Textbook Question
Consult the β-sheet in Figure 18.2 and (a) name the bonding responsible for the sheet formation and (b) identify the specific atoms responsible for this bonding.
Ch.18 Amino Acids and Proteins
McMurry8th EditionFundamentals of GOBISBN: 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
Chapter 18, Problem 30b
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.
Verified step by step guidance1
Step 1: Understand the definition of a conjugated protein. A conjugated protein is a protein that is combined with a non-protein component, called a prosthetic group, which is essential for its function.
Step 2: Identify the type of prosthetic group attached to the protein in the problem. In this case, the prosthetic group is ionized zinc.
Step 3: Recall the classification of conjugated proteins based on their prosthetic groups. Proteins with metal ions as their prosthetic group are classified as metalloproteins.
Step 4: Confirm that the protein described in the problem fits the definition of a metalloprotein. Since ionized zinc is a metal ion and is essential for the protein's function, this protein belongs to the metalloprotein class.
Step 5: Conclude that the protein described in the problem is a metalloprotein, as it contains ionized zinc as its prosthetic 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 metal ions, carbohydrates, or lipids, which are essential for the protein's biological function. Understanding the classification of conjugated proteins is crucial for identifying their roles in various biochemical processes.
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Metal Ions as Prosthetic Groups
Metal ions, such as zinc, can serve as prosthetic groups that are tightly bound to proteins, enabling them to perform specific functions. In the case of zinc, it often plays a critical role in enzyme activity, structural stability, and regulation of biological processes. Recognizing the importance of these metal ions helps in understanding how proteins interact with their environment and catalyze reactions.
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Classes of Conjugated Proteins
Conjugated proteins can be classified into several categories based on their prosthetic groups. For instance, metalloproteins contain metal ions, glycoproteins have carbohydrate moieties, and lipoproteins are associated with lipids. Identifying the class of a conjugated protein is essential for understanding its function and the biochemical pathways it participates in.
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Related Practice
Textbook Question
Complete the following two sentences with either globular or fibrous:
a. Proteins with secondary structure composed primarily of alpha-helix are___________ proteins.
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
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
c. Phosphate groups are attached to this protein.
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?
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