OBF1 enhances transcriptional potential of Oct1

Katharina Lins, Attila Reményi, Alexey Tomilin, Steffen Massa, Matthias Wilmanns, Patrick Matthias, Hans R. Schöler

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The POU transcription factors Oct1 and Oct2 bind to DNA in various monomer and dimer configurations. Depending on the DNA sequence to which they bind, the dimers are arranged in configurations that are either accessible (PORE sequence) or inaccessible (MORE sequence) to the B-cell-specific cofactor OBF1 (OcaB, Bob1). As shown previously, the MORE and related sequences (such as the heptamer/octamer motif) are found in immunoglobulin heavy chain promoters. Here we show that the expression of Osteopontin, which contains a PORE sequence in its enhancer region, depends on the presence of OBF1 in B cells. OBF1 alleviates DNA sequence requirements of the Oct1 dimer on PORE-related sequences in vitro. Furthermore, OBF1 stabilizes POU dimer-DNA interactions and overrides Oct1 interface mutations, which abolish PORE-mediated dimerization without OBF1. Our data indicate that the PORE-type Oct1 or Oct2 dimer, rather than the monomer, is the primary target of the cofactor OBF1. Based on our biochemical data, we propose a mode of OBF1-Oct1 dimer interaction, suggesting a novel arrangement of the subdomain connectivities.

Original languageEnglish
Pages (from-to)2188-2198
Number of pages11
JournalEMBO Journal
Volume22
Issue number9
DOIs
Publication statusPublished - May 1 2003

Keywords

  • Gene regulation
  • OBF1
  • POU
  • Transcription factor

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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  • Cite this

    Lins, K., Reményi, A., Tomilin, A., Massa, S., Wilmanns, M., Matthias, P., & Schöler, H. R. (2003). OBF1 enhances transcriptional potential of Oct1. EMBO Journal, 22(9), 2188-2198. https://doi.org/10.1093/emboj/cdg199