Domanda del libro di testo
How do the following interactions help to stabilize the tertiary and quaternary structure of a protein? Give an example of a pair of amino acids that could give rise to each interaction.
b. Disulfide bonds
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Ch.18 Amino Acids and Proteins
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 18, Problema 93b
Explain how a protein is denatured by the following:
b. Strong acids
Guida verificata passo dopo passo1
Understand the concept of protein denaturation: Denaturation is the process by which a protein loses its native three-dimensional structure due to the disruption of non-covalent interactions, such as hydrogen bonds, ionic bonds, and hydrophobic interactions, without breaking its primary structure (sequence of amino acids).
Recognize the role of strong acids: Strong acids, such as HCl, can denature proteins by altering the pH of the environment. This change in pH affects the ionization of amino acid side chains, particularly those with acidic or basic groups.
Explain the disruption of ionic bonds: At low pH, the excess H⁺ ions from the strong acid can protonate negatively charged side chains (e.g., carboxylate groups, -COO⁻, become -COOH). This disrupts ionic bonds between oppositely charged side chains, destabilizing the protein's tertiary and quaternary structures.
Describe the effect on hydrogen bonding: The altered ionization of side chains can also interfere with hydrogen bonding patterns within the protein, further contributing to the loss of its native structure.
Summarize the outcome: As a result of these disruptions, the protein unfolds or aggregates, losing its functional shape. This process is irreversible in most cases, and the protein can no longer perform its biological function.
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Protein Structure
Proteins are composed of long chains of amino acids that fold into specific three-dimensional structures. These structures are crucial for their function and are categorized into four levels: primary, secondary, tertiary, and quaternary. The stability of these structures is maintained by various interactions, including hydrogen bonds, ionic bonds, and hydrophobic interactions.
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Percorso guidato
3:26
Quaternary Protein Structure Concept 1
Denaturation
Denaturation refers to the process where a protein loses its native structure due to external stressors, such as heat, pH changes, or chemical agents. This alteration disrupts the interactions that maintain the protein's shape, leading to a loss of function. Denatured proteins may aggregate or precipitate, which can be irreversible in some cases.
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Percorso guidato
1:17Digestion of Proteins Example 1
Effect of Strong Acids
Strong acids can denature proteins by significantly lowering the pH of the environment, which disrupts ionic and hydrogen bonds that stabilize the protein structure. This change in pH can lead to the protonation of amino acid side chains, altering their charge and interactions. As a result, the protein unfolds and loses its functional conformation.
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02:39Strong Acids and Bases
Pratica correlata
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As a chef, you prepare a wide variety of foods daily. The following dishes all contain protein. What method (if any) has been used to denature the protein present in each food?
a. Charcoal-grilled steak
Domanda del libro di testo
Give an example of a protein that has quaternary structure. How many polypeptide chains are present in this protein?
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Domanda del libro di testo
Explain how a protein is denatured by the following:
a. Heat
Domanda del libro di testo
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Domanda del libro di testo
Explain how a protein is denatured by the following:
c. Organic solvents
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