Conservation of Ca2+/calmodulin regulation across Na and Ca2+ channels.

Conservation of Ca2+/calmodulin regulation across Na and Ca2+ channels.
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DOI:
10.1016/j.cell.2014.04.035
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发表时间:
2014-06-19
期刊:
影响因子:
64.5
通讯作者:
Yue DT
Yue DT
中科院分区:
生物学1区
文献类型:
--
作者:
Ben-Johny M;Yang PS;Niu J;Yang W;Joshi-Mukherjee R;Yue DT

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电压门控 Na 和 Ca2+ 通道包含不同的离子通道超家族,但这些通道的羧基尾部表现出高度同源性,暗示存在长期共享且有目的的模块。对于不同的 Ca2+ 通道,羧基尾部与钙调蛋白的相互作用确实阐述了强大且相似的 Ca2+ 调节形式。然而,Na 通道仅表现出更微妙的 Ca2+ 调节,这种调节在不同的报告中有所不同,这对统一理解的尝试提出了挑战。在这里,通过对 Na 通道的快速 Ca2+ 光释放,我们重置了 Na 通道调节的观点。对于心肌通道 (NaV1.5),大多数机制建议都源自报告的影响,我们没有观察到 Ca2+ 调节。相反,对于骨骼肌通道 (NaV1.4),我们发现快速 Ca2+ 调节与 Ca2+ 通道的调节惊人地相似。通道不病性肌强直突变使 NaV1.4 Ca2+ 调节减半,将 NaV1.4 羧基尾移植到 Ca2+ 通道上可重现 Ca2+ 调节。因此,我们主张古老的 Ca2+ 调节模块跨 Na 和 Ca2+ 通道的持久性和生理相关性。
Voltage-gated Na and Ca2+channels comprise distinct ion-channel superfamilies, yet the carboxy tails of these channels exhibit high homology hinting at a long-shared and purposeful module. For different Ca2+ channels, carboxyl-tail inter actions with calmodulin do elaborate robust and similar forms of Ca2+ regulation. However, Na channels have only shown subtler Ca2+modulation that differs among reports, challenging attempts at unified understanding. Here, by rapid Ca2+photoreleaseon to Na channels, we reset this view of Na channel regulation. For cardiac muscle channels (NaV1.5), reported effects from which most mechanistic proposals derive, we observe no Ca2+modulation. Conversely, for skeletal-muscle channels (NaV1.4), we uncover fast Ca2+ regulation eerily similar to that of Ca2+ channels. Channel opathic myotonia mutations halve NaV1.4 Ca2+ regulation, and transplanting the NaV1.4 carboxy tail onto Ca2+ channels recapitulates Ca2+ regulation. Thus we argue for the persistence and physiological relevance of an ancient Ca2+ regulatory module across Na and Ca2+ channels.
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