Matthias Sallinger, Christina Humer, Hwei Ling Ong, Sasirekha Narayanasamy, Qi Tong Lin, Marc Fahrner, Herwig Grabmayr, Sascha Berlansky, Sean Choi, Tony Schmidt, Lena Maltan, Lara Atzgerstorfer, Martin Niederwieser, Irene Frischauf, Christoph Romanin, Peter B Stathopulos, Indu Ambudkar, Romana Leitner, Daniel Bonhenry, Rainer Schindl
The single-pass transmembrane protein Stromal Interaction Molecule 1 (STIM1), located in the endoplasmic reticulum (ER) membrane, possesses two main functions: It senses the ER-Ca2+ concentration and directly binds to the store-operated Ca2+ channel Orai1 for its activation when Ca2+ recedes. At high resting ER-Ca2+ concentration, the ER-luminal STIM1 domain is kept monomeric but undergoes di/multimerization once stores are depleted. Luminal STIM1 multimerization is essential to unleash the STIM C-terminal binding site for Orai1 channels...
May 21, 2024: Proceedings of the National Academy of Sciences of the United States of America