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The SCF-Fbw7 ubiquitin ligase degrades MED13 and MED13L and regulates CDK8 module association with Mediator.

The Mediator complex is an essential transcription regulator that bridges transcription factors with RNA polymerase II. This interaction is controlled by dynamic interactions between Mediator and the CDK8 module, but the mechanisms governing CDK8 module-Mediator association remain poorly understood. We show that Fbw7, a tumor suppressor and ubiquitin ligase, binds to CDK8-Mediator and targets MED13/13L for degradation. MED13/13L physically link the CDK8 module to Mediator, and Fbw7 loss increases CDK8 module-Mediator association. Our work reveals a novel mechanism regulating CDK8 module-Mediator association and suggests an expanded role for Fbw7 in transcriptional control and an unanticipated relationship with the CDK8 oncogene.

Pubmed ID: 23322298


  • Davis MA
  • Larimore EA
  • Fissel BM
  • Swanger J
  • Taatjes DJ
  • Clurman BE


Genes & development

Publication Data

January 15, 2013

Associated Grants

  • Agency: NCI NIH HHS, Id: CA084069
  • Agency: NCI NIH HHS, Id: CA102742
  • Agency: NCI NIH HHS, Id: CA127364
  • Agency: NCI NIH HHS, Id: R01 CA084069
  • Agency: NCI NIH HHS, Id: T32 CA080416
  • Agency: NCI NIH HHS, Id: T32 CA080416

Mesh Terms

  • Cell Line, Tumor
  • Cyclin-Dependent Kinase 8
  • Gene Expression Regulation, Neoplastic
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • Mediator Complex
  • Protein Binding
  • Proteolysis
  • SKP Cullin F-Box Protein Ligases
  • Ubiquitination