Insight into the function of a unique voltage-sensor protein (TMEM266) and its short form in mouse cerebellum

Takafumi Kawai, Hirotaka Narita, Kohtarou Konno, Sharmin Akter, Rizki Tsari Andriani, Hirohide Iwasaki, Shoji Nishikawa, Norihiko Yokoi, Yuko Fukata, Masaki Fukata, Pattama Wiriyasermkul, Pornparn Kongpracha, Shushi Nagamori, Keizo Takao, Tsuyoshi Miyakawa, Manabu Abe, Kenji Sakimura, Masahiko Watanabe, Atsushi Nakagawa, Yasushi Okamura

Research output: Contribution to journalArticlepeer-review

Abstract

Voltage-sensing proteins generally consist of voltage-sensor domains and pore-gate domains, forming the voltage-gated ion channels. However, there are several unconventional voltage-sensor proteins that lack pore-gate domains, conferring them unique voltage-sensing machinery. TMEM266, which is expressed in cerebellum granule cells, is one of the interesting voltage-sensing proteins that has a putative intracellular coiled-coil and a functionally unidentified cytosolic region instead of a pore-gate domain. Here, we approached the molecular function of TMEM266 by performing co-immunoprecipitation experiments. We unexpectedly discovered that TMEM266 proteins natively interact with the novel short form splice variants that only have voltage-sensor domains and putative cytosolic coiled-coil region in cerebellum. The crystal structure of coiled-coil region of TMEM266 suggested that these coiled-coil regions play significant roles in forming homodimers. In vitro expression experiments supported the idea that short form TMEM266 (sTMEM266) or full length TMEM266 (fTMEM266) form homodimers. We also performed proximity labeling mass spectrometry analysis for fTMEM266 and sTMEM266 using Neuro-2A, neuroblastoma cells, and fTMEM266 showed more interacting molecules than sTMEM266, suggesting that the C-terminal cytosolic region in fTMEM266 binds to various targets. Finally, TMEM266-deficient animals showed the moderate abnormality in open-field test. The present study provides clues about the novel voltage-sensing mechanism mediated by TMEM266.

Original languageEnglish
Pages (from-to)1127-1145
Number of pages19
JournalBiochemical Journal
Volume479
Issue number11
DOIs
Publication statusPublished - 06-2022

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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