Concept explainers
Interpretation:
Amino acid sequences possible for the tripeptide containing cys, ala and phe must be written using all the amino acids once in each tripeptide.
Concept Introduction:
Peptide bonds are formed by water removal from two amino acids. COOH group of one amino acid reacts with NH2 group of another amino acid.
Answer to Problem 8A
Possible tripeptide sequences are given below.
Cys-ala-phe, phe-ala-cis, ala-phe-cys. Cys-phe-ala, phe-cys-ala, ala-cys-phe.
Explanation of Solution
6 possible tripeptide sequences were obtained by changing the arrangement of amino acids. Each amino acid can be N-terminal or C-terminal. N-terminal amino acid means its acid group is reacted with
Thus, possible tripeptide sequences are given below.
Cys-ala-phe, phe-ala-cis, ala-phe-cys. Cys-phe-ala, phe-cys-ala, ala-cys-phe.
Chapter 21 Solutions
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