Molecular Brain, 2019
Jurkovicova-Tarabova, B., Cmarko, L., Rehak, R., Zamponi, G., Lacinová, Ľ., & Weiss, N. (2019). Identification of a molecular gating determinant within the carboxy terminal region of Cav3.3 T-type channels. Molecular Brain.
Jurkovicova-Tarabova, Bohumila, Leos Cmarko, R. Rehak, G. Zamponi, Ľ. Lacinová, and N. Weiss. “Identification of a Molecular Gating Determinant within the Carboxy Terminal Region of Cav3.3 T-Type Channels.” Molecular Brain (2019).
Jurkovicova-Tarabova, Bohumila, et al. “Identification of a Molecular Gating Determinant within the Carboxy Terminal Region of Cav3.3 T-Type Channels.” Molecular Brain, 2019.
The physiological functions controlled by T-type channels are intrinsically dependent on their gating properties, and alteration of T-type channel activity is linked to several human disorders. Therefore, it is essential to develop a clear understanding of the structural determinants responsible for the unique gating features of T-type channels. Here, we have investigated the specific role of the carboxy terminal region by creating a series a deletion constructs expressed in tsA-201 cells and analyzing them by patch clamp electrophysiology. Our data reveal that the proximal region of the carboxy terminus contains a structural determinant essential for shaping several gating aspects of Cav3.3 channels, including voltage-dependence of activation and inactivation, inactivation kinetics, and coupling between the voltage sensing and the pore opening of the channel. Altogether, our data are consistent with a model in which the carboxy terminus stabilizes the channel in a closed state.