SWELL1, a plasma membrane protein, is an essential component of volume-regulated anion channel.

SWELL1, a plasma membrane protein, is an essential component of volume-regulated anion channel.
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Swell1是一种质膜蛋白,是体积调节阴离子通道的重要组成部分。

DOI:
10.1016/j.cell.2014.03.024
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发表时间:
2014-04-10
期刊:
影响因子:
64.5
通讯作者:
Patapoutian A
Patapoutian A
中科院分区:
生物学1区
文献类型:
--
作者:
Qiu Z;Dubin AE;Mathur J;Tu B;Reddy K;Miraglia LJ;Reinhardt J;Orth AP;Patapoutian A

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维持恒定的细胞体积以响应细胞外或细胞内的渗透变化对于细胞内稳态是至关重要的。普遍存在的体积调节阴离子通道(VRAC)的激活在这一过程中起着关键作用,然而,其在脊椎动物中的分子身份仍然未知。在这里,我们使用了基于细胞的荧光分析,并进行了全基因组RNAi筛选,以找到VRAC的组成部分。我们确定SWELL1(LRRC8A),一个功能未知的四跨膜蛋白家族的成员,为低渗诱导的碘离子内流所必需。SWELL1定位于质膜,其敲低显著降低了各种细胞类型中的内源性VRAC电流和调节性细胞体积减小。此外,SWELL1中的点突变导致VRAC阴离子选择性的显著变化,表明SWELL1是VRAC的重要组分。这些发现使VRAC通道复合物的进一步分子表征和遗传研究能够理解VRAC在正常生理和疾病中的功能。
Maintenance of a constant cell volume in response to extracellular or intracellular osmotic changes is critical for cellular homeostasis. Activation of a ubiquitous volume-regulated anion channel (VRAC) plays a key role in this process; however, its molecular identity in vertebrates remains unknown. Here, we used a cell-based fluorescence assay and performed a genome-wide RNAi screen to find components of VRAC. We identified SWELL1 (LRRC8A), a member of a four-transmembrane protein family with unknown function, as essential for hypotonicity-induced iodide influx. SWELL1 is localized to the plasma membrane, and its knockdown dramatically reduces endogenous VRAC currents and regulatory cell volume decrease in various cell types. Furthermore, point mutations in SWELL1 cause a significant change in VRAC anion selectivity, demonstrating that SWELL1 is an essential VRAC component. These findings enable further molecular characterization of the VRAC channel complex and genetic studies for understanding the function of VRAC in normal physiology and disease.
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