Question

Give the structural formulas of two different dipeptides formed between leucine and lysine.

Short answer

Question: Provide the structural formulas of the two different dipeptides formed between leucine and lysine. Answer: 1. Leucine-Lysine: H2N-(CH2)2-CH(CH3)2-C(=O)NH-(CH2)4-NH2-NH2 2. Lysine-Leucine: H2N-(CH2)4-NH2-C(=O)NH-(CH2)2-CH(CH3)2-COOH

Step-by-step solution

Understand the structure of leucine and lysine

Leucine and lysine are amino acids with the following structures: Leucine - HOOC-(CH2)2-CH(CH3)2-NH2 Lysine - HOOC-(CH2)4-NH2-NH2 Both leucine and lysine have an amino (-NH2) group and a carboxyl (-COOH) group. These groups will form a peptide bond when condensation occurs.

Form the first dipeptide

The first dipeptide is formed when the amino group of one leucine molecule reacts with the carboxyl group of one lysine molecule. The peptide bond is formed by the elimination of a water molecule. The resulting dipeptide structure can be represented as: Leucine-Lysine: H2N-(CH2)2-CH(CH3)2-C(=O)NH-(CH2)4-NH2-NH2

Form the second dipeptide

The second dipeptide is formed when the amino group of one lysine molecule reacts with the carboxyl group of one leucine molecule. The peptide bond is formed by the elimination of a water molecule. The resulting dipeptide structure can be represented as: Lysine-Leucine: H2N-(CH2)4-NH2-C(=O)NH-(CH2)2-CH(CH3)2-COOH

Identify the two different dipeptides

Based on the combination of leucine and lysine, we have found two different dipeptides. 1. Leucine-Lysine: H2N-(CH2)2-CH(CH3)2-C(=O)NH-(CH2)4-NH2-NH2 2. Lysine-Leucine: H2N-(CH2)4-NH2-C(=O)NH-(CH2)2-CH(CH3)2-COOH These two dipeptides are the possible combinations of leucine and lysine and have distinct structural formulas.