Stromal Interaction Molecule 2 (STIM2) Antibody – Rabbit Polyclonal

This gene is a member of the stromal interaction molecule (STIM) family and likely arose, along with related family member STIM1, from a common ancestral gene. The encoded protein functions to regulate calcium concentrations in the cytosol and endoplasmic reticulum, and is involved in the activation of plasma membrane Orai Ca(2+) entry channels. This gene initiates translation from a non-AUG (UUG) start site. A signal peptide is cleaved from the resulting protein. Multiple transcript variants result from alternative splicing. [provided by RefSeq, Dec 2009]

STIM2: Plays a role in mediating store-operated Ca(2+) entry (SOCE), a Ca(2+) influx following depletion of intracellular Ca(2+) stores. Functions as a highly sensitive Ca(2+) sensor in the endoplasmic reticulum which activates both store-operated and store-independent Ca(2+)-influx. Regulates basal cytosolic and endoplasmic reticulum Ca(2+) concentrations. Upon mild variations of the endoplasmic reticulum Ca(2+) concentration, translocates from the endoplasmic reticulum to the plasma membrane where it probably activates the Ca(2+) release-activated Ca(2+) (CRAC) channels ORAI1, ORAI2 and ORAI3. May inhibit STIM1-mediated Ca(2+) influx. Oligomer with STIM1. Interacts with ORAI1. Expressed in all tissues and tumor cell lines examined.

Protein type: Cell adhesion; Membrane protein, integral

Chromosomal Location of Human Ortholog: 4p15.2

Cellular Component: endoplasmic reticulum membrane; endoplasmic reticulum; integral to membrane; plasma membrane

Molecular Function: store-operated calcium channel activity; protein binding; calcium channel regulator activity; calcium ion binding

Biological Process: cellular calcium ion homeostasis; activation of store-operated calcium channel activity; positive regulation of calcium ion transport