Chapter 27, Problem 27.1P

Interpretation Introduction

(a)

Interpretation:

The structure of tryptophylglycylisoleucylaspartic acid is to be predicted.

Concept introduction:

The chemical compounds in which carbon is bonded with the acidic and basic group along with hydrocarbon side chain are known as amino acids. The amino acids are classified into acidic, basic, polar, non-polar, essential, and non-essential categories. The three-word abbreviation or one-word abbreviation is used for amino acids.

Answer to Problem 27.1P

The structure of tryptophylglycylisoleucylaspartic acid is shown below.

Explanation of Solution

The name of the peptide is triptophylglycylisoleucylaspartic acid.

This peptide is made up of four amino acids which are linked by peptide bonds. The amino acids are tryptophan, glycine, isoleucine, and aspartic acid.

The structures of triptophane, glycine, isoleucine, and aspartic acid are shown below.

Figure 1

Therefore, the structure of tryptophylglycylisoleucylaspartic acid is shown below.

Figure 2

Conclusion

The structure of tryptophylglycylisoleucylaspartic acid is shown in Figure 2.

Interpretation Introduction

(b)

Interpretation:

The structure of $\text{Glu-Gln-Phe-Arg}$ is to be predicted.

Concept introduction:

The chemical compounds in which carbon is bonded with the acidic and basic group along with hydrocarbon side chain are known as amino acids. The amino acids are classified into acidic, basic, polar, non-polar, essential, and non-essential categories. The three-word abbreviation or one-word abbreviation is used for amino acids.

Answer to Problem 27.1P

The structure of $\text{Glu-Gln-Phe-Arg}$ is shown below.

Explanation of Solution

The name of the peptide is $\text{Glu-Gln-Phe-Arg}$.

This peptide is made up of four amino acids which are linked by peptide bonds. The amino acids are glutamic acid, glutamine, phenylalanine, and arginine.

The structures of glutamic acid, glutamine, phenylalanine, and arginine are shown below.

Figure 3

Therefore, the structure of $\text{Glu-Gln-Phe-Arg}$ is shown below.

Figure 4

Conclusion

The structure of $\text{Glu-Gln-Phe-Arg}$ is shown in Figure 4.