Question

How many different tripeptides can be formed from three different amino acids?

Short answer

Two different tripeptides can be formed from three different amino acids.

Step-by-step solution

Tripeptides

The three peptide bonds that are derived from the three amino acids are called tripeptides. A few examples oftripeptides are glutathione, Eisenin, GHK-Cu, etc.

Amino acids

The building blocks responsible for the formation of proteins are called amino acids.The only residue that remains in the body after the digestion of food is amino acids.

Structures of different tripeptides

The conformation of the first tripeptide is s-trans.In this conformation, the C-N bond has two carbon atoms that are oriented on the opposite side. The structure is given below.

Structure of s-trans

The conformation of the second tripeptide is s-cis.In this conformation, the C-N bond has two carbon atoms that are oriented on the same side. The structure is given below.

Structure of s-cis

The two structures differ only by the orientation of the two carbon atoms along with the C-N bond.