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What citric acid cycle intermediates are precursors to amino acids?
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Ch.25 Protein and Amino Acid Metabolism
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 25, Problema 14
Three metabolites that can result from the breakdown of the carbon skeleton of amino acids are ketone bodies, acetyl-CoA, and glucose. Briefly describe how each of these metabolites can be produced from amino acid catabolism.
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Amino acids are first deaminated, meaning their amino group (-NH2) is removed, leaving behind a carbon skeleton. This carbon skeleton can then enter various metabolic pathways depending on its structure.
Ketone bodies are produced when the carbon skeletons of ketogenic amino acids are converted into intermediates like acetoacetate or beta-hydroxybutyrate. These intermediates are formed during ketogenesis, which occurs in the liver, especially under conditions of low carbohydrate availability (e.g., fasting).
Acetyl-CoA is formed when the carbon skeletons of certain amino acids (both ketogenic and glucogenic) are broken down into two-carbon units. These units are then combined with coenzyme A to form acetyl-CoA, which can enter the citric acid cycle or be used for fatty acid synthesis.
Glucose is produced from the carbon skeletons of glucogenic amino acids through gluconeogenesis. These amino acids are converted into intermediates of the citric acid cycle (e.g., oxaloacetate) or other gluconeogenic precursors, which are then used to synthesize glucose in the liver or kidneys.
The specific pathway (ketone body formation, acetyl-CoA production, or glucose synthesis) depends on the type of amino acid (ketogenic, glucogenic, or both) and the metabolic needs of the body at the time of catabolism.
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Amino Acid Catabolism
Amino acid catabolism refers to the metabolic process where amino acids are broken down to produce energy or convert into other compounds. This process involves deamination, where the amino group is removed, allowing the carbon skeleton to enter various metabolic pathways, ultimately leading to the production of key metabolites like glucose, acetyl-CoA, and ketone bodies.
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2:21
Amino Acid Catabolism: Amino Group Concept 1
Acetyl-CoA Production
Acetyl-CoA is a central metabolite in energy production and biosynthesis. It can be produced from the breakdown of certain amino acids through a process called oxidative deamination, where the carbon skeleton is converted into acetyl-CoA, which then enters the citric acid cycle to generate ATP or serve as a building block for fatty acid synthesis.
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01:37Solubility Product Constant (Ksp) Concept 2
Ketone Bodies
Ketone bodies are water-soluble molecules produced in the liver from fatty acids and, to a lesser extent, from the catabolism of certain amino acids. During periods of low carbohydrate availability, such as fasting or prolonged exercise, amino acids can be converted into acetoacetate and beta-hydroxybutyrate, which serve as alternative energy sources for tissues, particularly the brain.
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1:41Ketone Bodies Example 1
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