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Mechanism of SMRT corepressor recruitment by the BCL6 BTB domain.

BCL6 encodes a transcription factor that represses genes necessary for the terminal differentiation of lymphocytes within germinal centers, and the misregulated expression of this factor is strongly implicated in several types of B cell lymphoma. The homodimeric BTB domain of BCL6 (also known as the POZ domain) is required for the repression activity of the protein and interacts directly with the SMRT and N-CoR corepressors that are found within large multiprotein histone deacetylase-containing complexes. We have identified a 17 residue fragment from SMRT that binds to the BCL6 BTB domain, and determined the crystal structure of the complex to 2.2 A. Two SMRT fragments bind symmetrically to the BCL6 BTB homodimer and, in combination with biochemical and in vivo data, the structure provides insight into the basis of transcriptional repression by this critical B cell lymphoma protein.

Pubmed ID: 14690607


  • Ahmad KF
  • Melnick A
  • Lax S
  • Bouchard D
  • Liu J
  • Kiang CL
  • Mayer S
  • Takahashi S
  • Licht JD
  • PrivĂ© GG


Molecular cell

Publication Data

December 23, 2003

Associated Grants

  • Agency: NCI NIH HHS, Id: CA 59936
  • Agency: NCI NIH HHS, Id: R21 CA 99982

Mesh Terms

  • Amino Acid Sequence
  • Crystallography, X-Ray
  • DNA-Binding Proteins
  • Gene Expression Regulation
  • Humans
  • Macromolecular Substances
  • Models, Molecular
  • Molecular Sequence Data
  • Molecular Structure
  • Multiprotein Complexes
  • Nuclear Receptor Co-Repressor 2
  • Protein Binding
  • Protein Structure, Tertiary
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-bcl-6
  • Recombinant Fusion Proteins
  • Repressor Proteins
  • Sequence Alignment
  • Transcription Factors