A unique EF-hand motif in mnemiopsin photoprotein from Mnemiopsis leidyi: Implication for its low calcium sensitivity

► The first cDNA of mnemiopsin, from Mnemiopsis leidyi. ► A unique EF-hand motif in which a conserved glycin is substituted with glutamate. ► The optimum pH 9.0, time course of regeneration is 15 h. ► Kinetic behaviors are confirmed by theoretical and modeling investigation.