Pore-forming segments in voltage-gated chloride channels

被引:0
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作者
Christoph Fahlke
Henry T. Yu
Carol L. Beck
Thomas H. Rhodes
Alfred L. George
机构
[1] Vanderbilt University School of Medicine,Departments of Medicine (Nephrology) and Pharmacology, and the Center for Molecular Neuroscience
来源
Nature | 1997年 / 390卷
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摘要
The ability to differentiate between ions is a property of ion channels that is crucial for their biological functions1. However, the fundamental structural features that define anion selectivity and distinguish anion-permeable from cation-permeable channels are poorly understood. Voltage-gated chloride (Cl−) channels belonging to the ClC family are ubiquitous and have been predicted to play important roles in many diverse physiological2 and pathophysiological3,4,5 processes. We have identified regions of a human skeletal muscle ClC isoform that contribute to formation of its anion-selective conduction pathway. A core structural element (P1 region) of the ClC channel pore spans an accessibility barrier between the internal and external milieu, and contains an evolutionarily conserved sequence motif: GKxGPxxH. Neighbouring sequences in the third and fifth transmembrane segments also contribute to isoform-specific differences in anion selectivity. The conserved motif in the Cl−channel P1 region may constitute a ‘signature’ sequence for an anion-selective ion pore by analogy with the homologous GYG sequence that is essential for selectivity in voltage-gated potassium ion (K+) channel pores6,7,8.
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页码:529 / 532
页数:3
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