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Chapter 25: Problem 20

Draw the structures of the dipeptides that can be formed from the reaction between the amino acids glycine and lysine.

Short Answer

Expert verified
The two possible dipeptides that can be formed from glycine and lysine are glycyllysine and lysylglycine.

Step by step solution

01

Identify the Amino Acids

Identify the structure of the two involved amino acids: glycine and lysine. Glycine has a hydrogen as its side chain whereas lysine has an extended carbon chain ending with an amine group.
02

Peptide Bond Formation 1 - Glycine with Lysine

For the first dipeptide, the carboxyl group of glycine (-COOH) reacts with the amino group of lysine (-NH2) to form a peptide bond. The product is glycyllysine, written as glycine-lysine.
03

Peptide Bond Formation 2 - Lysine with Glycine

For the second dipeptide, the carboxyl group of lysine reacts with the amino group of glycine to form a peptide bond. The product is lysylglycine, written as lysine-glycine.
04

Draw the Dipeptides

Draw the structures of the formed dipeptides. Glycyllysine has the side chain of lysine attached to the carboxyl end of glycine. Lysylglycine has the hydrogens of the glycine's side chain attached to the carboxyl end of lysine.

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