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
影响因子:
4.6
通讯作者:
Jones DK
中科院分区:
文献类型:
--
作者:
Jones DK
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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影响因子:
64.5
作者:
Cabral, JHM;Lee, A;Mackinnon, R
通讯作者:
Mackinnon, R
影响因子:
64.8
作者:
通讯作者:
--
DOI:
10.1073/pnas.0900180106
发表时间:
2009-08-04
影响因子:
11.1
作者:
Gustina, Ahleah S.;Trudeau, Matthew C.
通讯作者:
Trudeau, Matthew C.
影响因子:
4.8
作者:
Chen, J;Zou, AR;Sanguinetti, MC
通讯作者:
Sanguinetti, MC
DOI:
10.1085/jgp.201110722
发表时间:
2012-01
期刊:
The Journal of general physiology
影响因子:
--
作者:
Chowdhury S;Chanda B
通讯作者:
Chanda B