Phenylalanine hydroxylase (PAH) normally catalyzes the conversion of phenylalanine to tyrosine. In the absence of functional PAH, phenylalanine accumulates to high levels in the blood and is converted to phenylpyruvate and phenyllactate (Clemens et al. 1990; Langenbeck et al. 1992; Mitchell 2013). The extent of these conversions is modulated by genetic factors distinct from PAH, as siblings with the identical PAH defect can produce different amounts of them (Treacy et al. 1996).
Both L-amino acid oxidase (Boulland et al. 2004) and Kynurenine--oxoglutarate transaminase 3 (Han et al. 2004) can catalyze the conversion of phenylalanine to phenylpyruvate and lactate dehydrogenase can catalyze the conversion of the latter molecule to phenyllactate (Meister 1950), in reactions not annotated here.
|phenylketonuria||9281||[PKU, maternal phenylketonuria, Følling's disease, phenylalaninemia]|
|17356132||Human IL4I1 is a secreted L-phenylalanine oxidase expressed by mature dendritic cells that inhibits T-lymphocyte proliferation||Blood||2007|
|2116554||Plasma concentrations of phenyllactic acid in phenylketonuria||J Inherit Metab Dis||1990|
|15606768||pH dependence, substrate specificity and inhibition of human kynurenine aminotransferase I||Eur J Biochem||2004|
|1583868||A synopsis of the unconjugated acidic transamination metabolites of phenylalanine in phenylketonuria||J Inherit Metab Dis||1992|
|15421980||Reduction of alpha gamma-diketo and alpha-keto acids catalyzed by muscle preparations and by crystalline lactic dehydrogenase||J Biol Chem||1950|
|20301677||Phenylalanine Hydroxylase Deficiency||2013|
|8892014||In vivo disposal of phenylalanine in phenylketonuria: a study of two siblings||J Inherit Metab Dis||1996|