Enables cyclin-dependent protein serine/threonine kinase activity. Involved in protein phosphorylation and transcription by RNA polymerase II. Located in several cellular components, including cytoskeleton; cytosol; and nucleus. Part of transcription factor TFIIH holo complex. Orthologous to human CDK7 (cyclin dependent kinase 7). [provided by Alliance of Genome Resources, Apr 2022]