Enables diacylglycerol binding activity. Involved in several processes, including positive regulation of glutamate receptor signaling pathway; positive regulation of synaptic plasticity; and synaptic vesicle exocytosis. Acts upstream of or within several processes, including amyloid-beta metabolic process; chemical synaptic transmission; and modulation of chemical synaptic transmission. Located in calyx of Held and neuromuscular junction. Is active in glutamatergic synapse and presynaptic active zone. Is expressed in nervous system and neural retina. Human ortholog(s) of this gene implicated in amyotrophic lateral sclerosis. Orthologous to human UNC13A (unc-13 homolog A). [provided by Alliance of Genome Resources, Apr 2022]