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Histone deacetylase 3 binds to and regulates the multifunctional transcription factor TFII-I.

Wen YD, Cress WD, Roy AL, Seto E
The Journal of biological chemistry


Histone deacetylase 3 (HDAC3) is one of four members of the human class I histone deacetylases that are implicated in transcriptional repression through deacetylation of acetyllysines in amino-terminal tails of core histones. In an immunoaffinity purification using anti-HDAC3, transcription factor TFII-I copurified with HDAC3. Specificity of the HDAC3-TFII-I interaction was confirmed by coimmunoprecipitation of epitope-tagged proteins, GST pull-down assays, and protein colocalization with indirect immunofluorescence. An anti-TFII-I immunoprecipitate contained histone deacetylase enzymatic activity. Mutational analyses revealed that the carboxyl-terminal of HDAC3 (residues 373-401) and residues 363-606 of TFII-I were required for the HDAC3-TFII-I interaction. Transcriptional activation by TFII-I was severely reduced by overexpression of HDAC3. These results suggest that HDAC3 modulates some of the functions of TFII-I and provides a link between histone deacetylase and a multifunctional transcriptional activator.

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