Isoleucine (Ile, I) is one of the 22 amino acids present in proteins.
Structure of isoleucine
Like all of the amino acids, isoleucine has two functional groups: a carboxyl group (COOH) and an amine group (NH2). It has the following side chain: CH(CH3)CH2CH3, so it is a branched chain, non-polar, hydrophobic amino acid.
Function of isoleucine
Isoleucine is an essential amino acid which is therefore only obtained from the diet (eggs, meat, fish, cheese, etc.).
Isoleucine is an essential amino acid (carbon atom in black, oxygen in red, nitrogen in blue, and hydrogen in white). © Public domain