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ADP-ribosyl Cyclase and CD38 Catalyze the Synthesis of a Calcium-mobilizing Metabolite from NADP+

Open access
Aarhus, Robert, Graeff, Richard M., Dickey, Deborah M., Walseth, Timothy F., Hon, Cheung Lee·1995·Journal of Biological Chemistry

Abstract

ADP-ribosyl cyclase catalyzes the cyclization of NAD+ to produce cyclic ADP-ribose (cADPR), which is emerging as an endogenous regulator of the Ca(2+)-induced Ca2+ release mechanism in cells. CD38 is a lymphocyte differentiation antigen which has recently been shown to be a bifunctional enzyme that can synthesize cADPR from NAD+ as well as hydrolyze cADPR to ADP-ribose. In this study, we show that both the cyclase and CD38 can also catalyze the exchange of the nicotinamide group of NADP+ with nicotine acid (NA). The product is nicotinic acid adenine dinucleotide phosphate (NAADP+), a metabolite we have previously shown to be potent in Ca2+ mobilization (Lee, H. C., and Aarhus, R. (1995) J. Biol. Chem. 270, 2152-2157). The switch of the catalysis to the exchange reaction requires acidic pH and NA. The half-maximal effective concentration of NA is about 5 mM for both the cyclase and CD38. In the absence of NA or at neutral pH, the cyclase converts NADP+ to another metabolite, which is identified as cyclic ADP-ribose 2'-phosphate. Under the same conditions, CD38 converts NADP+ to ADP-ribose 2'-phosphate instead, which is the hydrolysis product of cyclic ADP-ribose 2'-phosphate. That two different products of ADP-ribosyl cyclase and CD38, cADPR and NAADP+, are both involved in Ca2+ mobilization suggests a crucial role of these enzymes in Ca2+ signaling.

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Metadata

Authors
Aarhus, R., Graeff, R. M., Dickey, D. M., Walseth, T. F., & Hon, C. L.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1995-12
Volume
270
Issue
51
Pages
30327-30333
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2001695130
Cited by
416
References
24
FWCI
6.50
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: ADP-ribosyl Cyclase and CD38 Catalyze the Synthesis of a Calcium-mobilizing Metabolite from NADP+. https://app.cochat.ai/papers/10.1074/jbc.270.51.30327
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Aarhus, R., Graeff, R. M., Dickey, D. M., Walseth, T. F., & Hon, C. L. (1995). ADP-ribosyl Cyclase and CD38 Catalyze the Synthesis of a Calcium-mobilizing Metabolite from NADP+. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.270.51.30327

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