Textbook Question
Both α-keratin and tropocollagen have helical secondary structure. How do these molecules differ in (a) amino acid composition and (b) three-dimensional structure?
Ch.18 Amino Acids and Proteins
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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Table of contents
- 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: 9780134015187Not the one you use?Change textbook
Chapter 18, Problem 30c
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
c. Phosphate groups are attached to this protein.
Verified step by step guidance1
Understand the concept of conjugated proteins: Conjugated proteins are proteins that consist of a protein part (called the apoprotein) and a non-protein component (called the prosthetic group). The classification of conjugated proteins depends on the type of prosthetic group attached.
Identify the prosthetic group in the given problem: The problem states that phosphate groups are attached to the protein. This indicates that the prosthetic group is a phosphate group.
Recall the class of conjugated proteins associated with phosphate groups: Proteins with phosphate groups as their prosthetic group are classified as phosphoproteins.
Relate the information to the classification: Since the protein described in the problem has phosphate groups attached, it belongs to the class of phosphoproteins.
Conclude the classification: Based on the analysis, the protein described is a phosphoprotein, as its prosthetic group is a phosphate group.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Conjugated Proteins
Conjugated proteins are complex molecules formed by the combination of a protein with a non-protein component, known as a prosthetic group. These non-protein components can include carbohydrates, lipids, or inorganic molecules, which contribute to the protein's function and properties. Understanding the classification of conjugated proteins is essential for identifying their roles in biological systems.
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Digestion of Proteins Concept 1
Phosphorylation
Phosphorylation is a biochemical process involving the addition of phosphate groups to a protein, which can alter the protein's function, activity, or localization. This modification is crucial in regulating various cellular processes, including signal transduction and metabolic pathways. Proteins that undergo phosphorylation are often classified as phosphoproteins, a specific type of conjugated protein.
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Classes of Conjugated Proteins
Conjugated proteins can be classified into several categories based on their prosthetic groups. Common classes include glycoproteins (with carbohydrate groups), lipoproteins (with lipid components), and metalloproteins (with metal ions). Identifying the class of a conjugated protein, such as one modified by phosphate groups, helps in understanding its biological function and interactions within the cell.
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Related Practice
Textbook Question
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
a. Cholesterol is attached to this protein in order to move through the blood system.
Textbook Question
Another endoprotease is trypsin. Trypsin hydrolyzes peptide bonds on the carboxyl side of lysine and arginine. If the following peptide sequence is hydrolyzed by trypsin, how many fragments will there be? Use the three-letter amino acid abbreviations to write the fragments out.
Ala-Phe-Lys-Cys-Gly-Asp-Arg-Leu-Leu-Phe-Gly-Ala
Textbook Question
If the same peptide found in Problem 18.32 is subjected to acid hydrolysis, how many fragments will result? Why?
Ala-Phe-Lys-Cys-Gly-Asp-Arg-Leu-Leu-Phe-Gly-Ala
Textbook Question
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
b. Ionized zinc is attached to this protein so the protein can function.
Textbook Question
Complete the following two sentences with either globular or fibrous:
a. Proteins with secondary structure composed primarily of alpha-helix are___________ proteins.