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The large Mediator (L-Mediator) is a general coactivator of RNA polymerase II transcription and is formed by the reversible association of the small Mediator (S-Mediator) and the kinase-module-harboring Cdk8. It is not known how the kinase module association/dissociation is regulated. We describe the fission yeast Cdk11-L-type cyclin pombe (Lcp1) complex and show that its inactivation alters the global...