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Metabolic fate of nicotinamide in higher plants
Author(s) -
Matsui Ayu,
Yin Yuling,
Yamanaka Keiko,
Iwasaki Midori,
Ashihara Hiroshi
Publication year - 2007
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2007.00959.x
Subject(s) - trigonelline , nicotinamide , biochemistry , nad+ kinase , chemistry , biology , botany , enzyme
Metabolism of [carbonyl‐ 14 C]nicotinamide was surveyed in various plant materials including the model plants, Arabidopsis thaliana , Oryza sativa and Lotus japonicus . In all plants studied, nicotinamide was used for the pyridine (nicotinamide adenine) nucleotide synthesis, probably after conversion to nicotinic acid. Radioactivity from [carbonyl‐ 14 C]nicotinamide was incorporated into trigonelline (1‐ N ‐methylnicotinic acid) and/or into nicotinic acid 1 N ‐glucoside (Na‐Glc). Trigonelline is formed mainly in leaves and cell cultures of O. sativa and L. japonicus and in seedlings of Trifolium incarnatum , Medicago sativa and Raphanus sativus . Trigonelline synthesis from nicotinamide is generally greater in leaves than in roots. Na‐Glc was formed as the major nicotinic acid conjugate in A. thaliana and in tobacco Bright Yellow‐2 cells. In seedlings of Chrysanthemum coronarium and Theobroma cacao , both trigonelline and Na‐Glc were synthesized from [carbonyl‐ 14 C]nicotinamide. Trigonelline is accumulated in some seeds, mainly Leguminosae species. The pattern of formation of the nicotinic acid conjugates differs between species and organs.