Predicted to enable cuprous ion binding activity. Predicted to be involved in chemical synaptic transmission; synapse organization; and synaptic vesicle endocytosis. Predicted to act upstream of or within regulation of dopamine secretion. Predicted to be located in several cellular components, including extracellular region; nucleus; and synapse. Predicted to be active in axon terminus; cytoplasm; and neuronal cell body. Human ortholog(s) of this gene implicated in Alzheimer's disease; Lewy body dementia; Parkinson's disease; Parkinson's disease 1; and Parkinson's disease 4. Orthologous to several human genes including OTUD4 (OTU deubiquitinase 4).