondly, sorcin was phosphorylated by CaMKIIdelta(C). Thirdly, sorcin inhibition of CaMKII activity occurred under conditions where sorcin remained dephosphorylated. Functionally, CaMKIIdelta(C)-mediated phosphorylation of sorcin served to abolish the inhibitory effect of sorcin on ryanodine receptor (RyR(2)) open probability (Po). Since both proteins are capable of directly modulating RyR(2) activity, this interaction may serve as an additional or alternative indirect route by which both proteins can regulate RyR(2) opening status in cardiac myocytes." @default.
• W1980486095 created "2016-06-24" @default.
• W1980486095 creator A5030525094 @default.
• W1980486095 creator A5049130253 @default.
• W1980486095 creator A5072692655 @default.
• W1980486095 creator A5077580391 @default.
• W1980486095 date "2007-10-01" @default.
• W1980486095 modified "2023-09-27" @default.
• W1980486095 title "Interaction of calcium/calmodulin-dependent protein kinase IIδC with sorcin indirectly modulates ryanodine receptor function in cardiac myocytes" @default.
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• W1980486095 doi "https://doi.org/10.1016/j.yjmcc.2007.07.003" @default.
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