β-Nicotinamide Adenine Dinucleotide is a coeznyme consisting of an adenine base and a nicotinamide base connected by a pair of bridging phosphate group. β-Nicotinamide Adenine Dinucleotide acts as a coenzyme in redox reactions, as a donor of ADP-ribose moieties in ADP-ribosylation reactions and also as a precursor of the second messenger molecule cyclic ADP-ribose. β-Nicotinamide Adenine Dinucleotide also acts as a substrate for bacterial DNA ligases and a group of enzymes called sirtuins that use NAD+ to remove acetyl groups from proteins.
