Chemistry for Today: General, Organic, and Biochemistry
Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN: 9781305960060
Author: Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher: Cengage Learning
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Chapter 19, Problem 19.42E
Interpretation Introduction

(a)

Interpretation:

The type of interaction present between the side chains of tyrosine and glutamine is to be stated.

Concept introduction:

The structure of proteins has four stages. These four stages are: primary, secondary, tertiary and quaternary structures. In primary structure, the amino acids are arranged to give the backbone of protein. In secondary structure, the pattern of the peptide chain is arranged in certain order. In tertiary structure, the interactions between the side chains of amino acids are considered. In quaternary structure, two or more peptide chains are linked.

Expert Solution
Check Mark

Answer to Problem 19.42E

The type of interaction present between the side chains of tyrosine and glutamine is hydrogen bonding.

Explanation of Solution

The structures of tyrosine and glutamine are shown in Figure 1.

Chemistry for Today: General, Organic, and Biochemistry, Chapter 19, Problem 19.42E , additional homework tip  1

Figure 1

In tyrosine, the side chain has CH2C6H4OH group and glutamine has (CH2)2CONH2 group. The type of interaction that is possible between the side chains of the two amino acids is hydrogen bonding. This is because both nitrogen and oxygen are electronegative atoms and are linked with hydrogen atoms.

Therefore, the type of interaction present between the side chains of tyrosine and glutamine is hydrogen bonding.

Conclusion

The type of interaction present between the side chains of tyrosine and glutamine is hydrogen bonding.

Interpretation Introduction

(b)

Interpretation:

The type of interaction present between the side chains of aspartate and lysine is to be stated.

Concept introduction:

The structure of proteins has four stages. These four stages are: primary, secondary, tertiary and quaternary structures. In primary structure, the amino acids are arranged to give the backbone of protein. In secondary structure, the pattern of the peptide chain is arranged in certain order. In tertiary structure, the interactions between the side chains of amino acids are considered. In quaternary structure, two or more peptide chains are linked.

Expert Solution
Check Mark

Answer to Problem 19.42E

The type of interaction present between the side chains of aspartate and lysine is salt bridge.

Explanation of Solution

The structures of aspartate and lysine are shown in Figure 2.

Chemistry for Today: General, Organic, and Biochemistry, Chapter 19, Problem 19.42E , additional homework tip  2

Figure 2

In aspartate, the side chain has CH2COO group and lysine has (CH2)4NH3+ group. The type of interaction that is possible between the side chains of the two amino acids is ionic bonding which results in the formation of salt bridge. This is because the ionized side chains are present in both the amino acids. Therefore, the type of interaction present between the side chains of aspartate and lysine is salt bridge.

Conclusion

The type of interaction present between the side chains of aspartate and lysine is salt bridge.

Interpretation Introduction

(c)

Interpretation:

The type of interaction present between the side chains of leucine and isoleucine is to be stated.

Concept introduction:

The structure of proteins has four stages. These four stages are: primary, secondary, tertiary and quaternary structures. In primary structure, the amino acids are arranged to give the backbone of protein. In secondary structure, the pattern of the peptide chain is arranged in certain order. In tertiary structure, the interactions between the side chains of amino acids are considered. In quaternary structure, two or more peptide chains are linked.

Expert Solution
Check Mark

Answer to Problem 19.42E

The type of interaction present between the side chains of leucine and isoleucine is hydrophobic interaction.

Explanation of Solution

The structures of leucine and isoleucine are shown in Figure 3.

Chemistry for Today: General, Organic, and Biochemistry, Chapter 19, Problem 19.42E , additional homework tip  3

Figure 3

In leucine, the side chain has CH2CH(CH3)2 group and isoleucine has CH(CH3)CH2CH3 group. The type of interaction that is possible between the side chains of the two amino acids is hydrophobic. This is because the hydrophobic alkyl chains are present in both the amino acids. Therefore, the type of interaction present between the side chains of leucine and isoleucine is hydrophobic interaction.

Conclusion

The type of interaction present between the side chains of leucine and isoleucine is hydrophobic interaction.

Interpretation Introduction

(d)

Interpretation:

The type of interaction present between the side chains of phenylalanine and valine is to be stated.

Concept introduction:

The structure of proteins has four stages. These four stages are: primary, secondary, tertiary and quaternary structures. In primary structure, the amino acids are arranged to give the backbone of protein. In secondary structure, the pattern of the peptide chain is arranged in certain order. In tertiary structure, the interactions between the side chains of amino acids are considered. In quaternary structure, two or more peptide chains are linked.

Expert Solution
Check Mark

Answer to Problem 19.42E

The type of interaction present between the side chains of phenylalanine and valine is hydrophobic interaction.

Explanation of Solution

The structures of phenylalanine and valine are shown in Figure 4.

Chemistry for Today: General, Organic, and Biochemistry, Chapter 19, Problem 19.42E , additional homework tip  4

Figure 4

In phenylalanine, the side chain has CH2C6H5 group and valine has CH(CH3)2 group. The type of interaction that is possible between the side chains of the two amino acids is hydrophobic. This is because the hydrophobic alkyl chains are present in both the amino acids. Therefore, the type of interaction present between the side chains of phenylalanine and valine is hydrophobic interaction.

Conclusion

The type of interaction present between the side chains of phenylalanine and valine is hydrophobic interaction.

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Chapter 19 Solutions

Chemistry for Today: General, Organic, and Biochemistry

Ch. 19 - Prob. 19.11ECh. 19 - Write structural formulas to show the form the...Ch. 19 - Write structural formulas to show the form of the...Ch. 19 - Write ionic equations to show how serine acts as a...Ch. 19 - Write two reactions to represent the formation of...Ch. 19 - Write a complete structural formula and an...Ch. 19 - Write a complete structural formula and an...Ch. 19 - Prob. 19.18ECh. 19 - Write abbreviated formulas for the six isomeric...Ch. 19 - Prob. 19.20ECh. 19 - How many tripeptide isomers that contain one...Ch. 19 - What special role does the amino acid cysteine...Ch. 19 - Prob. 19.23ECh. 19 - Explain why the presence of certain proteins in...Ch. 19 - Prob. 19.25ECh. 19 - Explain why a protein is least soluble in an...Ch. 19 - Prob. 19.27ECh. 19 - Prob. 19.28ECh. 19 - Classify each of the following proteins into one...Ch. 19 - For each of the following two proteins listed in...Ch. 19 - Prob. 19.31ECh. 19 - Differentiate between simple and conjugate...Ch. 19 - Give one example of a conjugated protein that...Ch. 19 - Prob. 19.34ECh. 19 - Prob. 19.35ECh. 19 - Write the structure for a protein backbone. Make...Ch. 19 - Prob. 19.37ECh. 19 - Prob. 19.38ECh. 19 - Prob. 19.39ECh. 19 - Prob. 19.40ECh. 19 - Which amino acids have side-chain groups that can...Ch. 19 - Prob. 19.42ECh. 19 - Prob. 19.43ECh. 19 - A globular protein in aqueous surroundings...Ch. 19 - What is meant by the term quaternary protein...Ch. 19 - What types of forces give rise to quaternary...Ch. 19 - Describe the quaternary protein structure of...Ch. 19 - Prob. 19.48ECh. 19 - Prob. 19.49ECh. 19 - Prob. 19.50ECh. 19 - As fish is cooked, the tissue changes from a soft...Ch. 19 - Prob. 19.52ECh. 19 - Prob. 19.53ECh. 19 - Once cooked, egg whites remain in a solid form....Ch. 19 - Prob. 19.55ECh. 19 - Prob. 19.56ECh. 19 - A protein has a molecular weight of about 12,000u....Ch. 19 - Which amino acids could be referred to as...Ch. 19 - Prob. 19.59ECh. 19 - Prob. 19.60ECh. 19 - Prob. 19.61ECh. 19 - Some researchers feel that the high experienced by...Ch. 19 - Prob. 19.63ECh. 19 - Prob. 19.64ECh. 19 - Prob. 19.65ECh. 19 - Prob. 19.66ECh. 19 - Why must the protein drug insulin be given by...Ch. 19 - Prob. 19.68ECh. 19 - Prob. 19.69ECh. 19 - Prob. 19.70ECh. 19 - Prob. 19.71ECh. 19 - What functional groups are found in all amino...Ch. 19 - Which of the following are true concerning the...Ch. 19 - Rank the following components of hemoglobin in...Ch. 19 - Describe the quaternary protein structure of...Ch. 19 - Complete degradation of a protein into individual...Ch. 19 - Which is NOT a characteristic of proteins? a. They...Ch. 19 - Which of the following describes the primary...
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