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• W2017196458 abstract "N- and P/Q-type Ca(2+) channels regulate a number of critical physiological processes including synaptic transmission and hormone secretion. These Ca(2+) channels are multisubunit proteins, consisting of a pore-forming alpha(1), and accessory beta and alpha(2)delta subunits each encoded by multiple genes and splice variants. beta subunits alter current amplitude and kinetics. The beta(2a) subunit is associated with slowed inactivation, an effect that requires the palmitoylation of two N-terminal cysteine residues in beta(2a). In the current manuscript, we studied steady state inactivation properties of native N- and P/Q-type Ca(2+) channels and recombinant N-type Ca(2+) channels. When bovine alpha(1B) and beta(2a) and human alpha(2)delta were coexpressed in tsA 201 cells, we observed significant variations in inactivation; some cells exhibited virtually no inactivation as the holding potential was altered whereas others exhibited significant inactivation. A similar variability in inactivation was observed in native channels from bovine chromaffin cells. In individual chromaffin cells, the amount of inactivation exhibited by N-type channels was correlated with the inactivation of P/Q-type channels, suggesting a shared mechanism. Our results with recombinant channels with known beta subunit composition indicated that inactivation could be dynamically regulated, possibly by alterations in beta subunit palmitoylation. Tunicamycin, which inhibits palmitoylation, increased steady-state inactivation of Ca(2+) channels in chromaffin cells. Cerulenin, another drug that inhibits palmitoylation, also increased inactivation. Tunicamycin produced a similar effect on recombinant N-type Ca(2+) channels containing beta(2a) but not beta(2b) or beta(2a) subunits mutated to be palmitoylation deficient. Our results suggest that Ca(2+) channels containing beta(2a) subunits may be regulated by dynamic palmitoylation." @default.
• W2017196458 created "2016-06-24" @default.
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• W2017196458 date "2000-07-18" @default.
• W2017196458 modified "2023-09-25" @default.
• W2017196458 title "The role of dynamic palmitoylation in Ca ²⁺ channel inactivation" @default.
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• W2017196458 doi "https://doi.org/10.1073/pnas.160589697" @default.
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