TATA-binding protein residues implicated in a functional interplay between negative cofactor NC2 (Dr1) and general factors TFIIA and TFIIB

Kook Kim Tae Kook Kim, Y. Zhao, H. Ge, R. Bernstein, R. G. Roeder*

*Corresponding author for this work

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The TATA-binding protein (TBP) plays a key role in transcription initiation. Several negative cofactors (NC1, NC2, and Dr1) are known to interact with TBP in a manner that prevents productive interactions of transcription factors TFIIA and TFIIB with promoter-bound TBP. To gain insights into the regulatory interplay on the surface of TBP, we have employed mutant forms of TBP to identify amino acid residues important for interactions with the negative regulatory cofactor NC2 and the general factor TFIIB. The results show the involvement of distinct domains of TBP in these interactions. Residues (Lys-133, Lys-145, and Lys-151) in the basic repeat region are important for interactions with NC2, as well as with TFIIA (Buratowski, S., and Zhou, H. (1992) Science 255, 1130-1132; Lee, D. K., DeJong, J., Hashimoto, S., Horikoshi, M. and Roeder, R. G. (1992) Mol. Cell. Biol. 12, 5189-5196), whereas a residue (Leu-189) in the second stirrup-like loop spanning S2' and S3' is required for interaction with TFIIB. In addition, we demonstrate that NC2 is identical to the previously cloned negative cofactor Dr1. The implications of these results for TBP structure and function are discussed.

Original languageEnglish (US)
Pages (from-to)10976-10981
Number of pages6
JournalJournal of Biological Chemistry
Volume270
Issue number18
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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