Journal Article

Metabolic Flux Analysis of the Phenylpropanoid Pathway in Wound-Healing Potato Tuber Tissue using Stable Isotope-Labeled Tracer and LC-MS Spectroscopy

Fumio Matsuda, Keiko Morino, Masahiro Miyashita and Hisashi Miyagawa

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 5, pages 510-517
Published in print May 2003 | ISSN: 0032-0781
Published online May 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg063
Metabolic Flux Analysis of the Phenylpropanoid Pathway in Wound-Healing Potato Tuber Tissue using Stable Isotope-Labeled Tracer and LC-MS Spectroscopy

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The metabolic flux of two phenylpropanoid metabolites, N-p-coumaroyloctopamine (p-CO) and chlorogenic acid (CGA), in the wound-healing potato tuber tissue was quantitatively analyzed by a newly developed method based upon the tracer experiment using stable isotope-labeled compounds and LC-MS. Tuber disks were treated with aqueous solution of l-phenyl-d5-alanine, and the change in the ratio of stable isotope-labeled compound to non-labeled (isotope abundance) was monitored for p-CO and CGA in the tissue extract by LC-MS. The time-dependent change in the isotope abundance of each metabolite was fitted to an equation that was derived from the formation and conversion kinetics of each compound. Good correlations were obtained between the observed and calculated isotope abundances for both p-CO and CGA. The rates of p-CO formation and conversion (i.e. fluxes) were 1.15 and 0.96 nmol (g FW)–1 h–1, respectively, and for CGA, the rates 4.63 and 0.42 nmol (g FW)–1 h–1, respectively. This analysis enabled a direct comparison of the biosynthetic activity between these two compounds.

Keywords: Keywords: Hydroxycinnamic acid conjugates — Metabolic flux analysis — Phenylpropanoid pathway.; Abbreviations: APCI, atmospheric pressure chemical ionization; CGA, chlorogenic acid; p-CO, N-p-coumaroyloctopamine; Phe, l-phenylalanine; Phe*, l-phenyl-d5-alanine; SIM, selected ion monitoring.

Journal Article.  5597 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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