Reaction: NADP+ + nicotinate = nicotinate-adenine dinucleotide phosphate + nicotinamide (overall reaction)
(1a) NADP+ = 2'-phospho-cyclic ADP-ribose + nicotinamide
(1b) 2'-phospho-cyclic ADP-ribose + nicotinate = nicotinate-adenine dinucleotide phosphate
For diagram of reaction click here.
Glossary: 2'-phospho-cyclic ADP-ribose = cADPRP
nicotinic acid-adenine dinucleotide phosphate = NAADP+
Other name(s): diphosphopyridine nucleosidase (ambiguous); CD38 (gene name); BST1 (gene name)
Systematic name: NADP+:nicotinate ADP-ribosyltransferase
Comments: This multiunctional enzyme catalyses both the removal of nicotinamide from NADP+, forming 2'-phospho-cyclic ADP-ribose, and the addition of nicotinate to the cyclic product, forming NAADP+, a calcium messenger that can mobilize intracellular Ca2+ stores and activate Ca2+ influx to regulate a wide range of physiological processes. In addition, the enzyme also catalyses EC 22.214.171.124, ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
1. Chini, E.N., Chini, C.C., Kato, I., Takasawa, S. and Okamoto, H. CD38 is the major enzyme responsible for synthesis of nicotinic acid-adenine dinucleotide phosphate in mammalian tissues. Biochem. J. 362 (2002) 125-130. [PMID: 11829748]
2. Moreschi, I., Bruzzone, S., Melone, L., De Flora, A. and Zocchi, E. NAADP+ synthesis from cADPRP and nicotinic acid by ADP-ribosyl cyclases. Biochem. Biophys. Res. Commun. 345 (2006) 573-580. [PMID: 16690024]