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Conversion of Phenylalanine into Tyrosine by Portulaca Callus ¹

Institut für Genetik und Pflanzenphysiologie, 240, Universität Hohenheim, 7000 Stuttgart-Hohenheim

The incorporation of [¹⁴C]phenylalanine and [1,6-¹⁴C]shikimic acid into tyrosine was investigated in the callus of Portulaca grandiflora, var. JR (L.). By inhibiting phenylalanine with 1--aminooxy--phenyl-propionic acid and tyrosinase with 1-cysteine-HCl and hydrazine-hydrate, the possible synthesis of tyrosine from phenylalanine was demonstrated. Tetrahydropterine sulfate was an effective activator of this pathway and tyrosine accumulation via 4-hydroxy-prephenic acid is regulated by feedback inhibition. L--Amminooxy--phenylpropionic acid inhibits both phenylalanine ammonia-lyase and the production of phenylalanine from prephenic acid.