Adenine

Adenine /ˈædnn/ (A, Ade) is a nucleobase (a purine derivative). Its derivatives have a variety of roles in biochemistry includingcellular respiration, in the form of both the energy-rich adenosine triphosphate (ATP) and the cofactors nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD). It also has functions in protein synthesis and as a chemical component ofDNA and RNA.[2] The shape of adenine is complementary to either thymine in DNA or uracil in RNA.

The image right shows pure adenine, as an independent molecule. When connected into DNA, a covalent bond is formed betweendeoxyribose sugar and the bottom left nitrogen, so removing the hydrogen. The remaining structure is called an adenine residue, as part of a larger molecule. Adenosine is adenine reacted with ribose as used in RNA and ATP; deoxyadenosine adenine attached todeoxyribose, as is used to form DNA.

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