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Calystegines biosynthesis

A. General Route of Calystegine Biosynthesis Putrescine N-Methyltransferase Tropinone Reductases... [Pg.49]

Scholl Y, Schneider B, Drager B (2003) Biosynthesis of calystegines NNMR and kinetics of formation in root cultures of Calystegia sepium. Phytochemistry 62(3) 325-332... [Pg.357]

Tropane alkaloid Biosynthesis Scopolamine, nicotine, hygrine, calystegines Bl, calystegines B2, spermidine, spermine, cocaine, tropinone, littorine, tropine... [Pg.417]

Fig. 3.2 Biosynthesis of the lV-methyl-A -pyrrolimum cation, precursor of simple pyrrohdine alkaloids, pyrroUdides, nicotinoids, tropanes, calystegines, and (presumably) indoUzidines... Fig. 3.2 Biosynthesis of the lV-methyl-A -pyrrolimum cation, precursor of simple pyrrohdine alkaloids, pyrroUdides, nicotinoids, tropanes, calystegines, and (presumably) indoUzidines...
Kato A, Asano N, Kizu H, Matsui K, Suzuki S, Arisawa M (1997) Calystegine alkaloids from Duboisia leichhardtii. Phytochemistry 45 425-429 Keiner R, Nakajami K, Hashimoto T, Drager B (2000) Accumulation and biosynthesis of calystegines in potato. J Appl Bot/Angew Bot 74 122-125... [Pg.199]

A pair of tropinone reductases, TR-I and TR-n, constitutes a branching point in the biosynthesis of TAs [218,219]. While TR-I diverts the pathway towards the production of scopolamine, TR-n diverts it towards the biosynthesis of calystegine. Overexpression of TR-I or TR-II nnder constitutive promoters altered the ratio of tropine-derived alkaloids versus pseu-dotropine-derived alkaloids in root culture lines of Atropa belladonna [220]. [Pg.454]

Location of Biosynthesis and Possible Transport Calystegines as Demethylated Tropane Alkaloids Chemical Synthesis Biochemical Activities... [Pg.49]

The nortropane skeleton is a characteristic feature of most calystegines, implying that during the biosynthesis the N-methyl group of the initial tropane skeleton was lost. There are clues for the assumption that N-demethylation occurs as next metabolic step after formation of pseudotropine (12). Norpseudotropine (13) was isolated from M. albus fruits (28). In C. sepium root cultures, norpseudotropine was detectable on application of millimolar concentrations of external tropinone (32) (Sichhart, Meier, and Drager, unpublished). In the Solanaceae, demethylation of the nitrogen in the tropane skeleton is not unusual. Several esterified... [Pg.81]

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See also in sourсe #XX -- [ Pg.71 , Pg.72 , Pg.73 ]



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