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      POZ domain transcription factor, FBI-1, represses transcription of ADH5/FDH by interacting with the zinc finger and interfering with DNA binding activity of Sp1.

      The Journal of Biological Chemistry
      Aldehyde Oxidoreductases, genetics, metabolism, Amino Acid Sequence, Animals, Cell Nucleus, Chromatin, DNA, DNA-Binding Proteins, Deoxyribonuclease I, Gene Library, HeLa Cells, Humans, Mice, Molecular Sequence Data, Multigene Family, Plasmids, Polymerase Chain Reaction, Precipitin Tests, Promoter Regions, Genetic, Protein Binding, Protein Structure, Tertiary, Sequence Homology, Amino Acid, Sp1 Transcription Factor, Transcription Factors, Transcription, Genetic, Zinc Fingers

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          Abstract

          The POZ domain is a protein-protein interaction motif that is found in many transcription factors, which are important for development, oncogenesis, apoptosis, and transcription repression. We cloned the POZ domain transcription factor, FBI-1, that recognizes the cis-element (bp -38 to -22) located just upstream of the core Sp1 binding sites (bp -22 to +22) of the ADH5/FDH minimal promoter (bp -38 to +61) in vitro and in vivo, as revealed by electrophoretic mobility shift assay and chromatin immunoprecipitation assay. The ADH5/FDH minimal promoter is potently repressed by the FBI-1. Glutathione S-transferase fusion protein pull-down showed that the POZ domains of FBI-1, Plzf, and Bcl-6 directly interact with the zinc finger DNA binding domain of Sp1. DNase I footprinting assays showed that the interaction prevents binding of Sp1 to the GC boxes of the ADH5/FDH promoter. Gal4-POZ domain fusions targeted proximal to the GC boxes repress transcription of the Gal4 upstream activator sequence-Sp1-adenovirus major late promoter. Our data suggest that POZ domain represses transcription by interacting with Sp1 zinc fingers and by interfering with the DNA binding activity of Sp1.

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