Component of the SRB8-11 complex. The SRB8-11 complex is a regulatory module of the Mediator complex which is itself involved in regulation of basal and activated RNA polymerase II-dependent transcription. The SRB8-11 complex may be involved in the transcriptional repression of a subset of genes regulated by Mediator. It may inhibit the association of the Mediator complex with RNA polymerase II to form the holoenzyme complex. The SRB8-11 complex phosphorylates the C-terminal domain (CTD) of the largest subunit of RNA polymerase II RPB1 at serines 2 and 5. Component of the SRB8-11 complex which consists of SRB8, SSN2/SRB9, SSN3/SRB10 and SSN8/SRB11. The SRB8-11 complex associates with the Mediator complex. The SSN3/SRB10 and SSN8/SRB11 kinase-cyclin pair also associate with the RNA polymerase II holoenzyme. Present with 1730 molecules/cell in log phase SD medium. Belongs to the Mediator complex subunit 12 family.