Molecular determinants of differential pore blocking of kidney CLC-K chloride channels.

Abstract:

:The highly homologous Cl(-) channels CLC-Ka and CLC-Kb are important for water and salt conservation in the kidney and for the production of endolymph in the inner ear. Mutations in CLC-Kb lead to Bartter's syndrome and mutations in the small CLC-K subunit barttin lead to Bartter's syndrome and deafness. Here we show that CLC-Ka is blocked by the recently identified blocker 2-(p-chlorophenoxy)-3-phenylpropionic acid of the rat channel CLC-K1 with an apparent K(D) approximately 80 microM. We also found that DIDS (4,4'-diisothiocyanatostilbene-2,2'-disulphonic acid), a generic Cl(-) channel blocker, inhibits CLC-Ka (K(D) approximately 90 microM). Surprisingly, the highly homologous channel CLC-Kb is fivefold to sixfold less sensitive to both compounds. Guided by the crystal structure of bacterial CLC proteins, we identify two amino acids, N68/D68 and G72/E72, in CLC-Ka and CLC-Kb, respectively, that are responsible for the differential drug sensitivity. Both residues expose their side chains in the extracellular pore mouth, delineating the probable drug binding site. These novel CLC-K channel blockers are promising lead compounds for the development of new diuretic drugs.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Picollo A,Liantonio A,Didonna MP,Elia L,Camerino DC,Pusch M

doi

10.1038/sj.embor.7400169

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

584-9

issue

6

eissn

1469-221X

issn

1469-3178

pii

7400169

journal_volume

5

pub_type

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