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Conservation of chloride channel structure revealed by an inhibitor binding site in ClC-1

Item Type:Article
Title:Conservation of chloride channel structure revealed by an inhibitor binding site in ClC-1
Creators Name:Estevez, R., Schroeder, B.C., Accardi, A., Jentsch, T.J. and Pusch, M.
Abstract:Crystal structures of bacterial CLC proteins were solved recently, but it is unclear to which level of detail they can be extrapolated to mammalian chloride channels. Exploiting the difference in inhibition by 9-anthracene carboxylic acid (9-AC) between ClC-0, -1, and -2, we identified a serine between helices O and P as crucial for 9-AC binding. Mutagenesis based on the crystal structure identified further residues affecting inhibitor binding. They surround a partially hydrophobic pocket close to the chloride binding site that is accessible from the cytoplasm, consistent with the observed intracellular block by 9-AC. Mutations in presumably Cl--coordinating residues yield additional insights into the structure and function of ClC-1. Our work shows that the structure of bacterial CLCs can be extrapolated with fidelity to mammalian Cl- channels.
Keywords:Anthracenes, Binding Sites, Chloride Channels, Conserved Sequence, Ion Channel Gating, Molecular Sequence Data, Site-Directed Mutagenesis, Oocytes, Patch-Clamp Techniques, Tertiary Protein Structure, Recombinant Fusion Proteins, Amino Acid Sequence Homology, Serine, Animals, Xenopus, Rats
Publisher:Cell Press
Page Range:47-59
Date:10 April 2003
Official Publication:https://doi.org/10.1016/S0896-6273(03)00168-5
PubMed:View item in PubMed

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