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A secretory pathway kinase regulates sarcoplasmic reticulum Ca homeostasis and protects against heart failure. | LitMetric

AI Article Synopsis

Article Abstract

Ca signaling is important for many cellular and physiological processes, including cardiac function. Although sarcoplasmic reticulum (SR) proteins involved in Ca signaling have been shown to be phosphorylated, the biochemical and physiological roles of protein phosphorylation within the lumen of the SR remain essentially uncharacterized. Our laboratory recently identified an atypical protein kinase, Fam20C, which is uniquely localized to the secretory pathway lumen. Here, we show that Fam20C phosphorylates several SR proteins involved in Ca signaling, including calsequestrin2 and Stim1, whose biochemical activities are dramatically regulated by Fam20C mediated phosphorylation. Notably, phosphorylation of Stim1 by Fam20C enhances Stim1 activation and store-operated Ca entry. Physiologically, mice with ablated in cardiomyocytes develop heart failure following either aging or induced pressure overload. We extended these observations to show that non-muscle cells lacking Fam20C display altered ER Ca signaling. Overall, we show that Fam20C plays an overarching role in ER/SR Ca homeostasis and cardiac pathophysiology.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6298778PMC
http://dx.doi.org/10.7554/eLife.41378DOI Listing

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