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Background: Phenylketonuria is an inherited disease which results from the lack of the enzyme
phenylalanine hydroxylase (PAH). The PAH enzyme catalyzes the first step in the degradation of
phenylalanine, as shown in Figure 30.1. In the phenylketonuric patient, phenylalanine accumulates
which is eventually transaminated to phenylpyruvate, a phenylketone compound. Excess
phenylpyruvate accumulates in the blood and urine and has the effect of causing mental
retardation if untreated. Screening programs identify PKU babies at birth, and treatment consists
of a low phenylalanine diet until maturation of the brain is completed. The structure and
biochemical properties of the PAH enzyme have been well-studied.The gene for PAH has been
isolated and has been localized to chromosome 12. The PAH enzyme is a protein 451 amino
acids in length with a molecular weight of 51,900 daltons. More than 60 different mutant genes
giving rise to nonfunctional PAH proteins have been identified in PKU patients.
Question:Kinetic data in which PAH activity is compared with and without preincubation with
phenylalanine is shown in Figure 30.3. Give a structural basis for the interpretation of these data.
Figure 30.1. Phenylalanine and tyrosine meravurior. an essential cofactor for phenylalanine
hydroxylase. 95Figure 30.1. Phenylalanine and tyrosmio ..... an essential cofactor for
phenylalanine hydroxylase. 95

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Background Phenylketonuria is an inherited disease which re.pdf

  • 1. Background: Phenylketonuria is an inherited disease which results from the lack of the enzyme phenylalanine hydroxylase (PAH). The PAH enzyme catalyzes the first step in the degradation of phenylalanine, as shown in Figure 30.1. In the phenylketonuric patient, phenylalanine accumulates which is eventually transaminated to phenylpyruvate, a phenylketone compound. Excess phenylpyruvate accumulates in the blood and urine and has the effect of causing mental retardation if untreated. Screening programs identify PKU babies at birth, and treatment consists of a low phenylalanine diet until maturation of the brain is completed. The structure and biochemical properties of the PAH enzyme have been well-studied.The gene for PAH has been isolated and has been localized to chromosome 12. The PAH enzyme is a protein 451 amino acids in length with a molecular weight of 51,900 daltons. More than 60 different mutant genes giving rise to nonfunctional PAH proteins have been identified in PKU patients. Question:Kinetic data in which PAH activity is compared with and without preincubation with phenylalanine is shown in Figure 30.3. Give a structural basis for the interpretation of these data. Figure 30.1. Phenylalanine and tyrosine meravurior. an essential cofactor for phenylalanine hydroxylase. 95Figure 30.1. Phenylalanine and tyrosmio ..... an essential cofactor for phenylalanine hydroxylase. 95