Domanda del libro di testo
The meat tenderizer used in cooking is primarily papain, a protease enzyme isolated from the fruit of the papaya tree. Why do you suppose papain is so effective at tenderizing meat?
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Ch.19 Enzymes and Vitamins
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 19, Problema 66
Why do allosteric enzymes have two types of binding sites?
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Allosteric enzymes are specialized proteins that regulate biochemical pathways by responding to the needs of the cell. They have two types of binding sites: the active site and the allosteric site.
The active site is where the substrate binds and undergoes a chemical reaction. This is the site responsible for the enzyme's catalytic activity.
The allosteric site is a separate location on the enzyme where regulatory molecules, called allosteric effectors, bind. These effectors can either activate or inhibit the enzyme's activity.
When an allosteric effector binds to the allosteric site, it induces a conformational change in the enzyme's structure. This change can either enhance or reduce the enzyme's ability to bind to the substrate at the active site.
This dual binding site system allows allosteric enzymes to finely tune their activity in response to cellular signals, ensuring that metabolic pathways are efficiently regulated based on the cell's needs.
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Allosteric Regulation
Allosteric regulation refers to the process by which an enzyme's activity is modulated by the binding of an effector molecule at a site other than the active site. This binding can induce conformational changes in the enzyme, enhancing or inhibiting its activity. Allosteric enzymes typically exhibit a sigmoidal kinetic response, reflecting their complex regulation.
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2:57
Allosteric Control Concept 1
Active Site vs. Allosteric Site
Allosteric enzymes possess two distinct types of binding sites: the active site, where substrate molecules bind to facilitate the enzymatic reaction, and the allosteric site, where regulatory molecules can bind. The interaction at the allosteric site can lead to changes in the enzyme's shape and function, allowing for fine-tuned control of metabolic pathways.
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2:57Allosteric Control Concept 1
Cooperativity
Cooperativity is a phenomenon observed in allosteric enzymes where the binding of a substrate to one active site affects the binding affinity of additional substrate molecules to other active sites. This can result in increased efficiency of substrate conversion as more substrate molecules bind, illustrating the enzyme's ability to respond dynamically to changes in substrate concentration.
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0:59Steroids Example 2
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One mechanism by which lead exerts its poisonous effect on enzymes can be stopped by chelation therapy with EDTA. Describe this type of lead poisoning and explain why it is reversible.
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What kind of inhibition (uncompetitive, competitive, or irreversible) is present in each of the following:
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What criteria make a compound a vitamin?
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