Pre-assembled Ca2+ entry units and constitutively active Ca2+ entry in skeletal muscle of calsequestrin-1 knockout mice

Mice lacking calsequestrin-1 have reduced levels of releasable Ca2+ in the sarcoplasmic reticulum of their skeletal muscles. Michelucci et al. reveal that this is compensated by constitutive assembly of STIM1 and Orai1 into Ca2+ entry units, promoting both constitutive and store-operated Ca2+ entry.

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