Enables cyclin binding activity. Involved in several processes, including anaphase-promoting complex-dependent catabolic process; positive regulation of metaphase/anaphase transition of meiotic cell cycle; and sister chromosome movement towards spindle pole involved in meiotic sister chromatid segregation. Part of Cul2-RING ubiquitin ligase complex. Is an ortholog of human ZYG11B (
zyg-11 family member B, cell cycle regulator).