ε-NAADP⁺

ε-NAADP⁺ is a fluorescent analogue of the Ca²⁺-mobilizing agent nicotinic acid adenine dinucleotide phosphate (β-NAADP, Prod. No. BLG-N018) in which both the N¹ and the N⁶ nitrogen atoms in the adenine nucleobase are connected by an etheno bridge forming a tricyclic ring system.
ε-NAADP is a fluorescent analogue of the Ca²⁺-releasing messenger β-NAADP with λ_exc 275 nm and λ_em 410 nm. ε-NAADP activates Ca²⁺ release from sea urchin egg homogenates with a half-maximal effective concentration of 5 µM (Lee & Aarhus 1998).