Conserved Dimeric Subunit Stoichiometry of SLC26 Multifunctional Anion Exchangers
| Autor: | Ina Martin, Christoph Fahlke, Heike Lauks, Sonja Meyer zu Berstenhorst, Delany Torres-Salazar, Günther Schmalzing, Michael Schänzler, Patricia Hidalgo, Silvia Detro-Dassen, Doreen Nothmann |
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| Rok vydání: | 2008 |
| Předmět: |
Gene isoform
biology Protein subunit Anion Transport Proteins Xenopus Cell Biology biology.organism_classification Biochemistry Rats Transport protein Motor protein Xenopus laevis Chloride Channels Sulfate Transporters biology.protein Animals Humans Gene family Electrophoresis Polyacrylamide Gel Protein quaternary structure sense organs Prestin Dimerization Molecular Biology |
| Zdroj: | Journal of Biological Chemistry. 283:4177-4188 |
| ISSN: | 0021-9258 |
| Popis: | The SLC26 gene family encodes multifunctional transport proteins in numerous tissues and organs. Some paralogs function as anion exchangers, others as anion channels, and one, prestin (SLC26A5), represents a membrane-bound motor protein in outer hair cells of the inner ear. At present, little is known about the molecular basis of this functional diversity. We studied the subunit stoichiometry of one bacterial, one teleost, and two mammalian SLC26 isoforms expressed in Xenopus laevis oocytes or in mammalian cells using blue native PAGE and chemical cross-linking. All tested SLC26s are assembled as dimers composed of two identical subunits. Co-expression of two mutant prestins with distinct voltage-dependent capacitances results in motor proteins with novel electrical properties, indicating that the two subunits do not function independently. Our results indicate that an evolutionarily conserved dimeric quaternary structure represents the native and functional state of SLC26 transporters. |
| Databáze: | OpenAIRE |
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