Conservation of Ca2+/calmodulin regulation across Na and Ca 2+ channels

Manu Ben-Johny, Philemon S. Yang, Jacqueline Niu, Wanjun Yang, Rosy Joshi-Mukherjee, David T. Yue

Research output: Contribution to journalArticlepeer-review

Abstract

Voltage-gated Na and Ca2+ channels comprise distinct ion channel superfamilies, yet the carboxy tails of these channels exhibit high homology, hinting at a long-shared and purposeful module. For different Ca2+ channels, carboxyl-tail interactions with calmodulin do elaborate robust and similar forms of Ca2+ regulation. However, Na channels have only shown subtler Ca2+ modulation that differs among reports, challenging attempts at unified understanding. Here, by rapid Ca2+ photorelease onto Na channels, we reset this view of Na channel regulation. For cardiac-muscle channels (NaV1.5), reported effects from which most mechanistic proposals derive, we observe no Ca2+ modulation. Conversely, for skeletal-muscle channels (NaV1.4), we uncover fast Ca2+ regulation eerily similar to that of Ca2+ channels. Channelopathic myotonia mutations halve NaV1.4 Ca2+ regulation, and transplanting the NaV1.4 carboxy tail onto Ca 2+ channels recapitulates Ca2+ regulation. Thus, we argue for the persistence and physiological relevance of an ancient Ca2+ regulatory module across Na and Ca2+ channels.

Original languageEnglish (US)
Pages (from-to)1657-1670
Number of pages14
JournalCell
Volume157
Issue number7
DOIs
StatePublished - Jun 19 2014

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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