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Conversion of phenylalanine into tyrosine by portulaca callus



Conversion of phenylalanine into tyrosine by portulaca callus



Plant Physiology 68(2): 272-274



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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Accession: 000848360

Download citation: RISBibTeXText

PMID: 16661900

DOI: 10.1104/pp.68.2.272


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Conversion of phenyl alanine into tyrosine by portulaca grandiflora callus. Plant Physiology 68(2): 272-274, 1981

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