Ion-channel blocker sensitivity of voltage-gated calcium-channel homologue Cch1 in Saccharomyces cerevisiae
Teng, Jinfeng and Goto, Rika and Iida, Kazuko and Kojima, Itaru and Iida, Hidetoshi,, 154, 3775-3781 (2008),
doi = https://doi.org/10.1099/mic.0.2008/021089-0,
publicationName = Microbiology Society,
issn = 1350-0872,
abstract= The Cch1 protein of the yeast Saccharomyces cerevisiae is a homologue of the pore-forming α 1 subunit of mammalian voltage-gated Ca2+ channels (VGCCs), and it constitutes a high-affinity Ca2+-influx system with the Mid1 protein in this organism. Here, we characterized the kinetic property of a putative Cch1–Mid1 Ca2+ channel overexpressed in S. cerevisiae cells, and showed that the L-type VGCC blockers nifedipine and verapamil partially inhibited Cch1–Mid1 activity, but typical P/Q-, N-, R- and T-type VGCC blockers did not inhibit activity. In contrast, a third L-type VGCC blocker, diltiazem, increased Cch1–Mid1 activity. Diltiazem did not increase Ca2+ uptake in the cch1Δ and mid1Δ single mutants and the cch1Δ mid1Δ double mutant, indicating that the diltiazem-induced increase in Ca2+ uptake is completely dependent on Cch1–Mid1. These results suggest that Cch1 is pharmacologically similar to L-type VGCCs, but the interactions between Cch1 and the L-type VGCC blockers are more complicated than expected.,
language=,
type=