a protein kinase of the CDK family. Forms a trimeric complex with cyclin H and MAT1, which functions as a Cdk-activating kinase (CAK). Activates the cyclin-associated kinases CDK1, -2, -4 and -6. An essential component of the transcription factor TFIIH, that is involved in transcription initiation and DNA repair. Serves as a direct link between the regulation of transcription and the cell cycle. Phosphorylates and activates RNA polymerase II, allowing its escape from the promoter and elongation of the transcripts. Involved in cell cycle control and in RNA transcription by RNA polymerase II. Its expression and activity are constant throughout the cell cycle. Note: This description may include information from UniProtKB.
Protein type: CDK family; CDK/CDK7 subfamily; CDK7 subfamily; CMGC group; Cell cycle regulation; EC 126.96.36.199; EC 188.8.131.52; Kinase, protein; Nuclear receptor co-regulator; Protein kinase, CMGC; Protein kinase, Ser/Thr (non-receptor)
Molecular Function: DNA-dependent ATPase activity; kinase activity; protein C-terminus binding; protein kinase activity; protein serine/threonine kinase activity; RNA polymerase subunit kinase activity
Biological Process: cell cycle arrest; cell proliferation; G1/S transition of mitotic cell cycle; G2/M transition of mitotic cell cycle; mRNA capping; nucleotide-excision repair, preincision complex assembly; positive regulation of transcription from RNA polymerase II promoter; regulation of cyclin-dependent protein kinase activity; RNA elongation from RNA polymerase I promoter; RNA elongation from RNA polymerase II promoter; snRNA transcription from RNA polymerase II promoter; termination of RNA polymerase I transcription; transcription from RNA polymerase II promoter; transcription initiation from RNA polymerase I promoter; transcription initiation from RNA polymerase II promoter; transcription-coupled nucleotide-excision repair