Adenine is a purine with a variety of roles in biochemistry including cellular respiration, in the form of both the energy-rich adenosine triphosphate (ATP) and the cofactors nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD), and protein synthesis, as a chemical component of DNA and RNA. Structure It forms several tautomers, compounds that can be rapidly interconverted and are often considered equivalent. Biosynthesis The Purine metabolism involves the formation of… (More on Adenine)