STIM2 is a feedback regulator that stabilizes basal cytosolic and endoplasmic reticulum Ca2+ levels.

By Onn Brandman, J. Liou, W. Park, T. Meyer. Cell, 2007

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Handbook of ion channels (2015, background): “This difference likely explains why STIM2, but not STIM1, promotes constitutive activation of SOCE when overexpressed with the ORAI proteins [82,83].”
Molecular Basis of Calcium Signaling in Lymphocytes: STIM and ORAI (2010, background): “STIM1 redistribution in cells shows marked cooperativity with respect to ER-luminal Ca2+ concentration (14, 26).”
Store-Operated Calcium Channels. (2015, neutral): “For example, mutations of the cEF hand that reduce the Ca(2) affinity of STIM1 as well as mutations in the SAM domain that promote STIM1 oligomerization (TABLE 1) evoke constitutive formation of STIM1 puncta (32, 199, 370).”
A Micropeptide Encoded by a Putative Long Non-coding RNA Regulates Muscle Performance (2015, neutral): “SR Ca levels were directly measured using retroviral delivery of the fluorescence resonance energy transfer (FRET)-based, SR-localized Ca sensor T1ER, using culture conditions previously shown to be sensitive to changes in endogenous SERCA activity (Brandman et al., 2007).”
STIM1 Clusters and Activates CRAC Channels via Direct Binding of a Cytosolic Domain to Orai1 (2009, neutral): “…10 mm. coiled-coil and part of the ERM domain of STIM1, is highly conserved among vertebrates and invertebrates from C. elegans to H. sapiens, and is virtually identical to a sequence in STIM2, another ER Ca2+ sensor that controls CRAC channel activation (Brandman et al., 2007) (Figure S2).”