In T lymphocytes, the sole pathway for Ca++ entry following antigen-receptor binding is through store-operated Ca++- release-activated Ca++ (CRAC) channels (reviewed in 1).
These channels are made up of the pore-forming subunit ORAI1 (2) and the stromal interaction molecule 1 (STIM1), a protein that functions as a Ca++ sensor and activates the CRAC channels, migrating to the plasma membrane from endoplasmic reticulum (ER)-like sites which act as the Ca++ store (3,4).
A related molecule, STIM2, acts to inhibit the STIM1-mediated store-operated Ca++ entry, and can form complexes with STIM1, suggesting they may play acoordinated role in controlling Ca++ entry (5).
At least two isoforms of STIM1 are known to exist; this antibody will detect only the larger form.
This STIM1 antibody is predictedto have no cross-reactivity to STIM2.
Applications:Suitable for use in ELISA, Western Blot and Immunohistochemistry.
Other applications not tested.
Recommended Dilution:Western Blot: 1-2 ug/ml
Immunohistochemistry: 2.5ug/mlOptimal dilutions to be determined by the researcher.