Description
Description: Recombinant full-length human CDK8/CyclinC was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag.
Scientific Background: CDK8 is a member of the CDK family which are important regulators of cell cycle progression. CDK8 associates with Cyclin C and is a component of the RNA polymerase II holoenzyme complex that phosphorylates the carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II (1). CDK8 regulate transcription by targeting the CDK7/cyclin H subunits of the general transcription initiation factor IIH (TFIIH). Inhibition of CDK8 expression inhibits proliferation in colon cancer cells characterized by high levels of CDK8 and beta-catenin hyperactivity. CDK8 kinase activity is necessary for beta-catenin-driven transformation and for expression of several beta-catenin transcriptional targets (2)