Use of 15N reverse gradient two-dimensional nuclear magnetic resonance spectroscopy to follow metabolic activity in Nicotiana plumbaginifolia cell-suspension cultures |
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Authors: | François Mesnard Nathalie Azaroual Danielle Marty Marc-André Fliniaux Richard J Robins Gaston Vermeersch Jean-Pierre Monti |
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Institution: | (1) Laboratoire de Biophysique, Groupe de Recherche des Biomolécules: Micro-environnement et Métabolisme, Faculté de Pharmacie, 1 rue des Louvels, 80037 Amiens cedex 1, France, FR;(2) Laboratoire d'Application RMN, Faculté de Pharmacie, BP 83, 59006 Lille cedex, France, FR;(3) Laboratoire de Phytotechnologie, Faculté de Pharmacie, 1 rue des Louvels, 80037 Amiens cedex 1, France, FR;(4) Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS ESA 6006, Faculté des Sciences, 2 rue de la Houssinière, 44322 Nantes cedex 3, France, FR |
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Abstract: | Nitrogen metabolism was monitored in suspension cultured cells of Nicotiana plumbaginifolia Viv. using nuclear magnetic resonance (NMR) spectroscopy following the feeding of (15NH4)2SO4 and K15NO3. By using two-dimensional 15N-1H NMR with heteronuclear single-quantum-coherence spectroscopy and heteronuclear multiple-bond-coherence spectroscopy sequences,
an enhanced resolution of the incorporation of 15N label into a range of compounds could be detected. Thus, in addition to the amino acids normally observed in one-dimensional
15N NMR (glutamine, aspartate, alanine), several other amino acids could be resolved, notably serine, glycine and proline. Furthermore,
it was found that the peak normally assigned to the non-protein amino-acid γ-aminobutyric acid in the one-dimensional 15N NMR spectrum was resolved into a several components. A peak of N-acetylated compounds was resolved, probably composed of the intermediates in arginine biosynthesis, N-acetylglutamate and N-acetylornithine and, possibly, the intermediate of putrescine degradation into γ-aminobutyric acid, N-acetylputrescine. The occurrence of 15N-label in agmatine and the low detection of labelled putrescine indicate that crucial intermediates of the pathway from glutamate
to polyamines and/or the tobacco alkaloids could be monitored. For the first time, labelling of the peptide glutathione and
of the nucleotide uridine could be seen.
Received: 29 March 1999 / Accepted: 15 July 1999 |
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Keywords: | : Alkaloid – Nicotiana (N metabolism) – Nitrogen metabolism |
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