Identification of a molecular gating determinant within the carboxy terminal region of Cav3.3 T-type channels

oleh: Bohumila Jurkovicova-Tarabova, Leos Cmarko, Renata Rehak, Gerald W. Zamponi, Lubica Lacinova, Norbert Weiss

Format: Article
Diterbitkan: BMC 2019-04-01

Deskripsi

Abstract 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.