Conversion of Phenylalanine into Tyrosine by Portulaca Callus

  • Endress R
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Abstract

The incorporation of [(14)C]phenylalanine and [1,6-(14)C]shikimic acid into tyrosine was investigated in the callus of Portulaca grandiflora, var. JR (L.). By inhibiting phenylalanine with 1-alpha-aminooxy-beta-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-alpha-Amminooxy-beta-phenylpropionic acid inhibits both phenylalanine ammonia-lyase and the production of phenylalanine from prephenic acid.

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Endress, R. (1981). Conversion of Phenylalanine into Tyrosine by Portulaca Callus. Plant Physiology, 68(2), 272–274. https://doi.org/10.1104/pp.68.2.272

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