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Current view on regulation of voltage-gated sodium channels by calcium and auxiliary proteins.

TitleCurrent view on regulation of voltage-gated sodium channels by calcium and auxiliary proteins.
Publication TypeJournal Article
Year of Publication2016
AuthorsPitt GS, Lee S-Y
JournalProtein Sci
Volume25
Issue9
Pagination1573-84
Date Published2016 Sep
ISSN1469-896X
Abstract

In cardiac and skeletal myocytes, and in most neurons, the opening of voltage-gated Na(+) channels (NaV channels) triggers action potentials, a process that is regulated via the interactions of the channels' intercellular C-termini with auxiliary proteins and/or Ca(2+) . The molecular and structural details for how Ca(2+) and/or auxiliary proteins modulate NaV channel function, however, have eluded a concise mechanistic explanation and details have been shrouded for the last decade behind controversy about whether Ca(2+) acts directly upon the NaV channel or through interacting proteins, such as the Ca(2+) binding protein calmodulin (CaM). Here, we review recent advances in defining the structure of NaV intracellular C-termini and associated proteins such as CaM or fibroblast growth factor homologous factors (FHFs) to reveal new insights into how Ca(2+) affects NaV function, and how altered Ca(2+) -dependent or FHF-mediated regulation of NaV channels is perturbed in various disease states through mutations that disrupt CaM or FHF interaction.

DOI10.1002/pro.2960
Alternate JournalProtein Sci.
PubMed ID27262167
PubMed Central IDPMC5338247
Grant ListDP2 OD008380 / OD / NIH HHS / United States
R01 HL122967 / HL / NHLBI NIH HHS / United States