Cdk11-CyclinL Controls the Assembly of the RNA Polymerase II Mediator Complex

Julie Drogat, Valérie Migeot, Elise Mommaerts, Caroline Mullier, Marc Dieu, Harm van Bakel, Damien Hermand

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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 expression profile in a manner very similar to that of mutations of the kinase module. Cdk11 is broadly distributed onto chromatin and phosphorylates the Med27 and Med4 Mediator subunits on conserved residues. The association of the kinase module and the S-Mediator is strongly decreased by the inactivation of either Cdk11 or the mutation of its target residues on the Mediator. These results show that Cdk11-Lcp1 regulates the association of the kinase module and the S-Mediator to form the L-Mediator complex.
Original languageEnglish
Pages (from-to)1068-76
Number of pages9
JournalCell Reports
Issue number5
Publication statusPublished - 2012


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