Figure 1
From: DSD – An integrated, web-accessible database of Dehydrogenase Enzyme Stereospecificities
The structures of pyridine nucleotide coenzymes, NAD and NADP. The nicotinamide rings which are pivotal to the hydride transfer, are highlighted. The rings are bound to ribose, which with respect to NAD, is linked to another ribose sugar and adenine through two phosphate groups. With regard to NADP, the ribose and nicotinamide ring are bound by two phosphate groups to adenosine monophosphate.