Store-operated calcium entry (SOCE) through STIM-gated ORAI channels governs vital cellular functions. In this context, SOCE controls cellular redox signaling and is itself regulated by redox modifications. However, the molecular mechanisms underlying this calcium-redox interplay and the functional outcomes are not fully understood. Here, we examine the role of STIM2 in SOCE redox regulation. Redox proteomics identify cysteine 313 as the main redox sensor of STIM2 in vitro and in vivo. Oxidative stress suppresses SOCE and calcium currents in cells overexpressing STIM2 and ORAI1, an effect that is abolished by mutation of cysteine 313. FLIM and FRET microscopy, together with MD simulations, indicate that oxidative modifications of cysteine 313 alter STIM2 activation dynamics and thereby hinder STIM2-mediated gating of ORAI1. In summary, this study establishes STIM2-controlled redox regulation of SOCE as a mechanism that affects several calcium-regulated physiological processes, as well as stress-induced pathologies.Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.
About The Expert
Christine Silvia Gibhardt
Sabrina Cappello
Rajesh Bhardwaj
Romana Schober
Sonja Agnes Kirsch
Zuriñe Bonilla Del Rio
Stefan Gahbauer
Anna Bochicchio
Magdalena Sumanska
Christian Ickes
Ioana Stejerean-Todoran
Miso Mitkovski
Dalia Alansary
Xin Zhang
Aram Revazian
Marc Fahrner
Victoria Lunz
Irene Frischauf
Ting Luo
Daria Ezerina
Joris Messens
Vsevolod Vadimovich Belousov
Markus Hoth
Rainer Arnold Böckmann
Matthias Albrecht Hediger
Rainer Schindl
Ivan Bogeski
References
PubMed