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Biosynthèse de la sticticine chez le lichen Lobaria laetevirens
Author(s) -
Bernard T.,
Goas G.
Publication year - 1981
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.1399-3054.1981.tb05046.x
Subject(s) - thallus , lichen , tyrosine , biosynthesis , botany , biochemistry , hydroxylation , stereochemistry , chemistry , biology , enzyme
Biosynthesis of sticticin in the lichen Lobaria laetevirens (Lightf.) Zahlbr . Sticticin is the most important soluble nitrogenous compound in the thallus of L. laetevirens from which it was isolated for the first time. As its concentration can exceed 1 M when thallus water content reaches 10–12%, it might play an efficient role in osmoregulation. Its biosynthesis was investigated by supplying the lichen with L‐[U‐14C]tyrosine, DL‐3,4‐dihydroxyphenyl [3‐ 14 C]alanine and L‐[methyl‐ 14 C]me‐thionine. The main pathway involves, first, N‐methylations of tyrosine, then a hydroxylation of the ring and finally an esterification of the acid function.