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Structures and gating mechanisms of human bestrophin anion channels

Author

Listed:
  • Aaron P. Owji

    (Columbia University
    Columbia University)

  • Jiali Wang

    (Columbia University)

  • Alec Kittredge

    (Columbia University
    Columbia University)

  • Zada Clark

    (Columbia University)

  • Yu Zhang

    (Columbia University)

  • Wayne A. Hendrickson

    (Columbia University
    Columbia University
    New York Structural Biology Center)

  • Tingting Yang

    (Columbia University)

Abstract

Bestrophin-1 (Best1) and bestrophin-2 (Best2) are two members of the bestrophin family of calcium (Ca2+)-activated chloride (Cl−) channels with critical involvement in ocular physiology and direct pathological relevance. Here, we report cryo-EM structures of wild-type human Best1 and Best2 in various states at up to 1.8 Å resolution. Ca2+-bound Best1 structures illustrate partially open conformations at the two Ca2+-dependent gates of the channels, in contrast to the fully open conformations observed in Ca2+-bound Best2, which is in accord with the significantly smaller currents conducted by Best1 in electrophysiological recordings. Comparison of the closed and open states reveals a C-terminal auto-inhibitory segment (AS), which constricts the channel concentrically by wrapping around the channel periphery in an inter-protomer manner and must be released to allow channel opening. Our results demonstrate that removing the AS from Best1 and Best2 results in truncation mutants with similar activities, while swapping the AS between Best1 and Best2 results in chimeric mutants with swapped activities, underlying a key role of the AS in determining paralog specificity among bestrophins.

Suggested Citation

  • Aaron P. Owji & Jiali Wang & Alec Kittredge & Zada Clark & Yu Zhang & Wayne A. Hendrickson & Tingting Yang, 2022. "Structures and gating mechanisms of human bestrophin anion channels," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31437-7
    DOI: 10.1038/s41467-022-31437-7
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    References listed on IDEAS

    as
    1. Yu Zhang & Alec Kittredge & Nancy Ward & Changyi Ji & Shoudeng Chen & Tingting Yang, 2018. "ATP activates bestrophin ion channels through direct interaction," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    2. Veronica Kane Dickson & Leanne Pedi & Stephen B. Long, 2014. "Structure and insights into the function of a Ca2+-activated Cl− channel," Nature, Nature, vol. 516(7530), pages 213-218, December.
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    Cited by:

    1. Jiali Wang & Aaron P. Owji & Alec Kittredge & Zada Clark & Yu Zhang & Tingting Yang, 2024. "GAD65 tunes the functions of Best1 as a GABA receptor and a neurotransmitter conducting channel," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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