Ch.18 Metabolic Pathways and ATP Production

Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 13th Edition

Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Non è quello che usi tu?Cambia libro di testo

Timberlake 13th Edition

Ch.18 Metabolic Pathways and ATP Production

Problema 92d

Capitolo 18, Problema 92d

What metabolic substrate(s) can be produced from the carbon atoms of each of the following amino acids?
d. phenylalanine

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Understand the problem: The question asks which metabolic substrate(s) can be produced from the carbon atoms of the amino acid phenylalanine. This involves identifying the metabolic pathway phenylalanine undergoes and the intermediates it produces.

Recall the metabolic pathway: Phenylalanine is an aromatic amino acid that is primarily metabolized through the phenylalanine hydroxylase pathway. It is converted into tyrosine, which is then further metabolized.

Identify the metabolic intermediates: Tyrosine, derived from phenylalanine, enters the catabolic pathway where it is broken down into fumarate and acetoacetate. These are key intermediates in the citric acid cycle and ketogenesis, respectively.

Classify the metabolic substrates: Fumarate is a glucogenic substrate because it can be converted into glucose via gluconeogenesis. Acetoacetate is a ketogenic substrate because it can be used to produce ketone bodies.

Conclude the answer: The carbon atoms of phenylalanine can produce both glucogenic (fumarate) and ketogenic (acetoacetate) substrates, making phenylalanine both glucogenic and ketogenic.

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Amino Acid Metabolism

Amino acid metabolism involves the biochemical processes that break down amino acids for energy or convert them into other compounds. Each amino acid can be transformed into various metabolic substrates, such as glucose or fatty acids, depending on its structure and the body's needs. Understanding these pathways is crucial for determining the metabolic fate of specific amino acids.

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Amino Acid Catabolism: Amino Group Example 2

Phenylalanine Catabolism

Phenylalanine is an essential amino acid that undergoes catabolism primarily through the phenylalanine hydroxylase enzyme, converting it into tyrosine. Tyrosine can then be further metabolized into important neurotransmitters and hormones, such as dopamine and norepinephrine. This pathway highlights the significance of phenylalanine in producing vital biological molecules.

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Amino Acid Catabolism: Carbon Atoms Concept 1

Metabolic Substrates

Metabolic substrates are the molecules that serve as the starting materials for metabolic reactions, providing the necessary carbon skeletons for energy production or biosynthesis. In the context of amino acids, these substrates can include intermediates that enter the citric acid cycle or precursors for glucose synthesis. Identifying the substrates derived from phenylalanine is essential for understanding its role in metabolism.

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Enzyme-Substrate Complex Concept 1

Pratica correlata

Domanda del libro di testo

One cell at work may break down 2 million (2 000 000) ATP molecules in one second. Some researchers estimate that the human body has about 10¹³ cells.

b. If ATP has a molar mass of 507 g/mole, how many grams of ATP are hydrolyzed in one day?

1037

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Domanda del libro di testo

State if each of the following processes release or require ATP:

g. activation of a fatty acid

688

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Domanda del libro di testo

State if each of the following processes release or require ATP:

f. first six reactions of glycolysis

650