Enables cyclin-dependent protein serine/threonine kinase activity and protein kinase binding activity. Involved in several processes, including positive regulation of meiotic nuclear division; positive regulation of proteasomal ubiquitin-dependent protein catabolic process; and sexual reproduction. Acts upstream of or within nematode male tail tip morphogenesis. Located in chromosome; cytoplasm; and nucleus. Expressed in embryonic cell and germ cell. Human ortholog(s) of this gene implicated in several diseases, including cervical cancer; hepatobiliary system cancer (multiple); and transitional cell carcinoma. Is an ortholog of human CDK1 (cyclin dependent kinase 1).