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Crystal structure of the epithelial calcium channel TRPV6

Author

Listed:
  • Kei Saotome

    (Columbia University)

  • Appu K. Singh

    (Columbia University)

  • Maria V. Yelshanskaya

    (Columbia University)

  • Alexander I. Sobolevsky

    (Columbia University)

Abstract

Precise regulation of calcium homeostasis is essential for many physiological functions. The Ca2+-selective transient receptor potential (TRP) channels TRPV5 and TRPV6 play vital roles in calcium homeostasis as Ca2+ uptake channels in epithelial tissues. Detailed structural bases for their assembly and Ca2+ permeation remain obscure. Here we report the crystal structure of rat TRPV6 at 3.25 Å resolution. The overall architecture of TRPV6 reveals shared and unique features compared with other TRP channels. Intracellular domains engage in extensive interactions to form an intracellular ‘skirt’ involved in allosteric modulation. In the K+ channel-like transmembrane domain, Ca2+ selectivity is determined by direct coordination of Ca2+ by a ring of aspartate side chains in the selectivity filter. On the basis of crystallographically identified cation-binding sites at the pore axis and extracellular vestibule, we propose a Ca2+ permeation mechanism. Our results provide a structural foundation for understanding the regulation of epithelial Ca2+ uptake and its role in pathophysiology.

Suggested Citation

  • Kei Saotome & Appu K. Singh & Maria V. Yelshanskaya & Alexander I. Sobolevsky, 2016. "Crystal structure of the epithelial calcium channel TRPV6," Nature, Nature, vol. 534(7608), pages 506-511, June.
    • Handle: RePEc:nat:nature:v:534:y:2016:i:7608:d:10.1038_nature17975
    DOI: 10.1038/nature17975
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    Cited by:

    1. Arthur Neuberger & Kirill D. Nadezhdin & Alexander I. Sobolevsky, 2021. "Structural mechanisms of TRPV6 inhibition by ruthenium red and econazole," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    2. Arthur Neuberger & Yury A. Trofimov & Maria V. Yelshanskaya & Jeffrey Khau & Kirill D. Nadezhdin & Lena S. Khosrof & Nikolay A. Krylov & Roman G. Efremov & Alexander I. Sobolevsky, 2023. "Molecular pathway and structural mechanism of human oncochannel TRPV6 inhibition by the phytocannabinoid tetrahydrocannabivarin," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    3. Arthur Neuberger & Yury A. Trofimov & Maria V. Yelshanskaya & Kirill D. Nadezhdin & Nikolay A. Krylov & Roman G. Efremov & Alexander I. Sobolevsky, 2023. "Structural mechanism of human oncochannel TRPV6 inhibition by the natural phytoestrogen genistein," Nature Communications, Nature, vol. 14(1), pages 1-13, December.

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