Serine/threonine-protein kinase which is required in the germline to regulate positively lifespan (PubMed:17277769). May play a role in body wall muscle contraction (PubMed:25851606). May be involved in embryonic cytokinesis (PubMed:19528325). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Predominantly localizes in the nucleus in the 1- and 2-cell embryos. Expressed in pharynx, intestine, vulva and body wall muscles. RNAi-mediated knockdown causes a reduction in lifespan but not in a glp-4 bn2 mutant background. In an ife-2 ok306 mutant background, partially reduces the lifespan increase (PubMed:17277769). In a rfl-1 or198 mutant background, partially rescues embryonic viability by restoring normal cytokinesis (PubMed:19528325). Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family.