Enables protein kinase binding activity. Acts upstream of or within negative regulation of cell cycle G1/S phase transition and sensory perception of sound. Part of cyclin D2-CDK4 complex. Is expressed in several structures, including central nervous system; genitourinary system; liver lobe; retina; and trigeminal nerve. Orthologous to human CDKN2D (cyclin dependent kinase inhibitor 2D). [provided by Alliance of Genome Resources, Apr 2022]