Tetraspanin-13 modulates voltage-gated CaV2.2 Ca2+ channels

Integration of voltage-gated Ca2+ channels in a network of protein-interactions is a crucial requirement for proper regulation of channel activity. In this study, we took advantage of the specific properties of the yeast split-ubiquitin system to search for and characterize so far unknown interaction partners of CaV2 Ca2+ channels. We identified tetraspanin-13 (TSPAN-13) as an interaction partner of the α1 subunit of N-type CaV2.2, but not of P/Q-type CaV2.1 or L- and T-type Ca2+ channels. Interaction could be located between domain IV of CaV2.2 and transmembrane segments S1 and S2 of TSPAN-13. Electrophysiological analysis revealed that TSPAN-13 specifically modulates the efficiency of coupling between voltage sensor activation and pore opening of the channel and accelerates the voltage-dependent activation and inactivation of the Ba2+ current through CaV2.2. These data indicate that TSPAN-13 might regulate CaV2.2 Ca2+ channel activity in defined synaptic membrane compartments and thereby influences transmitter release.