Enables protein serine/threonine kinase activity. Involved in peptidyl-serine phosphorylation and regulation of translational initiation. Predicted to be located in nucleoplasm. Predicted to be active in cytoplasm and nucleus. Orthologous to human MKNK1 (MAPK interacting serine/threonine kinase 1). [provided by Alliance of Genome Resources, Apr 2022]