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How does an irreversible inhibitor function differently than a reversible inhibitor?
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Ch.10 Proteins Workers of the Cell
Frost4th EditionGeneral, Organic and Biological ChemistryISBN: 9780134988696
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TOC.tableOfContents
- Ch.4 Introduction to Organic Compounds75
- Ch.5 Chemical Reactions19
- Ch.6 Carbohydrates Life's Sweet Molecules62
- Ch.7 States of Matter and Their Attractive Forces8
- Ch.8 Solution Chemistry Sugar and Water Do Mix4
- Ch.10 Proteins Workers of the Cell89
- Ch.11 Nucleic Acids Big Molecules with a Big Role69
- Ch.12 Food as Fuel An Overview of Metabolism65
Frost4th EditionGeneral, Organic and Biological ChemistryISBN: 9780134988696Non è quello che usi tu?Cambia libro di testo
Capitolo 6, Problema 110b
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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Identify the types of interactions that can occur between amino acids in polypeptide chains. These include hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.
Examine the amino acid sequences of the A and B chains for cysteine (C) residues, as these can form disulfide bridges, which are covalent bonds that can link different parts of a protein or different polypeptide chains.
Note that the A chain contains cysteine residues at positions 6 and 20, and the B chain contains cysteine residues at positions 7 and 19.
Propose that disulfide bridges could form between cysteine residues in the A and B chains, specifically between A6 and B7, and A20 and B19, helping to stabilize the active insulin structure.
Consider other interactions such as hydrogen bonds and hydrophobic interactions that might also contribute to the overall stability and conformation of the insulin molecule.
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Protein Structure
Proteins are composed of amino acids linked by peptide bonds, forming polypeptide chains. The structure of a protein is crucial for its function, and it typically exists in four levels: primary (amino acid sequence), secondary (local folding patterns), tertiary (overall 3D shape), and quaternary (assembly of multiple polypeptide chains). In the case of insulin, understanding how the A and B chains interact is essential for grasping its functionality.
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3:26
Quaternary Protein Structure Concept 1
Disulfide Bonds
Disulfide bonds are covalent linkages formed between the sulfur atoms of cysteine residues in proteins. These bonds play a critical role in stabilizing the three-dimensional structure of proteins, particularly in secreted proteins like insulin. In insulin, disulfide bonds between the A and B chains help maintain its active conformation, ensuring proper biological activity.
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01:50Bond Energy
Protein Folding and Function
The process of protein folding is vital for the biological activity of proteins, as the specific shape of a protein determines its function. In insulin, the correct folding of the A and B chains, facilitated by interactions such as hydrogen bonds, hydrophobic interactions, and disulfide bonds, is necessary for its role in glucose regulation. Understanding how these chains come together provides insight into insulin's mechanism of action.
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02:16Logarithmic Functions
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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
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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