[PDF][PDF] Mechanism of SMRT corepressor recruitment by the BCL6 BTB domain

KF Ahmad, A Melnick, S Lax, D Bouchard, J Liu… - Molecular cell, 2003 - cell.com
KF Ahmad, A Melnick, S Lax, D Bouchard, J Liu, CL Kiang, S Mayer, S Takahashi, JD Licht
Molecular cell, 2003cell.com
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 …
Abstract
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 Å. 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.
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