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The Bestrophin family has been characterized as Cl −  channels in mammals and Na +  channels in bacteria, but their exact physiological roles remian unknown. In this study, a natural C-terminally truncated variant of mouse Bestrophin 3 (Best3V2) expression in myoblasts and muscles is demonstrated. Unlike full-length Best3, Best3V2 targets the two important intracellular Ca stores: the lysosome and the ER. Heterologous overexpression leads to lysosome swelling and renders it less acidic. Best3V2 overexpression also results in compromised Ca 2+  release from the ER. Knocking down endogenous Best3 expression in myoblasts makes these cells more excitable in response to Ca 2+  mobilizing reagents, such as caffeine. We propose that Best3V2 in myoblasts may work as a tuner to control Ca 2+  release from intracellular Ca 2+  stores.

A C-terminally truncated mouse Best3 splice variant targets and alters the ion balance in lysosome-endosome hybrids and the endoplasmic reticulum