CDK8

Function

Component of the Mediator complex, a coactivator involved in regulated gene transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. Mediator is recruited to promoters by direct interactions with regulatory proteins and serves as a scaffold for the assembly of a functional pre-initiation complex with RNA polymerase II and the general transcription factors. Phosphorylates the CTD (C-terminal domain) of the large subunit of RNA polymerase II (RNAp II), which may inhibit the formation of a transcription initiation complex. Phosphorylates CCNH leading to down-regulation of the TFIIH complex and transcriptional repression. Recruited through interaction with MAML1 to hyperphosphorylate the intracellular domain of NOTCH, leading to its degradation.

Involvement in disease

Intellectual developmental disorder with hypotonia and behavioral abnormalities

IDDHBA

An autosomal dominant neurodevelopmental disorder with onset in infancy. IDDHBA is characterized by hypotonia, global developmental delay, learning disability, and behavioral abnormalities, such as autistic features and attention deficit-hyperactivity disorder. Additional variable features may include non-specific facial dysmorphism, congenital heart defects, ocular anomalies, and poor feeding.

None

The disease is caused by variants affecting the gene represented in this entry.

Sequence Similarities

Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. CDC2/CDKX subfamily.

Cellular localization

• Nucleus

Alternative names

Cyclin-dependent kinase 8, Cell division protein kinase 8, Mediator complex subunit CDK8, Mediator of RNA polymerase II transcription subunit CDK8, Protein kinase K35, CDK8

Database links

swissprot:P49336 omim:603184 entrezGene:1024

Other research areas

• Immuno-oncology