Abstract
Phenylpyruvic acid (PPA) and 4-hydroxyphenylpyruvic acid (PHPA) were supplied separately to leafy cuttings of Quercus pedunculata. After metabolic periods of 2 to 8 h, tyrosine and phenylalanine amounts were estimated. PHPA stimulates tyrosine biosynthesis only, whereas PPA was found to be a good precursor of both tyrosine and phenylalanine; its efficiency in tyrosine formation is very similar to that of PHPA. Some possible metabolic routes from PPA to tyrosine were investigated in vivo, using [ 14C]phenylalanine and by trapping experiments with [ 14C]-shikimic acid. The observed transformation seems not to be due to direct hydroxylation of the phenyl compounds (PPA or phenylalanine). Preliminary results suggest more complex mechanisms involving partial or complete degradation of the PPA molecule.
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