CaV1.1 voltage-sensing domain III exclusively controls skeletal muscle excitation-contraction coupling

Simone Pelizzari, Martin C. Heiss, Monica L. Fernández-Quintero, Yousra El Ghaleb, Klaus R. Liedl, Petronel Tuluc, Marta Campiglio and Bernhard E. Flucher ()
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Simone Pelizzari: Medical University Innsbruck
Martin C. Heiss: Medical University Innsbruck
Monica L. Fernández-Quintero: University of Innsbruck
Yousra El Ghaleb: Medical University Innsbruck
Klaus R. Liedl: University of Innsbruck
Petronel Tuluc: University of Innsbruck
Marta Campiglio: Medical University Innsbruck
Bernhard E. Flucher: Medical University Innsbruck

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Skeletal muscle contractions are initiated by action potentials, which are sensed by the voltage-gated calcium channel (CaV1.1) and are conformationally coupled to calcium release from intracellular stores. Notably, CaV1.1 contains four separate voltage-sensing domains (VSDs), which activate channel gating and excitation-contraction (EC-) coupling at different voltages and with distinct kinetics. Here we show that a single VSD of CaV1.1 controls skeletal muscle EC-coupling. Whereas mutations in VSDs I, II and IV affect the current properties but not EC-coupling, only mutations in VSD III alter the voltage-dependence of depolarization-induced calcium release. Molecular dynamics simulations reveal comprehensive, non-canonical state transitions of VSD III in response to membrane depolarization. Identifying the voltage sensor that activates EC-coupling and detecting its unique conformational changes opens the door to unraveling the downstream events linking VSD III motion to the opening of the calcium release channel, and thus resolving the signal transduction mechanism of skeletal muscle EC-coupling.

Date: 2024
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DOI: 10.1038/s41467-024-51809-5

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