The Sixth Transmembrane Segment Is a Major Gating Component of the TMEM16A Calcium-Activated Chloride Channel.

The Sixth Transmembrane Segment Is a Major Gating Component of the TMEM16A Calcium-Activated Chloride Channel.
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DOI:
10.1016/j.neuron.2018.01.048
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发表时间:
2018-03-07
期刊:
影响因子:
16.2
通讯作者:
Jan LY
Jan LY
中科院分区:
医学1区
文献类型:
--
作者:
Peters CJ;Gilchrist JM;Tien J;Bethel NP;Qi L;Chen T;Wang L;Jan YN;Grabe M;Jan LY

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由TMEM 16 A或TMEM 16 B形成的钙激活氯离子通道(CaCC)在神经系统、平滑肌、外分泌腺和其它组织中广泛表达。二聚体CaCC在每个单体内具有两个钙结合位点和一个孔,表现出电压依赖性钙敏感性。通道活性还取决于渗透阴离子的身份。为了了解CaCC如何调节神经元信号传导以及CaCC如何反过来受到神经元活动的调节,我们研究了CaCC门控的分子基础。在这里,我们报告TMEM 16 A-CaCC的电压调节涉及膜电场内钙离子和阴离子结合位点的电压依赖性占据以及通道蛋白固有的电压依赖性构象变化。这些门控方式都严重依赖于第六跨膜段。TMEM 16 A是一种在多种细胞类型中具有功能的离子通道蛋白。Peters等人确定了一个特定的结构域,它整合了该通道对三种可分离的生理刺激的反应。
Calcium-activated chloride channels (CaCC) formed by TMEM16A or TMEM16B are broadly expressed in the nervous system, smooth muscles, exocrine glands, and other tissues. With two calcium-binding sites and a pore within each monomer, the dimeric CaCC exhibits voltage dependent calcium sensitivity. Channel activity also depends on the identity of permeant anions. To understand how CaCC regulates neuronal signaling and how CaCC is, in turn, modulated by neuronal activity, we examined the molecular basis of CaCC gating. Here we report voltage modulation of TMEM16A-CaCC involves voltage-dependent occupancy of calcium and anion binding site(s) within the membrane electric field as well as a voltage-dependent conformational change intrinsic to the channel protein. These gating modalities all critically depend on the sixth transmembrane segment. TMEM16A is an ion channel protein with functions in a multitude of cell types. Peters et al. identified a specific domain that integrates the responses of this channel to three separable physiological stimuli.
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