cyb-3 encodes one of four C. elegans cyclin B family members that is most closely related to the B3-type cyclins; cyb-3 is required for a number of dynein-related mitotic processes and specifically for initiation of anaphase chromosome segregation; cyb-3 is also required for completion of meiosis II and proper pronuclear migration, centrosome maturation, and pronuclear condensation in the fertilized oocyte; cyb-3 is also essential for embryonic viability.
Enables cyclin-dependent protein serine/threonine kinase regulator activity. Involved in several processes, including chromosome organization; regulation of cell cycle; and sexual reproduction. Acts upstream of or within nematode male tail tip morphogenesis. Located in cytoplasm and nucleus. Expressed in several structures, including EMS; Psub2; germ cell; germ line; and male gonad. Is an ortholog of human CCNB3 (cyclin B3).