Orai2: Proteins and Enzymes

STIM-Orai channels have recently been identified as the underlying molecular mechanism of store-operated calcium entry(SOCE). SOCE allows rapid Ca2+ efflux from the endoplasmic reticulum (ER), following the emptying of intracellularCa2+ stores. STIM (sensors stromal interaction molecule) proteins, STIM1 and STIM2, serve as ER Ca2+ sensors. Theycontain N'-terminal Ca2+-sensing EF-hand domains and are localized to the tubular ER. Following Ca2+ store depletion,STIMs rapidly cluster and relocalize ...