Genome-wide location of the coactivator mediator: Binding without activation and transient Cdk8 interaction on DNA

JC Andrau, L van de Pasch, P Lijnzaad, T Bijma, MG Koerkamp, J van de Peppel, M Werner, FCP Holstege*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

129 Citations (Scopus)

Abstract

Mediator is a general coactivator of RNA polymerase II (Pol II) transcription. Genomic location analyses of different Mediator subunits indicate a uniformly composed core complex upstream of active genes but unexpectedly also upstream of inactive genes and on the coding regions of some highly active genes. The repressive Cdk8 submodule is associated with core Mediator at all sites but with a lower degree of occupancy, indicating transient interaction, regardless of promoter activity. This suggests gene-specific regulation of Cdk8 activity, rather than regulated Cdk8 recruitment. Mediator presence is not necessarily linked to transcription. This goes beyond Cdk8-repressed genes, indicating that Mediator can mark some regulatory regions ahead of additional signals. Overlap with intergenic Pol II location in stationary phase points to a role as a binding platform for inactive Pol II during quiescence. These results shed light on Cdk8 repression, suggest additional roles for Mediator, and query models of recruitment-coupled regulation.

Original languageEnglish
Pages (from-to)179-192
Number of pages14
JournalMolecular Cell
Volume22
Issue number2
DOIs
Publication statusPublished - 21 Apr 2006
Externally publishedYes

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