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ECB-ART-43910
J Med Chem 2015 Apr 23;588:3593-610. doi: 10.1021/acs.jmedchem.5b00279.
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Nicotinic Acid Adenine Dinucleotide Phosphate Analogues Substituted on the Nicotinic Acid and Adenine Ribosides. Effects on ReceptorMediated Ca²⁺ Release.

Trabbic CJ , Zhang F , Walseth TF , Slama JT .


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Nicotinic acid adenine dinucleotide phosphate (NAADP) is a Ca(2+) releasing intracellular second messenger in both mammals and echinoderms. We report that large functionalized substituents introduced at the nicotinic acid 5-position are recognized by the sea urchin receptor, albeit with a 20-500-fold loss in agonist potency. 5-(3-Azidopropyl)-NAADP was shown to release Ca(2+) with an EC50 of 31 μM and to compete with NAADP for receptor binding with an IC50 of 56 nM. Attachment of charged groups to the nicotinic acid of NAADP is associated with loss of activity, suggesting that the nicotinate riboside moiety is recognized as a neutral zwitterion. Substituents (Br- and N3-) can be introduced at the 8-adenosyl position of NAADP while preserving high potency and agonist efficacy and an NAADP derivative substituted at both the 5-position of the nicotinic acid and at the 8-adenosyl position was also recognized although the agonist potency was significantly reduced.

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Genes referenced: LOC100887844 LOC115925415 LOC576539

References [+] :
Aarhus, ADP-ribosyl cyclase and CD38 catalyze the synthesis of a calcium-mobilizing metabolite from NADP. 1995, Pubmed