Question

Draw the complete structures of the following peptides:

(a) Thr-Phe-Met (b) Serylarginylglycylphenylalanine (c) IMQDK (d) ELVIS

Short answer

(a)

Structure of the peptide Thr-Phe-Met

(b)

Structure of the peptide seryl-arginyl-glycyl-phenylalanine

(c)

Structure of the peptide IMQDK

(d)

Structure of the peptide ELVIS

Step-by-step solution

Peptide bond formation

The amides obtained by the interaction between the amino and carboxylic groups of two or more amino acid molecules are known as peptides. The amide group $\mathbf{-}\mathbf{CO}\mathbf{-}\mathbf{NH}\mathbf{-}$ in the peptides is known as a peptide linkage.

Structures of the peptide

(a)

The complete structure of the peptide Thr-Phe-Met is shown in the figure below:

Structure of the peptide Thr-Phe-Met

(b)

The complete structure of the peptide seryl-arginyl-glycyl-phenylalanine is shown in the figure below:

Structure of the peptide seryl-arginyl-glycyl-phenylalanine

(c)

The complete structure of the peptide IMQDK (isoleucine-methionine-glutamine-aspartate-lysine) is shown in the figure below:

Structure of the peptide IMQDK

(d)

The complete structure of the peptide ELVIS (glutamic acid-leucine-valine-isoleucine-serine) is shown in the figure below:

Structure of the peptide ELVIS