Voltage regulation of connexin channel conductance.

Voltage regulation of connexin channel conductance.
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DOI:
10.3349/ymj.2015.56.1.1
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发表时间:
2015-01
影响因子:
2.4
通讯作者:
Bargiello TA
Bargiello TA
中科院分区:
医学4区
文献类型:
--
作者:
Oh S;Bargiello TA

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电压是调节由哺乳动物连接蛋白基因家族的21个成员形成的细胞间和质膜通道(未对接半通道)的电导的重要参数。连接蛋白通道具有两种电压依赖性:离子电流整流和电压依赖性门控。离子整流的结果,无论是从固定电荷的分布不对称,由于异型配对的不同hemichannels,或通过通道块,所产生的二价阳离子的浓度差异的交界斑块的相对两侧。这种整流可能是在某些电突触中观察到的电整流的基础。细胞间和未对接的半通道还显示两种不同形式的电压依赖性门控,称为Vj(快)门控和环(慢)门控。这篇综述总结了我们目前对这些构象变化的分子决定因素和机制的理解,这些构象变化来自实验,分子遗传学,结构和计算方法。
Voltage is an important parameter that regulates the conductance of both intercellular and plasma membrane channels (undocked hemichannels) formed by the 21 members of the mammalian connexin gene family. Connexin channels display two forms of voltage-dependence, rectification of ionic currents and voltage-dependent gating. Ionic rectification results either from asymmetries in the distribution of fixed charges due to heterotypic pairing of different hemichannels, or by channel block, arising from differences in the concentrations of divalent cations on opposite sides of the junctional plaque. This rectification likely underpins the electrical rectification observed in some electrical synapses. Both intercellular and undocked hemichannels also display two distinct forms of voltage-dependent gating, termed Vj (fast)-gating and loop (slow)-gating. This review summarizes our current understanding of the molecular determinants and mechanisms underlying these conformational changes derived from experimental, molecular-genetic, structural, and computational approaches.
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