Molecular mechanisms of STIM/Orai communication

American Journal of Physiology. Cell Physiology
Isabella DerlerChristoph Romanin

Abstract

Ca(2+)entry into the cell via store-operated Ca(2+)release-activated Ca(2+)(CRAC) channels triggers diverse signaling cascades that affect cellular processes like cell growth, gene regulation, secretion, and cell death. These store-operated Ca(2+)channels open after depletion of intracellular Ca(2+)stores, and their main features are fully reconstituted by the two molecular key players: the stromal interaction molecule (STIM) and Orai. STIM represents an endoplasmic reticulum-located Ca(2+)sensor, while Orai forms a highly Ca(2+)-selective ion channel in the plasma membrane. Functional as well as mutagenesis studies together with structural insights about STIM and Orai proteins provide a molecular picture of the interplay of these two key players in the CRAC signaling cascade. This review focuses on the main experimental advances in the understanding of the STIM1-Orai choreography, thereby establishing a portrait of key mechanistic steps in the CRAC channel signaling cascade. The focus is on the activation of the STIM proteins, the subsequent coupling of STIM1 to Orai1, and the consequent structural rearrangements that gate the Orai channels into the open state to allow Ca(2+)permeation into the cell.

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Methods Mentioned

BETA
NMR
X-ray
FRET
LRET
coimmunoprecipitation
cross-linking studies

Software Mentioned

STIMATE
SCDI

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