Enables cyclin-dependent protein serine/threonine kinase regulator activity. Acts upstream of or within several processes, including DNA metabolic process; homologous chromosome pairing at meiosis; and regulation of protein localization. Part of cyclin E2-CDK2 complex. Is expressed in several structures, including cerebral cortex and genitourinary system. Human ortholog(s) of this gene implicated in castration-resistant prostate carcinoma. Orthologous to human CCNE2 (cyclin E2). [provided by Alliance of Genome Resources, Apr 2022]