Predicted to enable RNA polymerase II CTD heptapeptide repeat kinase activity and cyclin-dependent protein serine/threonine kinase activity. Predicted to be involved in protein phosphorylation. Predicted to act upstream of or within phosphorylation. Part of mediator complex. Is expressed in embryo. Orthologous to human CDK8 (cyclin dependent kinase 8). [provided by Alliance of Genome Resources, Apr 2022]