Phenylalanine Hydroxylase Deficiency and Diet Tyrosine is...

Name: Problem 7, Chapter 22: Principles of Biochemistry
Uploaded: 2021-05-27T01:04:16-08:00
Duration: 1 min 59 s
Channel: Bryan Valdivia
Description: Phenylalanine Hydroxylase Deficiency and Diet Tyrosine is normally a nonessential amino acid, but individuals with a genetic defect in phenylalanine hydroxylase require tyrosine in their diet for normal growth. Explain.

Phenylalanine Hydroxylase Deficiency and Diet Tyrosine is normally a nonessential amino acid, but individuals with a genetic defect in phenylalanine hydroxylase require tyrosine in their diet for normal growth. Explain.

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Key Concepts

Inborn Errors of Metabolism

Genetic defects like a deficiency in phenylalanine hydroxylase are examples of inborn errors of metabolism. These genetic enzyme deficiencies lead to metabolic disorders which often require careful dietary management, including supplementation of normally nonessential compounds when synthesis is impaired.

Enzyme Function in Amino Acid Metabolism

Enzymes like phenylalanine hydroxylase convert one amino acid to another—in this case, converting phenylalanine into tyrosine. A deficiency in this enzyme disrupts normal metabolic pathways, leading to an accumulation of phenylalanine and a deficiency of tyrosine, which is necessary for various synthesis processes in the body.

Nonessential vs Essential Amino Acids

Typically, tyrosine is considered a nonessential amino acid because it can be synthesized from phenylalanine. However, when the conversion enzyme is deficient, the body cannot produce enough tyrosine, thereby making it an essential amino acid that must be obtained from the diet.

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