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  • Title: Mechanism of calmodulin inactivation of the calcium-selective TRP channel TRPV6.
    Author: Singh AK, McGoldrick LL, Twomey EC, Sobolevsky AI.
    Journal: Sci Adv; 2018 Aug; 4(8):eaau6088. PubMed ID: 30116787.
    Abstract:
    Calcium (Ca2+) plays a major role in numerous physiological processes. Ca2+ homeostasis is tightly controlled by ion channels, the aberrant regulation of which results in various diseases including cancers. Calmodulin (CaM)-mediated Ca2+-induced inactivation is an ion channel regulatory mechanism that protects cells against the toxic effects of Ca2+ overload. We used cryo-electron microscopy to capture the epithelial calcium channel TRPV6 (transient receptor potential vanilloid subfamily member 6) inactivated by CaM. The TRPV6-CaM complex exhibits 1:1 stoichiometry; one TRPV6 tetramer binds both CaM lobes, which adopt a distinct head-to-tail arrangement. The CaM carboxyl-terminal lobe plugs the channel through a unique cation-π interaction by inserting the side chain of lysine K115 into a tetra-tryptophan cage at the pore's intracellular entrance. We propose a mechanism of CaM-mediated Ca2+-induced inactivation that can be explored for therapeutic design.
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