New insights into HcPTR2A and HcPTR2B, two high-affinity peptide transporters from the ectomycorrhizal model fungus Hebeloma cylindrosporum

Tobias Müller (1) , Benjamin Neuhäuser (2) , Uwe Ludewig (2) , Gabriella Houdinet (3) , Sabine Zimmermann (3) , Pierre-Emmanuel Courty (4) , Daniel Wipf (4)

1 IZMB, Transport in Ectomycorrhiza
2 University of Hohenheim
3 BPMP - Biochimie et Physiologie Moléculaire des Plantes
4 Agroécologie [Dijon]

While plants mainly rely on the use of inorganic nitrogen sources like ammonium and nitrate, soil-borne microorganisms like the ectomycorrhizal fungus Hebeloma cylindrosporum can also take up soil organic N in the form of amino acids and peptides that they use as nitrogen and carbon sources. Following the previous identification and functional expression in yeast of two PTR-like peptide transporters, the present study details the functions and substrates of HcPTR2A and HcPTR2B by analysing their transport kinetics in Xenopus laevis oocytes. While both transporters mediated high-affinity di- and tripeptide transport, HcPTR2A also showed low-affinity transport of several amino acids-mostly hydrophobic ones with large side chains.

Mots clés: Heterologous expression; Peptide transporter; Gene expression; Ectomycorrhiza; ectomycorrhiza; peptide transporter; gene expression; heterologous expression

Domaines: Biologie végétale; Sciences du Vivant [q-bio]

Tobias Müller, Benjamin Neuhäuser, Uwe Ludewig, Gabriella Houdinet, Sabine Zimmermann, et al.. New insights into HcPTR2A and HcPTR2B, two high-affinity peptide transporters from the ectomycorrhizal model fungus Hebeloma cylindrosporum. Mycorrhiza, 2020, ⟨10.1007/s00572-020-00983-7⟩. ⟨hal-02922805⟩