Western Blotting and Co-immunoprecipitation of Endogenous STIM/ORAI and Protein Partners.

The characterization of protein-protein interactions through methods such as co-immunoprecipitation, followed by Western blot analysis, is a crucial step in the understanding of protein functions and the biology of the cell. Since the discovery of ORAI and STIM proteins as component of store-operated channel (SOC), overexpressing systems have been used to demonstrate how ORAI and STIM can associate with physiological and pathological conditions. Here we describe a protocol allowing endogenous studies.