title: AtNPF5.5, a nitrate transporter affecting nitrogen accumulation in Arabidopsis embryo.
abstract: Dipeptide (Leu-Leu) and nitrate transport activities of 26 Arabidopsis NPF (NRT1/PTR Family) proteins were screened in Saccharomyces cerevisiae and Xenopus laevis oocytes, respectively. Dipeptide transport activity has been confirmed for 2 already known dipeptide transporters (AtNPF8.1 and AtNPF8.3) but none of the other tested NPFs displays dipeptide transport. The nitrate transport screen resulted in the identification of two new nitrate transporters, AtNPF5.5 and AtNPF5.10. The localization of the mRNA coding for NPF5.5 demonstrates that it is the first NPF transporter reported to be expressed in Arabidopsis embryo. Two independent homozygous npf5.5 KO lines display reduced total nitrogen content in the embryo as compared to WT plants, demonstrating an effect of NPF5.5 function on the embryo nitrogen content. Finally, NPF5.5 gene produces two different transcripts (AtNPF5.5a and AtNPF5.5b) encoding proteins with different N-terminal ends. Both proteins are able to transport nitrate in xenopus oocytes.
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Léran
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Bharti
authors.initials: B
authors.lastname: Garg
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Boursiac
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Corratgé-Faillie
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Chantal
authors.initials: C
authors.lastname: Brachet
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Tillard
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Gojon
authors.affiliation: Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes «Claude Grignon», UMR CNRS/INRA/SupAgro/UM2, Place Viala, 34060 Montpellier cedex, France.
authors.forename: Benoît
authors.initials: B
authors.lastname: Lacombe
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D027321:Anion Transport Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000196:embryology* / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000378:metabolism*; D001692:Biological Transport; D004151:Dipeptides / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D055786:Gene Knockout Techniques; D008969:Molecular Sequence Data; D000091285:Nitrate Transporters; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism*; D009865:Oocytes / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D012639:Seeds / Q000378:metabolism*; D014981:Xenopus
chemical_list: D027321:Anion Transport Proteins; D029681:Arabidopsis Proteins; D004151:Dipeptides; D000091285:Nitrate Transporters; D009566:Nitrates; D012333:RNA, Messenger; D009584:Nitrogen