Details

Autor(en) / Beteiligte

• Siv Gilfillan
• Gertraud Stelzer
• Elisa Piaia
• Markus G. Hofmann
• Michael Meisterernst

Titel

Efficient Binding of NC2·TATA-binding Protein to DNA in the Absence of TATA

Ist Teil von

• The Journal of biological chemistry, 2005-02, Vol.280 (7), p.6222

Ort / Verlag

American Society for Biochemistry and Molecular Biology

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Negative cofactor 2 (NC2) forms a stable complex with TATA-binding protein (TBP) on promoters. This prevents the assembly of transcription factor (TF) IIA and TFIIB and leads to repression of RNA polymerase II transcription. Here we have revisited the interactions of NC2·TBP with DNA. We show that NC2·TBP complexes exhibit a significantly reduced preference for TATA box sequences compared with TBP and TBP·TFIIA complexes. In chromatin immunoprecipitations, NC2 is found on a variety of human TATA-containing and TATA-less promoters. Substantial amounts of NC2 are present in a complex with TBP in bulk chromatin. A complex of NC2·TBP displays a K D for DNA of ∼2 × 10 -9 m for a 35-bp major late promoter oligonucleotide. While preferentially recognizing promoter-bound TBP, NC2 also accelerates TBP binding to promoters and stabilizes TBP·DNA complexes. Our data suggest that NC2 controls TBP binding and maintenance on DNA that is largely independent of a canonical TATA sequence.