Abstract
Our current understanding of the molecular mechanisms underlying activation of store-operated Ca2+ entry (SOCE) relies in large part on studies that modulate the expression of STIM1 and Orai1. Shen et al. present the first detailed study to address the dynamics and stoichiometry of endogenous STIM1 and Orai1. They argue for an active SOCE cluster centered around a single Orai1 channel per punctum linked to 12 STIM1 dimers, which could have significant implications on SOCE-dependent Ca2+ signaling.
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