A molecular mechanism for proton-dependent gating in KcsA.

A molecular mechanism for proton-dependent gating in KcsA.
复制标题

DOI:
10.1016/j.febslet.2010.02.003
复制
发表时间:
2010-03-19
期刊:
影响因子:
3.5
通讯作者:
Perozo E
Perozo E
中科院分区:
生物学3区
文献类型:
--
作者:
Cuello LG;Cortes DM;Jogini V;Sompornpisut A;Perozo E

文献摘要

参考文献

被引文献

相似文献

KcsA的激活门控由细胞内质子浓度的变化引起。Thompson等人确定了内门周围的电荷簇,该电荷簇在定义KcsA中的质子活化中起着关键作用。在这里,通过功能和光谱方法,我们证实了这个电荷簇的作用,现在提供了一个pH依赖性门控的机制。沟道开放由一组静电相互作用驱动,包括TM 2底部的R117、E120和E118以及TM 1末端的H25。我们建议,在这个电荷簇的静电补偿稳定的封闭构象在中性pH值和它的破坏在低pH值有利于通过螺旋-螺旋排斥的开放构象的过渡。
Activation gating in KcsA is elicited by changes in intracellular proton concentration. Thompson et al identified a charge cluster around the inner gate that plays a key role in defining proton activation in KcsA. Here, through functional and spectroscopic approaches, we confirmed the role of this charge cluster and now provide a mechanism of pH-dependent gating. Channel opening is driven by a set of electrostatic interactions that include R117, E120 and E118 at the bottom of TM2 and H25 at the end of TM1. We propose that electrostatic compensation in this charge cluster stabilizes the closed conformation at neutral pH and that its disruption at low pH facilitates the transition to the open conformation by means of helix-helix repulsion.
全长KCSA的分子结构:细胞质结构域在离子渗透和激活门口中的作用。
DOI: 10.1085/jgp.117.2.165
发表时间: 2001-02
影响因子: 3.8
作者:
Cortes, DM;Cuello, LG;Perozo, E
通讯作者: Perozo, E
DOI: 10.1152/ajpcell.1998.275.4.c1113
发表时间: 1998-10-01
影响因子: 5.5
作者:
Stroffekova, K;Kupert, EY;Cuppoletti, J
通讯作者: Cuppoletti, J
DOI: 10.1074/jbc.m608264200
发表时间: 2007-05-18
影响因子: 4.8
作者:
Takeuchi, Koh;Takahashi, Hideo;Shimada, Ichio
通讯作者: Shimada, Ichio
DOI: 10.1016/s0022-2836(83)80079-5
发表时间: 1983-01-01
影响因子: 5.6
作者:
BARLOW, DJ;THORNTON, JM
通讯作者: THORNTON, JM
DOI: 10.1021/bi971018y
发表时间: 1997-08-19
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Cortes, DM;Perozo, E
通讯作者: Perozo, E