Ureide permease 5 (AtUPS5) connects cell compartments involved in ureide metabolism

• Verfasst von: Lescano, Ignacio [VerfasserIn]
• Verfasst von: Bogino, María Florencia [VerfasserIn]
• Verfasst von: Martini, Carolina [VerfasserIn]
• Verfasst von: Tessi, Tomás María [VerfasserIn]
• Verfasst von: González, Claudio Alejandro [VerfasserIn]
• Verfasst von: Schumacher, Karin [VerfasserIn]
• Verfasst von: Desimone, Marcelo [VerfasserIn]
• Titel: Ureide permease 5 (AtUPS5) connects cell compartments involved in ureide metabolism
• Verf.angabe: Ignacio Lescano, María Florencia Bogino, Carolina Martini, Tomás María Tessi, Claudio Alejandro González, Karin Schumacher, and Marcelo Desimone
• E-Jahr: 2020
• Jahr: [March 2020]
• Umfang: 16 S.
• Fussnoten: Gesehen am 09.04.2020
• Titel Quelle: Enthalten in: Plant physiology
• Ort Quelle: Rockville, Md. : Soc., 1926
• Jahr Quelle: 2020
• Band/Heft Quelle: 182(2020), 3, Seite 1310-1325
• ISSN Quelle: 1532-2548
• DOI: doi:10.1104/pp.19.01136
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1694349365

Abstract

Allantoin is a purine oxidative product involved in long distance transport of organic nitrogen in nodulating legumes and was recently shown to play a role in stress tolerance in other plants. The subcellular localization of enzymes that catalyze allantoin synthesis and degradation indicates that allantoin is produced in peroxisomes and degraded in the endoplasmic reticulum (ER). Although it has been determined that allantoin is mostly synthesized in roots and transported to shoots either for organic nitrogen translocation in legumes or for plant protection during stress in Arabidopsis (Arabidopsis thaliana), the mechanism and molecular components of allantoin export from root cells are still unknown. AtUPS5 (Arabidopsis UREIDE PERMEASE 5) is a transmembrane protein that transports allantoin with high affinity when expressed in yeast. The subcellular fate of splicing variants AtUPS5L (long) and AtUPS5S (short) was studied by tagging them with fluorescent proteins in their cytosolic loops. The capability of these fusion proteins to complement the function of the native proteins was demonstrated by nutritional and salt stress experiments. Both variants localized to the ER, but the AtUPS5L variant was also detected in the trans-Golgi network/early endosome and at the plasma membrane. AtUPS5L and AtUPS5S localization indicates that they could have different roles in allantoin distribution between subcellular compartments. Our data suggest that under nonstress conditions UPS5L and UPS5S may function in allantoin degradation for nutrient recycling, whereas under stress, both genes may be involved in vesicular export allowing allantoin translocation from roots to shoots.