National Natural Science Foundation of China (NSFC)
31622021
中国
National Natural Science Foundation of China (NSFC)
91857000
中国
National Natural Science Foundation of China (NSFC)
31821091
中国
National Natural Science Foundation of China (NSFC)
31870833
中国
引用
ジャーナル: Nat Commun / 年: 2020 タイトル: Structure of voltage-modulated sodium-selective NALCN-FAM155A channel complex. 著者: Yunlu Kang / Jing-Xiang Wu / Lei Chen / 要旨: Resting membrane potential determines the excitability of the cell and is essential for the cellular electrical activities. The NALCN channel mediates sodium leak currents, which positively adjust ...Resting membrane potential determines the excitability of the cell and is essential for the cellular electrical activities. The NALCN channel mediates sodium leak currents, which positively adjust resting membrane potential towards depolarization. The NALCN channel is involved in several neurological processes and has been implicated in a spectrum of neurodevelopmental diseases. Here, we report the cryo-EM structure of rat NALCN and mouse FAM155A complex to 2.7 Å resolution. The structure reveals detailed interactions between NALCN and the extracellular cysteine-rich domain of FAM155A. We find that the non-canonical architecture of NALCN selectivity filter dictates its sodium selectivity and calcium block, and that the asymmetric arrangement of two functional voltage sensors confers the modulation by membrane potential. Moreover, mutations associated with human diseases map to the domain-domain interfaces or the pore domain of NALCN, intuitively suggesting their pathological mechanisms.
Sodiumleakchannelnon-selectiveprotein / Four domain-type voltage-gated ion channel alpha-1 subunit / Rb21-channel / Voltage gated channel- ...Four domain-type voltage-gated ion channel alpha-1 subunit / Rb21-channel / Voltage gated channel-like protein 1