Voltage sensor gating charge transfer in a hERG potassium channel model.

Voltage sensor gating charge transfer in a hERG potassium channel model.
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DOI:
10.1016/j.bpj.2014.10.001
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发表时间:
2014-11-18
影响因子:
3.4
通讯作者:
Dempsey, Christopher E.
Dempsey, Christopher E.
中科院分区:
生物学3区
文献类型:
--
作者:
Colenso, Charlotte K.;Cao, Yang;Sessions, Richard B.;Hancox, Jules C.;Dempsey, Christopher E.

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在水合POPC双分子层的分子动力学模拟过程中,hERG K+通道模型的松弛伴随着精氨酸门控电荷在两个电压传感器域中跨越电荷转移中心的转变。对精氨酸侧链穿过电荷转移中心的检测表明,精氨酸胍阳离子独特的水合性质有助于在电压传感器响应膜电位变化时进行电荷转移,这也是在电压敏感离子通道中,精氨酸比赖氨酸更容易成为移动电荷载体的原因。
Relaxation of a hERG K+ channel model during molecular-dynamics simulation in a hydrated POPC bilayer was accompanied by transitions of an arginine gating charge across a charge transfer center in two voltage sensor domains. Inspection of the passage of arginine side chains across the charge transfer center suggests that the unique hydration properties of the arginine guanidine cation facilitates charge transfer during voltage sensor responses to changes in membrane potential, and underlies the preference of Arg over Lys as a mobile charge carrier in voltage-sensitive ion channels.
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