Hysteretic hERG channel gating current recorded at physiological temperature.

Hysteretic hERG channel gating current recorded at physiological temperature.
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DOI:
10.1038/s41598-022-10003-7
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发表时间:
2022-04-08
期刊:
影响因子:
4.6
通讯作者:
Jones DK
Jones DK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jones DK

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心脏hERG通道包括至少两个亚基hERG 1a和hERG 1b,并驱动心脏动作电位复极。hERG 1a亚基含有hERG 1b中不存在的胞质PAS结构域。hERG 1a PAS结构域调节电压传感器结构域(VSD)的运动,但尚未在生理温度下研究hERG VSD行为及其受hERG 1a PAS结构域的调节。我们在接近生理温度(36 ± 1 °C)下记录了同源hERG 1a和异源hERG 1a/1b通道的门控电荷,使用的脉冲持续时间与人心室动作电位的长度相当。失活的电压依赖性是超极化相对于激活,反映VSD松弛在正电位。这些数据表明,弛豫(滞后)的作品,以延迟在复极化孔关闭。有趣的是,hERG 1a VSD失活显示双Boltzmann分布,但hERG 1a/1b失活显示单Boltzmann分布。使用PAS靶向抗体禁用hERG 1a PAS结构域类似地将hERG 1a失活从双Boltzmann转变为单Boltzmann,突出了PAS在调节VSD运动中的贡献。据我们所知,这些数据代表了在生理温度下hERG门控电荷的首次记录,并证明在生理温度下hERG通道中存在VSD松弛(滞后)。
Cardiac hERG channels comprise at least two subunits, hERG 1a and hERG 1b, and drive cardiac action potential repolarization. hERG 1a subunits contain a cytoplasmic PAS domain that is absent in hERG 1b. The hERG 1a PAS domain regulates voltage sensor domain (VSD) movement, but hERG VSD behavior and its regulation by the hERG 1a PAS domain have not been studied at physiological temperatures. We recorded gating charge from homomeric hERG 1a and heteromeric hERG 1a/1b channels at near physiological temperatures (36 ± 1 °C) using pulse durations comparable in length to the human ventricular action potential. The voltage dependence of deactivation was hyperpolarized relative to activation, reflecting VSD relaxation at positive potentials. These data suggest that relaxation (hysteresis) works to delay pore closure during repolarization. Interestingly, hERG 1a VSD deactivation displayed a double Boltzmann distribution, but hERG 1a/1b deactivation displayed a single Boltzmann. Disabling the hERG 1a PAS domain using a PAS-targeting antibody similarly transformed hERG 1a deactivation from a double to a single Boltzmann, highlighting the contribution of the PAS in regulating VSD movement. These data represent, to our knowledge, the first recordings of hERG gating charge at physiological temperature and demonstrate that VSD relaxation (hysteresis) is present in hERG channels at physiological temperature.
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