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Blockage of Store-Operated Ca2+ Influx by Synta66 is Mediated by Direct Inhibition of the Ca2+ Selective Orai1 Pore.


ABSTRACT: The Ca2+ sensor STIM1 and the Ca2+ channel Orai1 that form the store-operated Ca2+ (SOC) channel complex are key targets for drug development. Selective SOC inhibitors are currently undergoing clinical evaluation for the treatment of auto-immune and inflammatory responses and are also deemed promising anti-neoplastic agents since SOC channels are linked with enhanced cancer cell progression. Here, we describe an investigation of the site of binding of the selective inhibitor Synta66 to the SOC channel Orai1 using docking and molecular dynamics simulations, and live cell recordings. Synta66 binding was localized to the extracellular site close to the transmembrane (TM)1 and TM3 helices and the extracellular loop segments, which, importantly, are adjacent to the Orai1-selectivity filter. Synta66-sensitivity of the Orai1 pore was, in fact, diminished by both Orai1 mutations affecting Ca2+ selectivity and permeation of Na+ in the absence of Ca2+. Synta66 also efficiently blocked SOC in three glioblastoma cell lines but failed to interfere with cell viability, division and migration. These experiments provide new structural and functional insights into selective drug inhibition of the Orai1 Ca2+ channel by a high-affinity pore blocker.

SUBMITTER: Waldherr L 

PROVIDER: S-EPMC7600887 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Blockage of Store-Operated Ca<sup>2+</sup> Influx by Synta66 is Mediated by Direct Inhibition of the Ca<sup>2+</sup> Selective Orai1 Pore.

Waldherr Linda L   Tiffner Adela A   Mishra Deepti D   Sallinger Matthias M   Schober Romana R   Frischauf Irene I   Schmidt Tony T   Handl Verena V   Sagmeister Peter P   Köckinger Manuel M   Derler Isabella I   Üçal Muammer M   Bonhenry Daniel D   Patz Silke S   Schindl Rainer R  

Cancers 20201006 10


The Ca<sup>2+</sup> sensor STIM1 and the Ca<sup>2+</sup> channel Orai1 that form the store-operated Ca<sup>2+</sup> (SOC) channel complex are key targets for drug development. Selective SOC inhibitors are currently undergoing clinical evaluation for the treatment of auto-immune and inflammatory responses and are also deemed promising anti-neoplastic agents since SOC channels are linked with enhanced cancer cell progression. Here, we describe an investigation of the site of binding of the selecti  ...[more]

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