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Immobilized Pig Brain NAD Glycohydrolase for the Preparation of NAD Analogues

Among the enzymes whose activities are affected by pyridine nucleotides, the dehydrogenases are widely studied under the biochemical and physiological point of view. Their technological importance is based on the development of methods for clinical analyses as well as on the preparation of particular biosensors. In addition to dehydrogenases, other enzymes related to NAD and NADP play an important role in reactions where the pyridine nucleotides work as substrates instead of coenzymes. Some of these reactions are connected with pathological infections, such as bacteria toxins, whereas other enzymes, named NADases or NAD glycohydrolases, catalyze reactions normally occurring in fungi, mammalian seminal plasma, mammalian organs, and other tissues, leading to the breaking of the nicotinamide N-ribosidic bond in NAD(P). The enzymes from bacteria, fungi, and mammalian seminal plasma (EC 3.2.2.5) show a pure hydrolytic activity'-5 and yield nicotinamide and adenosine diphosphate ribose (ADPR) according to the following reaction: