Question

An opioid pentapeptide has the following structure: Tyr-Cys-Gly-Phe-Cys

a. Draw the structure of the pentapeptide including all the side chains.

b. Write its structure following mild oxidation.

Short answer

The answer is:

a.

Structure of pentapeptide

b.

Structure of pentapeptide on oxidation

Step-by-step solution

Step-by-Step Solution Step 1: Peptide

The peptide can be defined as smaller protein chains or amino acid chains. The amino acids in peptide chains are interconnected using the peptide bonds. The peptides with five amino acids are called pentapeptides.

Subpart (a)

The structure of pentapeptide is shown below.

Structure of (a)

Subpart (b)

The structure of pentapeptide following mild oxidation is shown below.

Structure of oxidized pentapeptide