Drawing and Naming a Peptide

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Q1. Draw the structure and give the name for the tripeptide Gly–Ser–Met.

Q2. Draw the structure and give the name for Phe–Thr, a section in glucagon, which is a peptide hormone that increases blood glucose levels.

Step 1 Draw the structures for each amino acid in the peptide, starting with the N-terminus.

Step 2 Remove the O atom from the carboxylate group of the N-terminus and two H atoms from the ammonium group in the adjacent amino acid. Repeat this process until the C-terminus is reached.

Step 3 Use peptide bonds to connect the amino acid residues.

The tripeptide is named by replacing the last syllable of each amino acid name with yl, starting with theN-terminus. The C-terminus retains its complete amino acid name.

N-terminus glycine is named glycyl
serine is named seryl
C-terminus methionine keeps its full name

The tripeptide is named glycylserylmethionine.

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