Pore-forming segments in voltage-gated chloride channels

Christoph Fahlke, Henry T. Yu, Carol L. Beck, Thomas H. Rhodes and Alfred L. George ()
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Christoph Fahlke: Vanderbilt University School of Medicine
Henry T. Yu: Vanderbilt University School of Medicine
Carol L. Beck: Vanderbilt University School of Medicine
Thomas H. Rhodes: Vanderbilt University School of Medicine
Alfred L. George: Vanderbilt University School of Medicine

Nature, 1997, vol. 390, issue 6659, 529-532

Abstract: Abstract 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.

Date: 1997
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DOI: 10.1038/37391

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