title: Binding of BAZF and Bc16 to STAT6-binding DNA sequences.
abstract: BAZF, a family member of Bcl6, can function as a sequence-specific transcriptional repressor. We determined BAZF-binding DNA sequence. The consensus binding sequence (CBS) of BAZF is almost the same as those of Bcl6 previously described. Three nucleotides of T, G and A at position 6, 8, and 9 in the CBS (5'-ATTCCTAGAAAG-3') are important nucleotides for binding of both BAZF and Bcl6. Since a part (5'-TTC-CTA-GAA-3') of the CBS resembled the sequence motif (5'-TTC-(N3-4)-GAA-3') bound by STAT factors, BAZF and Bcl6 can bind to the CD23b-STAT6-binding sequence (5'-TTTC-TTA-GAAAT-3'), the immunoglobulin germline epsilon-STAT6-binding sequence (5'-CTTC-CCAA-GAAC-3'), and the IL4-STAT6-binding sequence (5'-TTTC-CCA-GAAAA-3') with weak affinity. However, a mutation of C nucleotide to T nucleotide in the IL4-STAT6-binding sequence (5'-TTTC-CTA-GAAAA-3') strongly increased the binding activity of BAZF and Bcl6. These results suggest that BAZF and Bcl6 can repress some of STAT-induced transcription by binding to DNA sequences recognized by STAT factors.
authors.affiliation: Department of Developmental Genetics, Chiba University Graduate School of Medicine, Chiba, 260-8670, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hartatik
authors.forename: S
authors.initials: S
authors.lastname: Okada
authors.forename: S
authors.initials: S
authors.lastname: Okabe
authors.forename: M
authors.initials: M
authors.lastname: Arima
authors.forename: M
authors.initials: M
authors.lastname: Hatano
authors.forename: T
authors.initials: T
authors.lastname: Tokuhisa
mesh_terms: D000818:Animals; D001667:Binding, Competitive / Q000187:drug effects / Q000502:physiology; D002460:Cell Line; D016384:Consensus Sequence; D004247:DNA / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D005982:Glutathione Transferase / Q000235:genetics; D015847:Interleukin-4 / Q000378:metabolism; D051379:Mice; D016297:Mutagenesis, Site-Directed; D009841:Oligonucleotides / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D051560:Proto-Oncogene Proteins c-bcl-6; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012045:Regulatory Sequences, Nucleic Acid / Q000502:physiology*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D050800:STAT6 Transcription Factor; D017422:Sequence Analysis, DNA; D015398:Signal Transduction / Q000502:physiology; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D016335:Zinc Fingers / Q000502:physiology
chemical_list: C113027:Bcl6b protein, mouse; D004268:DNA-Binding Proteins; D009841:Oligonucleotides; D011518:Proto-Oncogene Proteins; D051560:Proto-Oncogene Proteins c-bcl-6; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D050800:STAT6 Transcription Factor; C494100:Stat6 protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors; D015847:Interleukin-4; D004247:DNA; D005982:Glutathione Transferase