Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

18. Amino Acids and Proteins

Peptides

GOB Chemistry

18. Amino Acids and Proteins

Peptides

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4:38 minutes

Problem 16b

Textbook Question

Consider the following tripeptide:

b. Give the one-letter and three-letter abbreviations of this tripeptide.

Verified step by step guidance

Identify the amino acids present in the tripeptide by analyzing the structure provided in the image. Look for the side chains and backbone structure to determine the specific amino acids.

Determine the three-letter abbreviations for each amino acid based on their chemical structure. Common examples include Gly for glycine, Ala for alanine, and Phe for phenylalanine.

Combine the three-letter abbreviations in the order they appear in the tripeptide sequence to represent the full tripeptide using three-letter codes.

Determine the one-letter abbreviations for each amino acid using the standard amino acid one-letter code chart. For example, Gly is G, Ala is A, and Phe is F.

Combine the one-letter abbreviations in the order they appear in the tripeptide sequence to represent the full tripeptide using one-letter codes.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Amino Acids

Amino acids are the building blocks of proteins, consisting of a central carbon atom, an amino group, a carboxyl group, a hydrogen atom, and a variable R group. Each amino acid has a unique side chain that determines its properties and role in protein structure. In a tripeptide, three amino acids are linked together by peptide bonds, forming a specific sequence that influences the peptide's function.

Peptide Bonds

Peptide bonds are covalent bonds that link amino acids together in a protein or peptide chain. They form through a dehydration synthesis reaction, where the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water. Understanding peptide bonds is crucial for analyzing the structure and function of peptides, including tripeptides.

Abbreviations of Amino Acids

Amino acids are commonly represented by one-letter and three-letter abbreviations, which are standardized for ease of communication in biochemistry. For example, alanine is abbreviated as 'A' (one-letter) and 'Ala' (three-letter). Knowing these abbreviations is essential for identifying and discussing peptides and proteins succinctly, especially in scientific literature.

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Textbook Question

Peptides from sweet potato with antioxidant properties have the following sequence of amino acids. Draw the structure for each peptide and write the one-letter abbreviations.

b. Asn–Tyr–Asp–Glu–Tyr

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