title: Functional characterization of the Escherichia coli K-12 yiaMNO transport protein genes.
abstract: The yiaMNO genes of Escherichia coli K-12 encode a binding protein-dependent secondary, or tri-partite ATP-independent periplasmic (TRAP), transporter. Since only a few members of this family have been functionally characterized to date, we aimed to identify the substrate for this transporter. Cells that constitutively express the yiaK-S gene cluster metabolized the rare pentose L-xylulose, while deletion of the yiaMNO transporter genes reduced L-xylulose metabolism. The periplasmic substrate-binding protein YiaO was found to bind L-xylulose, and stimulated L-xylulose uptake by spheroplasts. These date indicate that the yiaMNO transporter mediates uptake of this rare pentose.
authors.affiliation: Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands.
authors.forename: Titia H
authors.initials: TH
authors.lastname: Plantinga
authors.forename: Chris
authors.initials: C
authors.lastname: Van Der Does
authors.forename: Josefa
authors.initials: J
authors.lastname: Badia
authors.forename: Juan
authors.initials: J
authors.lastname: Aguilar
authors.forename: Wil N
authors.initials: WN
authors.lastname: Konings
authors.forename: Arnold J M
authors.initials: AJ
authors.lastname: Driessen
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000378:metabolism; D001483:Base Sequence; D001692:Biological Transport / Q000235:genetics; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D002876:Chromosomes, Bacterial; D003001:Cloning, Molecular; D029968:Escherichia coli Proteins / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D026901:Membrane Transport Proteins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009876:Operon / Q000235:genetics; D015183:Restriction Mapping; D013104:Spheroplasts / Q000378:metabolism; D014996:Xylulose / Q000378:metabolism*
chemical_list: D018528:ATP-Binding Cassette Transporters; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D026901:Membrane Transport Proteins; D014996:Xylulose