ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase

UniProtKB accession:  P29241

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UniProtKB description:  Synthesizes cyclic ADP-ribose (cADPR), a second messenger for calcium mobilization from endoplasmic reticulum; ADP-ribose is a minor product (PubMed:1650254, PubMed:10861229). Synthesizes the Ca(2+) mobilizer nicotinate-adenine dinucleotide phosphate from 2'-phospho-cADPR and nicotinic acid as well as from NADP(+) and nicotinic acid; with NADP(+) as substrate preferentially catalyzes NADP(+) hydrolysis rather than NAADP(+) synthesis, about 70-fold better at pH 7.4 (PubMed:11829748, PubMed:16690024). Has cADPR hydrolase activity at very high enzyme concentrations, which is probably not physiological (PubMed:10861229). The conversion of NAD(+) into ADP-ribose is also only observed at high enzyme concentrations and results from the hydrolysis of cADP-ribose (PubMed:10861229).