2.4.99.20 | NADP+ + nicotinate = nicotinate-adenine dinucleotide phosphate + nicotinamide |
overall reaction. The multifunctional 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 nicotinic acid-adenine dinucleotide phosphate, a calcium messenger that can mobilize intracellular Ca2+ stores and activate Ca2+ influx to regulate a wide range of physiological processes |
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