Enables identical protein binding activity. Involved in several processes, including circadian regulation of gene expression; entrainment of circadian clock by photoperiod; and locomotor rhythm. Located in several cellular components, including cell cortex; nucleus; and perinuclear region of cytoplasm. Is expressed in several structures, including alimentary system; central nervous system; eye; integumental system; and reproductive system. Orthologous to human USP2 (ubiquitin specific peptidase 2). [provided by Alliance of Genome Resources, Apr 2022]