Molecular movement of the voltage sensor in a K channel.
Molecular movement of the voltage sensor in a K channel.
复制标题
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:
影响因子:
--
通讯作者:
Elinder F
中科院分区:
文献类型:
--
作者:
Broomand A;Männikkö R;Larsson HP;Elinder F
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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