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Aspects of cytotoxic lignan biosynthesis in suspension cultures of Linum nodiflorum

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Abstract

Plant cell suspension cultures of Linum flavum, Linum nodiflorum and Linum album have been used to characterize the growth and production of cytotoxic lignans as well as to study the biosynthesis of these lignans. A cell culture of Linum nodiflorum accumulated up to 1.7% of the cell dry weight as 6-methoxypodophyllotoxin in only nine days of cultivation. The biosynthesis of podophyllotoxin and 6-methoxypodophyllotoxin follows the formation of the first aryltetralin lignan deoxypodophyllotoxin. Hydroxylation in position 7 by deoxypodophyllotoxin 7-hydroxylase leads to podophyllotoxin. Hydroxylation in position 6 by the cytochrome P450 monooxygenase deoxypodophyllotoxin 6-hydroxylase yields β-peltatin which is further methylated by S-adenosylmethionine:β-peltatin 6-O-methyltransferase to β-peltatin-A methylether and then hydroxylated to 6-methoxypodophyllotoxin. Both, podophyllotoxin as well as 6-methoxypodophyllotoxin are stored as glucosides in the vacuole. Certain enzymes of these transformations have been isolated and characterized from Linum cell cultures.

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Kuhlmann, S., Kranz, K., Lücking, B. et al. Aspects of cytotoxic lignan biosynthesis in suspension cultures of Linum nodiflorum . Phytochemistry Reviews 1, 37–43 (2002). https://doi.org/10.1023/A:1015876001812

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