Molecular bases of multimodal regulation of a fungal transient receptor potential (TRP) channel

Makoto Ihara, Shin Hamamoto, Yohei Miyanoiri, Mitsuhiro Takeda, Masatsune Kainosho, Isamu Yabe, Nobuyuki Uozumi, Atsuko Yamashita

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Multimodal activation by various stimuli is a fundamental characteristic of TRP channels. We identified a fungal TRP channel, TRPGz, exhibiting activation by hyperosmolarity, temperature increase, cytosolic Ca2+ elevation, membrane potential, and H2O2 application, and thus it is expected to represent a prototypic multimodal TRP channel. TRPGz possesses a cytosolic C-terminal domain (CTD), primarily composed of intrinsically disordered regions with some regulatory modules, a putative coiled-coil region and a basic residue cluster. The CTD oligomerization mediated by the coiled-coil region is required for the hyperosmotic and temperature increase activations but not for the tetrameric channel formation or other activation modalities. In contrast, the basic cluster is responsible for general channel inhibition, by binding to phosphatidylinositol phosphates. The crystal structure of the presumed coiled-coil region revealed a tetrameric assembly in an offset spiral rather than a canonical coiled-coil. This structure underlies the observed moderate oligomerization affinity enabling the dynamic assembly and disassembly of the CTD during channel functions, which are compatible with the multimodal regulation mediated by each functional module.

Original languageEnglish
Pages (from-to)15303-15317
Number of pages15
JournalJournal of Biological Chemistry
Volume288
Issue number21
DOIs
Publication statusPublished - May 24 2013

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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