An LQT2-related mutation in the voltage-sensing domain is involved in switching the gating polarity of hERG
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Published:2024-02-05
Issue:1
Volume:22
Page:
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ISSN:1741-7007
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Container-title:BMC Biology
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language:en
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Short-container-title:BMC Biol
Author:
Liu Zhipei, Wang Feng, Yuan Hui, Tian Fuyun, Yang Chuanyan, Hu Fei, Liu Yiyao, Tang Meiqin, Ping Meixuan, Kang Chunlan, Luo Ting, Yang Guimei, Hu Mei, Gao Zhaobing, Li PingORCID
Abstract
Abstract
Background
Cyclic Nucleotide-Binding Domain (CNBD)-family channels display distinct voltage-sensing properties despite sharing sequence and structural similarity. For example, the human Ether-a-go-go Related Gene (hERG) channel and the Hyperpolarization-activated Cyclic Nucleotide-gated (HCN) channel share high amino acid sequence similarity and identical domain structures. hERG conducts outward current and is activated by positive membrane potentials (depolarization), whereas HCN conducts inward current and is activated by negative membrane potentials (hyperpolarization). The structural basis for the “opposite” voltage-sensing properties of hERG and HCN remains unknown.
Results
We found the voltage-sensing domain (VSD) involves in modulating the gating polarity of hERG. We identified that a long-QT syndrome type 2-related mutation within the VSD, K525N, mediated an inwardly rectifying non-deactivating current, perturbing the channel closure, but sparing the open state and inactivated state. K525N rescued the current of a non-functional mutation in the pore helix region (F627Y) of hERG. K525N&F627Y switched hERG into a hyperpolarization-activated channel. The reactivated inward current induced by hyperpolarization mediated by K525N&F627Y can be inhibited by E-4031 and dofetilide quite well. Moreover, we report an extracellular interaction between the S1 helix and the S5-P region is crucial for modulating the gating polarity. The alanine substitution of several residues in this region (F431A, C566A, I607A, and Y611A) impaired the inward current of K525N&F627Y.
Conclusions
Our data provide evidence that a potential cooperation mechanism in the extracellular vestibule of the VSD and the PD would determine the gating polarity in hERG.
Funder
National Natural Science Foundation of China Natural Science Foundation of Guangdong Province Zhongshan Science and Technology Bureau Postdoctoral Research Foundation of China Guangzhou Science and Technology Innovation Center Guangdong Science and Technology Department
Publisher
Springer Science and Business Media LLC
Subject
Cell Biology,Developmental Biology,Plant Science,General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,Physiology,Ecology, Evolution, Behavior and Systematics,Structural Biology,Biotechnology
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