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Crystal structure of the epithelial calcium channel TRPV6

机译:上皮钙通道TRPV6的晶体结构

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摘要

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 angstrom 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.
机译:钙稳态的精确调节对于许多生理功能至关重要。 Ca2 +选择性瞬时受体电位(TRP)通道TRPV5和TRPV6在钙稳态中起着至关重要的作用,因为上皮组织中的Ca2 +摄取通道。有关其组装和Ca2 +渗透的详细结构基础仍然不清楚。在这里,我们报告大鼠TRPV6在3.25埃分辨率的晶体结构。与其他TRP通道相比,TRPV6的总体体系结构具有共享和独特的功能。细胞内结构域参与广泛的相互作用以形成参与变构调节的细胞内“裙”。在K +通道样跨膜结构域中,Ca2 +选择性是通过选择性过滤器中的天门冬氨酸侧链环直接协调Ca2 +来确定的。基于在晶体学上确定的在孔轴和细胞外前庭的阳离子结合位点,我们提出了Ca2 +渗透机制。我们的结果为理解上皮钙离子摄取的调控及其在病理生理中的作用提供了结构基础。

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  • 来源
    《Nature》 |2016年第7608期|506-511|共6页
  • 作者单位

    Columbia Univ, Dept Biochem & Mol Biophys, 680 West 168th St, New York, NY 10032 USA;

    Columbia Univ, Dept Biochem & Mol Biophys, 680 West 168th St, New York, NY 10032 USA;

    Columbia Univ, Dept Biochem & Mol Biophys, 680 West 168th St, New York, NY 10032 USA;

    Columbia Univ, Dept Biochem & Mol Biophys, 680 West 168th St, New York, NY 10032 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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