The promoter of mouse transcription repressor bach1 is regulated by Sp1 and trans-activated by Bach1

Jiying Sun, Akihiko Muto, Hideto Hoshino, Akira Kobayashi, Shigeko Nishimura, Masayuki Yamamoto, Norio Hayashi, Etsuro Ito, Kazuhiko Igarashi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The Maf recognition element (MARE) is regulated by both activators and repressors. Bach1 and Bach2 repress MARE-dependent transcription by forming heterodimers with Maf-related oncoproteins. In order to gain an understanding of the regulation of bach1 gene expression, we analyzed the structure of the mouse bach1 gene. Comparison of the exon-intron structure of the bach1 gene with those of other NF-E2-related genes indicated that bach1 and bach2 constitute an evolutionarily distinct subfamily among bZip factors. The bach1 promoter region contains two GC boxes that are important for its basal activity and are bound by Spl in K562 cell extracts. In addition, we found an evolutionarily conserved MARE-like element located downstream of the transcription initiation site. Deletion of this element resulted in a higher promoter activity in K562 cells. Bach1 trans-activated its own promoter depending on the presence of the MARE-like element in co-transfection assays. However, Bach1 did not bind to the MARE-like element in electrophoretic mobility shift assays (EMSA). These results suggest that Bach1 activates its own promoter indirectly by inhibiting the putative repressor. Such a positive feedback regulation by the repressor Bach1 may play an important role in maintaining the expression of Bach1 while consolidating repression of other genes with MARE.

Original languageEnglish
Pages (from-to)385-392
Number of pages8
JournalJournal of biochemistry
Volume130
Issue number3
DOIs
Publication statusPublished - 2001 Sep
Externally publishedYes

Keywords

  • Maf
  • Oncogene
  • Promoter
  • Transcription factor
  • Transcription repression

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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