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Phenylalanine hydroxylase deficiency

Genetics in Medicine, 2011
Phenylalanine hydroxylase deficiency is an autosomal recessive disorder that results in intolerance to the dietary intake of the essential amino acid phenylalanine. It occurs in approximately 1:15,000 individuals. Deficiency of this enzyme produces a spectrum of disorders including classic phenylketonuria, mild phenylketonuria, and mild ...
Yannis Trakadis, Charles R. Scriver, John J. Mitchell   +2 more
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Isozymes of Phenylalanine Hydroxylase [PDF]

Science, 1972
Three isozymes of phenylalanine hydroxylase exist in adult rat liver. They are chromatographically unique. Partial characterization suggests that they are similar in chemical properties and differ only in charge. Estimation of the Stokes radii indicates that the isozymes have similar molecular weights of about 200,000. Two isozymes exist in human fetal
Paul J. Geiger, John A. Barranger, A. Huzino, Samuel P. Bessman   +3 more
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Phenylalanine hydroxylase mutations and phenylalanine-tyrosine metabolism in heterozygotes for phenylalanine hydroxylase deficiency

Acta Paediatrica, 2002
The aim of this study was to determine whether any relationship exists between the severity of mutation of the phenylalanine hydroxylase (PAH) gene and the plasma concentrations of phenylalanine (Phe) and tyrosine (Tyr) under fasting and semifasting conditions among heterozygotes in a matched case-control study.
E. Verduci, E. Riva, C. Agostoni, S. Leviti, L. Fiori, A.M. Lammardo, M. L. Biondi, M. Giovannini   +7 more
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Phenylalanine Hydroxylase Activity

Archives of Pediatrics & Adolescent Medicine, 1983
Sir .—In the article, "Diagnosis of Phenylalanine Hydroxylase Deficiency (Phenylketonuria)" (Journal1982;136:111-114), we are concerned by the recommendation of Berry and collegues that centers treating patients with phenylketonuria (PKU) should " . . .
David M. Danks, Richard G.H. Cotton
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Characterization of phenylalanine hydroxylase

Biochemistry, 1986
Iron can be bound to phenylalanine hydroxylase (PAH) in two environments. The assignment of the electron paramagnetic resonance spectrum of PAH to two, overlapping high-spin ferric signals is confirmed by computer simulation. Both environments are shown to be populated in the crude enzyme.
L. M. Bloom, Stephen J. Benkovic, Betty J. Gaffney   +2 more
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PHENYLALANINE-HYDROXYLASE ACTIVITY IN HYPERPHENYLALANINÆMIA

The Lancet, 1967
Abstract Phenylalanine-hydroxylase activities have been determined in two cases of " classic " phenylketonuria and in two cases of hyperphenylalaninaemia without phenylketonuria. The patients with phenylketonuria showed no phenylalanine-hydroxylase activity; and this was confirmed as being due to deficiency of enzyme, not cofactor.
Parvin Justice, David Yi-Yung Hsia, MargaretE. O'Flynn   +2 more
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Pyrimidines as cofactors for phenylalanine hydroxylase

Biochemical and Biophysical Research Communications, 1978
Abstract It has been generally assumed that a tetrahydropterin (2-amino-5,6,7,8-tetrahydro-4-pteridinone) is essential for activity of the three aromatic amino acid hydroxylases. In this report it is shown that appropriately substituted pyrimidines can assume the role of cofactor for phenylalanine hydroxylase.
J.E. Ayling, S.W. Bailey
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Activation of phenylalanine hydroxylase by phenylalanine

Biochimica et Biophysica Acta (BBA) - Enzymology, 1971
Abstract 1. 1. Phenylalanine activates phenylalanine hydroxylase ( l -phenylalanine, tetrahydropteridine:oxygen oxidoreductase (4-hydroxylating), EC 1.14.3.1), when dithiothreitol is used to regenerate 2-amino-4-hydroxy-6,7-dimethyltetrahydropteridine. 2. 2.
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