Aliphatic Amino Acids Isoleucine (ILE) (a - amino b - methyl-valerate) NH3 + C COO￾H CH CH3 CH2 CH3 CH2Aliphatic Amino Acids Isoleucine (ILE) (a - amino b - methyl-valerate) NH3 + C COO￾H CH CH3 CH2 CH3 CH2