Conversion of Phenylalanine into Tyrosine by Portulaca Callus | Zendy

Rudolf Endreß | Zendy

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Conversion of Phenylalanine into Tyrosine by Portulaca Callus

Author(s) -

Rudolf Endreß

Publication year - 1981

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.68.2.272

Subject(s) - phenylalanine , shikimic acid , tyrosine , biochemistry , chemistry , callus , phenylalanine ammonia lyase , portulaca , cysteine , amino acid , enzyme , biology , botany

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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