title: Structure of a prokaryotic fumarate transporter reveals the architecture of the SLC26 family.
abstract: The SLC26 family of membrane proteins combines a variety of functions within a conserved molecular scaffold. Its members, besides coupled anion transporters and channels, include the motor protein Prestin, which confers electromotility to cochlear outer hair cells. To gain insight into the architecture of this protein family, we characterized the structure and function of SLC26Dg, a facilitator of proton-coupled fumarate symport, from the bacterium Deinococcus geothermalis. Its modular structure combines a transmembrane unit and a cytoplasmic STAS domain. The membrane-inserted domain consists of two intertwined inverted repeats of seven transmembrane segments each and resembles the fold of the unrelated transporter UraA. It shows an inward-facing, ligand-free conformation with a potential substrate-binding site at the interface between two helix termini at the center of the membrane. This structure defines the common framework for the diverse functional behavior of the SLC26 family.
authors.affiliation: Department of Biochemistry, University of Zurich, Zurich, Switzerland.|Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt am Main, Germany.
authors.forename: Eric R
authors.initials: ER
authors.lastname: Geertsma
authors.affiliation: Department of Biochemistry, University of Zurich, Zurich, Switzerland.|Institute of Biochemistry, Biocenter, Goethe-University Frankfurt, Frankfurt am Main, Germany.
authors.forename: Yung-Ning
authors.initials: YN
authors.lastname: Chang
authors.affiliation: Department of Biochemistry, University of Zurich, Zurich, Switzerland.
authors.forename: Farooque R
authors.initials: FR
authors.lastname: Shaik
authors.affiliation: Department of Biochemistry, University of Zurich, Zurich, Switzerland.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Neldner
authors.affiliation: Structural Biology Research Center, Vlaams Instituut voor Biotechnologie, Brussels, Belgium.|Structural Biology Brussels, Vrije Universiteit Brussel, Brussels, Belgium.
authors.forename: Els
authors.identifier: http://orcid.org/0000-0002-2466-0172
authors.initials: E
authors.lastname: Pardon
authors.affiliation: Structural Biology Research Center, Vlaams Instituut voor Biotechnologie, Brussels, Belgium.|Structural Biology Brussels, Vrije Universiteit Brussel, Brussels, Belgium.
authors.forename: Jan
authors.initials: J
authors.lastname: Steyaert
authors.affiliation: Department of Biochemistry, University of Zurich, Zurich, Switzerland.
authors.forename: Raimund
authors.initials: R
authors.lastname: Dutzler
mesh_terms: D027321:Anion Transport Proteins / Q000737:chemistry* / Q000378:metabolism; D001483:Base Sequence; D002850:Chromatography, Gel; D003001:Cloning, Molecular; D018360:Crystallography, X-Ray; D017931:DNA Primers / Q000235:genetics; D034301:Deinococcus / Q000235:genetics*; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli; D005453:Fluorescence; D005650:Fumarates / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D016366:Open Reading Frames / Q000235:genetics; D016133:Polymerase Chain Reaction; D011487:Protein Conformation; D012645:Selenomethionine; D017422:Sequence Analysis, DNA
chemical_list: D027321:Anion Transport Proteins; D017931:DNA Primers; D005650:Fumarates; D012645:Selenomethionine