Ion conduction through C-type inactivated Shaker channels.

Ion conduction through C-type inactivated Shaker channels.
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离子通过C型灭活振荡器通道传导。

DOI:
10.1085/jgp.110.5.539
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发表时间:
1997-11
影响因子:
3.8
通讯作者:
Heinemann, SH
Heinemann, SH
中科院分区:
医学2区
文献类型:
--
作者:
Starkus, JG;Kuschel, L;Rayner, MD;Heinemann, SH

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Shaker钾通道的C型失活涉及进入一种状态(或多种状态),其中失活的通道在生理溶液中表现为不导电。然而,当Shaker通道,从其中快速N-型失活已被删除的NH 2-末端缺失,在非洲爪蟾卵母细胞中表达,并在由内而外的补丁进行评估,从内部溶液中完全去除K+离子暴露的传导Na+和Li+在C-型失活的构象状态。本文利用这一观察结果,通过C型失活通道状态的离子传导的性质,并表明,激活和失活都可以发生在C型状态,虽然比正常的动力学慢。处于C型状态的通道表现为“未激活”(即,在生理溶液中,由于两种单独的作用的总和,C-型失活导致K+在生理溶液中不导电(不导电):首先,内部K+离子阻止Na+离子渗透通过通道;其次,相对于Na+的渗透性,C-型失活大大降低了K+的渗透性,从而改变了通道的离子选择性。
C-type inactivation of Shaker potassium channels involves entry into a state (or states) in which the inactivated channels appear nonconducting in physiological solutions. However, when Shaker channels, from which fast N-type inactivation has been removed by NH2-terminal deletions, are expressed in Xenopus oocytes and evaluated in inside-out patches, complete removal of K+ ions from the internal solution exposes conduction of Na+ and Li+ in C-type inactivated conformational states. The present paper uses this observation to investigate the properties of ion conduction through C-type inactivated channel states, and demonstrates that both activation and deactivation can occur in C-type states, although with slower than normal kinetics. Channels in the C-type states appear “inactivated” (i.e., nonconducting) in physiological solutions due to the summation of two separate effects: first, internal K+ ions prevent Na+ ions from permeating through the channel; second, C-type inactivation greatly reduces the permeability of K+ relative to the permeability of Na+, thus altering the ion selectivity of the channel.
DOI: 10.1085/jgp.109.5.527
发表时间: 1997-05-01
影响因子: 3.8
作者:
Holmgren, M;Smith, PL;Yellen, G
通讯作者: Yellen, G
DOI: 10.1016/s0006-3495(95)80114-1
发表时间: 1995-12-01
影响因子: 3.4
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振动钾通道门控。 II:激活途径中的过渡。
DOI: 10.1085/jgp.103.2.279
发表时间: 1994-02
期刊: The Journal of general physiology
影响因子: --
作者:
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DOI: 10.1016/s0896-6273(00)80106-3
发表时间: 1996-04-01
期刊: NEURON
影响因子: 16.2
作者:
Liu, Y;Jurman, ME;Yellen, G
通讯作者: Yellen, G