Dataset for Figure 1: Mechanisms of non-Covalent Subunit Regulation of Nav Channel Gating and Pharmacology

Voltage-gated Na+ (NaV) channels comprise a macromolecular complex, whose members tailor their function according to cell type. Key members are the non-covalently bound NaV ?1 and ?3 subunits that regulate channel gating, expression, and pharmacology. To probe the molecular basis of this regulation, we applied voltage-clamp fluorometry to measure how the ?-subunits affect conformations within the cardiac NaV channel (NaV1.5) voltage-sensing domains (VSDs). The pore-forming NaV1.5 ?-subunit contains four domains (DI-DIV), each with a VSD. Our results show that ?1 and ?3 regulate NaV1.5 by altering DIII- and DIV-VSD activation, an interaction that is significantly altered by atrial fibrillation-variants in both ? subunits. ?1 and ?3 strongly affected the interaction of Class Ib anti-arrhythmic drugs, lidocaine and ranolazine, with the DIII-VSD. Our results demonstrate that ?1 and ?3 regulation of the NaV1.5 VSDs can significantly determine NaV1.5 pathology and its therapeutic response.