Enables protein kinase activity. Acts upstream of or within determination of left/right symmetry; heart development; and protein phosphorylation. Predicted to be located in cytosol and nuclear speck. Is expressed in several structures, including alimentary system; brain; cardiovascular system; genitourinary system; and hemolymphoid system gland. Orthologous to human PSKH1 (protein serine kinase H1). [provided by Alliance of Genome Resources, Apr 2022]