title: A novel family of transporters mediating the transport of glutathione derivatives in plants.
abstract: Uptake and compartmentation of reduced glutathione (GSH), oxidized glutathione (GSSG), and glutathione conjugates are important for many functions including sulfur transport, resistance against biotic and abiotic stresses, and developmental processes. Complementation of a yeast (Saccharomyces cerevisiae) mutant (hgt1) deficient in glutathione transport was used to characterize a glutathione transporter cDNA (OsGT1) from rice (Oryza sativa). The 2.58-kb full-length cDNA (AF393848, gi 27497095), which was obtained by screening of a cDNA library and 5'-rapid amplification of cDNA ends-polymerase chain reaction, contains an open reading frame encoding a 766-amino acid protein. Complementation of the hgt1 yeast mutant strain with the OsGT1 cDNA restored growth on a medium containing GSH as the sole sulfur source. The strain expressing OsGT1 mediated [3H]GSH uptake, and this uptake was significantly competed not only by unlabeled GSSG and GS conjugates but also by some amino acids and peptides, suggesting a wide substrate specificity. OsGT1 may be involved in the retrieval of GSSG, GS conjugates, and nitrogen-containing peptides from the cell wall.
authors.affiliation: Unité Mixte de Recherche Centre National de la Recherche Scientifique 6161, Transport des Assimilats, Laboratoire de Physiologie, Biochimie et Biologie Moléculaires Végétales, Unité de Formation et de Recherche Sciences, Poitiers, France.
authors.forename: Ming-Yong
authors.initials: MY
authors.lastname: Zhang
authors.forename: Andrée
authors.initials: A
authors.lastname: Bourbouloux
authors.forename: Olivier
authors.initials: O
authors.lastname: Cagnac
authors.forename: Chittur V
authors.initials: CV
authors.lastname: Srikanth
authors.forename: Doris
authors.initials: D
authors.lastname: Rentsch
authors.forename: Anand K
authors.initials: AK
authors.lastname: Bachhawat
authors.forename: Serge
authors.initials: S
authors.lastname: Delrot
mesh_terms: D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D018744:DNA, Plant / Q000235:genetics / Q000302:isolation & purification; D004734:Energy Metabolism; D005816:Genetic Complementation Test; D016680:Genome, Bacterial; D005978:Glutathione / Q000378:metabolism*; D026901:Membrane Transport Proteins; D009154:Mutation; D012275:Oryza / Q000235:genetics / Q000378:metabolism*; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D018076:DNA, Complementary; D018744:DNA, Plant; D026901:Membrane Transport Proteins; D010940:Plant Proteins; C086860:glutathione transporter; D005978:Glutathione