Molecular movement of the voltage sensor in a K channel.

Molecular movement of the voltage sensor in a K channel.
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电压传感器在K通道中的分子运动。

DOI:
10.1085/jgp.200308927
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发表时间:
2003-12
期刊:
The Journal of general physiology
影响因子:
--
通讯作者:
Elinder F
Elinder F
中科院分区:
其他
文献类型:
--
作者:
Broomand A;Männikkö R;Larsson HP;Elinder F

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最近发表了电压门控细菌K通道KvAP的X射线晶体结构。然而,电压传感器S4的位置和分子运动仍然存在争议。例如,在晶体结构中,S4位于远离孔域(>30 μ m)的位置,而静电实验表明,S4位于靠近(<8 μ m)开放通道中的孔域。为了测试所提出的S4相对于孔结构域的位置和运动,我们在引入的半胱氨酸对之间诱导二硫键:一个在S4中,一个在孔结构域中。S4中的几个残基与孔域中的残基形成了状态依赖性二硫键。我们的数据表明,S4位于邻近亚基中的孔域附近。我们的数据还限制了S4运动的可能模型,并且与最近提出的KvAP模型不兼容。
The X-ray crystallographic structure of KvAP, a voltage-gated bacterial K channel, was recently published. However, the position and the molecular movement of the voltage sensor, S4, are still controversial. For example, in the crystallographic structure, S4 is located far away (>30 Å) from the pore domain, whereas electrostatic experiments have suggested that S4 is located close (<8 Å) to the pore domain in open channels. To test the proposed location and motion of S4 relative to the pore domain, we induced disulphide bonds between pairs of introduced cysteines: one in S4 and one in the pore domain. Several residues in S4 formed a state-dependent disulphide bond with a residue in the pore domain. Our data suggest that S4 is located close to the pore domain in a neighboring subunit. Our data also place constraints on possible models for S4 movement and are not compatible with a recently proposed KvAP model.
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发表时间: 1996-06-01
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