EBK BIOCHEMISTRY
EBK BIOCHEMISTRY
8th Edition
ISBN: 9781319116361
Author: BERG
Publisher: W.H. Freeman & Company
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Chapter 2, Problem 1P
Interpretation Introduction

Interpretation:

The names, three-letter abbreviations and one-letter abbreviations for the given structure of amino acids are needed to be determined.

Concept introduction:

Amino acids are organic compounds containing amino as well as a carboxylic group. The general molecular formula of an amino acid is as follows:

  H2N-CH(R)COOH

Here, R refers to different groups for different amino acids. If there is more than one amino group present in amino acid, it is considered as basic amino acid and if there is more than one carboxylic group present, then it is considered as an acidic amino acid.

Expert Solution & Answer
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Answer to Problem 1P

A: Proline, the three-letter abbreviation is Pro and a one-letter abbreviation is P.

B: Tyrosine, the three-letter abbreviation is Tyr and a one-letter abbreviation is Y.

C: Leucine, the three-letter abbreviation is Leu and a one-letter abbreviation is L.

D: Lysine, the three-letter abbreviation is Lys and a one-letter abbreviation is K.

Explanation of Solution

The given structure of amino acids (A-D) are:

  EBK BIOCHEMISTRY, Chapter 2, Problem 1P

The amino acid in structure A is proline. It is one of the a-amino acids that is used by living organisms as the building blocks of the proteins. Its three-letter abbreviation is Pro, and one letter abbreviation is P.

Structure B represents a non-essential amino acid, tyrosine. In animals, it is synthesized from phenylalanine. It is also the precursor of epinephrine, thyroid hormones and melanin. Its three-letter abbreviation is Tyr, and one letter abbreviation is Y.

The structure C represents the amino acid Leucine which is obtained from the hydrolysis of most common proteins. It was discovered in 1819in muscle fiber and wool. Its three-letter abbreviation is Leu and the one-letter abbreviation is L.

The structure D represents the amino acid Lysine which is an essential amino acid for the nutrition of humans. Its three-letter abbreviation is Lys, and one letter abbreviation is K.

Conclusion

A: Proline, the three-letter abbreviation is Pro and a one-letter abbreviation is P.

B: Tyrosine, the three-letter abbreviation is Tyr and a one-letter abbreviation is Y.

C: Leucine, the three-letter abbreviation is Leu and a one-letter abbreviation is L.

D: Lysine, the three-letter abbreviation is Lys and a one-letter abbreviation is K.

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Give typing answer with explanation and conclusion On paper draw a dipeptide, clearly showing the peptide bond joining the two amino acids together. If the two amino acids are valine and threonine, predict the overall charge of the dipeptide at pH 7. Do not forget to consider the amino (N-terminal) and carboxy (C-terminal) of the dipeptide, as well as the R groups. Select one: a. +2 b. -2 c. 0 d. -1 e. +1
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