Required for the conversion of tyramine to octopamine, a precursor of octapamine but probably itself a neurotransmitter (PubMed:15848803). Involved in the regulation of egg laying, which is inhibited by tyramine (PubMed:15848803). Due to its involvement in octopamine biosynthesis, also required for crtc-1-dependent regulation of AMPK-mediated longevity (PubMed:25723162). Binds 2 copper ions per subunit. Present in synaptic regions of RIC interneurons. Present in gonadal sheath cells of hermaphrodites (at protein level). Worms are viable and healthy, but have slightly reduced locomotion rates, and defects in the inhibition of pharyngeal pumping and egg laying in the absence of food. Belongs to the copper type II ascorbate-dependent monooxygenase family.