Predicted to enable opioid receptor binding activity. Predicted to be involved in chemical synaptic transmission; neuropeptide signaling pathway; and sensory perception. Located in cytoplasm and neuronal cell body. Is active in neuronal dense core vesicle lumen and synaptic vesicle. Human ortholog(s) of this gene implicated in spinocerebellar ataxia type 23 and temporal lobe epilepsy. Orthologous to human PDYN (prodynorphin). [provided by Alliance of Genome Resources, Apr 2022]