Hexon bases
The three basic amino acids lysine , arginine and histidine are called hexon bases . The six carbon atoms in the molecule give it its name. As protein components, all hexone bases are in the L configuration. According to the CIP nomenclature, the proteinogenic amino acids lysine, arginine and histidine each have an ( S ) configuration. The hexone bases all have a primary amino group on the α-carbon atom, directly next to the carboxy group , as well as an additional basic functional group. In lysine this is a second amino group, in arginine a guanidinyl residue and in histidine an imidazolyl residue.
The chemist Albrecht Kossel received the Nobel Prize for Medicine in 1910 , primarily for his work with these amino acids .
Structure of L- lysine
Structure of L- arginine
Structure of L- histidine
