May form part of a signal transduction pathway, transducing the signal from diacylglycerol to effector functions (PubMed:2062851). One such function could be the release of neurotransmitter from neurons (PubMed:2062851). Probably by regulating neuronal transmission downstream of lin-3 and receptor lin-23 and phospholipase plc-3 and upstream of innexin unc-7 and egl-4/PKG in ALA neurons, involved in the decrease in pharyngeal pumping during the quiescent state that precedes each larval molt, (PubMed:17891142). Interacts with cmd-1 in the presence of Ca(2+). The phorbol ester binding activity is zinc and calcium-dependent. Worms exhibit diverse nervous system defects. Belongs to the unc-13 family.