Abstract
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.
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We thank Mrs. Annie Buchwalter for English editing.
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Our work was partially funded by grants from the Deutsche Forschungsgemeinschaft (Gottfried-Wilhelm-Leibniz; DFG WI1994/2-1 and 2-2).
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Müller, T., Neuhäuser, B., Ludewig, U. et al. New insights into HcPTR2A and HcPTR2B, two high-affinity peptide transporters from the ectomycorrhizal model fungus Hebeloma cylindrosporum. Mycorrhiza 30, 735–747 (2020). https://doi.org/10.1007/s00572-020-00983-7
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DOI: https://doi.org/10.1007/s00572-020-00983-7