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- W2149604163 abstract "summary Nuclear magnetic resonance spectroscopy was used to monitor 15 NH 4 + assimilation and amino acid biosynthesis in the ectomycorrhizal basidiomycete Laccaria bicolor (Maire) Orton. (strain S238). In mycelium growing rapidly on 15 NH 4 + , [ amido ‐ 15 N]glutamine was the major 15 N‐labelled species. When 15 N‐labelled mycelium was transferred into medium containing 14 NH 4 + , the resonance for [ amino ‐ 15 N]glutamine decreased with a half‐life of about 3.0 h, whereas the resonance for [ amino ‐ 15 N]glutamine remained unchanged. Such behaviour is consistent with glutamine synthetase (GS) being the major route of 15 NH 4 + assimilation. However, the higher accumulation of [ 15 N]alanine observed in the presence of the GS inhibitor, methionine sulfoximine, indicated that a part of the glutamate pool was formed by the glutamate dehydrogenase (GDH) pathway. When the mycelium was in stationary phase (i.e. low extracellular NH 4 + ), the intramolecular 15 N labelling of glutamine suggested that the GDH and GS pathways were simultaneously assimilating NH 4 + . The N supply and the growth stage, therefore, influence the expression of the activities of GDH and GS. The current isotopic data identify other fates of absorbed 15 N: glutamate decarboxylation gives rise to γ‐aminobutyrate; transamination between glutamate and pyruvate yields alanine; and arginine accumulates. It is concluded that GS is the main pathway of primary assimilation of NH 4 + in L. bicolor , but GDH may also contribute significantly to this process." @default.
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- W2149604163 date "1994-11-01" @default.
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- W2149604163 title "NH<sub>4</sub><sup>+</sup> assimilation in the ectomycorrhizal basidiomycete <i>Laccaria bicolor</i> (Maire) Orton, a <sup>15</sup>N‐NMR study" @default.
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- W2149604163 doi "https://doi.org/10.1111/j.1469-8137.1994.tb02994.x" @default.
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