Ch.10 Proteins Workers of the Cell

Frost - General, Organic and Biological Chemistry 4th Edition

Frost4th EditionGeneral, Organic and Biological ChemistryISBN: 9780134988696Non è quello che usi tu?Cambia libro di testo

Frost 4th Edition

Ch.10 Proteins Workers of the Cell

Problema 99

Capitolo 6, Problema 99

How does an irreversible inhibitor function differently than a reversible inhibitor?

Guida verificata passo dopo passo

Irreversible inhibitors bind permanently to an enzyme, often through covalent bonds, leading to a permanent loss of enzyme activity.

Reversible inhibitors bind temporarily to an enzyme, usually through non-covalent interactions, and can be removed, allowing the enzyme to regain activity.

Irreversible inhibition often involves the inhibitor reacting with an amino acid residue at the active site of the enzyme, forming a stable complex.

Reversible inhibitors can be competitive, non-competitive, or uncompetitive, each affecting enzyme activity in different ways depending on their binding site and mechanism.

In the case of irreversible inhibitors, the enzyme's function is permanently altered, whereas reversible inhibitors allow for regulation of enzyme activity based on the concentration of the inhibitor.

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Irreversible Inhibitors

Irreversible inhibitors bind permanently to an enzyme, often through covalent bonds, leading to a permanent loss of enzymatic activity. This type of inhibition typically results in a decrease in the total number of active enzyme molecules available for catalysis, as the inhibitor modifies the enzyme's structure, rendering it inactive.

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Enzyme Inhibition Concept 2

Reversible Inhibitors

Reversible inhibitors bind to enzymes through non-covalent interactions, such as hydrogen bonds or ionic interactions, allowing them to dissociate from the enzyme. This means that the inhibition can be reversed, and the enzyme can regain its activity once the inhibitor is removed, making this type of inhibition more dynamic and dependent on the concentration of the inhibitor.

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Enzyme Inhibition Concept 2

Mechanisms of Inhibition

The mechanisms of inhibition refer to how inhibitors affect enzyme activity. Irreversible inhibitors typically cause permanent changes to the enzyme's active site, while reversible inhibitors can compete with substrates or bind to allosteric sites, altering the enzyme's function without permanently modifying its structure. Understanding these mechanisms is crucial for drug design and enzyme regulation.

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Enzyme Inhibition Concept 1

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Domanda del libro di testo

Insulin is a protein hormone that functions as two polypeptide chains whose amino acid sequences are as follows:

A chain: GIVEQCCTSICSLTQLENYCN

B chain: FVNQHLCGDHLVEALYLV CGERGFFYTPKT

b. Considering the amino acid sequences, suggest how these two polypeptide chains might be held together in an active insulin molecule.

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Domanda del libro di testo

Problems 10.94 and 10.95 both mention enzymes that hydrolyze peptide bonds. How do you account for the fact that pepsin has a high catalytic activity at pH 1.5 but chymotrypsin has very little activity at pH 1.5?

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Domanda del libro di testo

Pepsin, an enzyme that hydrolyzes peptide bonds in proteins, functions in the stomach at a pH optimum of 1.5 to 2.0. How is the rate of a pepsin-catalyzed reaction affected by each of the following conditions?

c. running the reaction at 0 °C

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Domanda del libro di testo

a. increasing the concentration of proteins

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Domanda del libro di testo

Meats spoil due to the action of enzymes that degrade the proteins. Fresh meats can be preserved for long periods of time by freezing them. Explain how freezing meats works to prevent spoilage.

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