A multisubunit complex associated with the RNA polymerase II CTD and TATA-binding protein in yeast

Cell. 1993 Jul 2;73(7):1361-75. doi: 10.1016/0092-8674(93)90362-t.


We report genetic and biochemical evidence that the RNA polymerase II carboxy-terminal domain (CTD) interacts with a large multisubunit complex that contains TATA-binding protein (TBP) and is an integral part of the transcription initiation complex. The isolation and characterization of extragenic suppressors of S. cerevisiae RNA polymerase II CTD truncation mutations led us to identify SRB2, SRB4, SRB5, and SRB6 as genes involved in CTD function in vivo. SRB2 was previously isolated and shown to encode a 23 kd TBP-binding protein. The four SRB proteins and a portion of cellular TBP are components of a high molecular weight multisubunit complex that is tightly bound to RNA polymerase II. This SRB-TBP complex binds specifically to recombinant CTD protein. In vitro transcription and template commitment assays confirm that SRB2 and SRB5 are components of a functional preinitiation complex and are required for efficient transcription initiation.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Binding Sites
  • DNA Mutational Analysis
  • DNA-Binding Proteins / metabolism*
  • Fungal Proteins / genetics*
  • Gene Expression Regulation
  • Mediator Complex
  • Molecular Sequence Data
  • Multienzyme Complexes / chemistry
  • Multienzyme Complexes / genetics*
  • RNA Polymerase II / metabolism*
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins*
  • TATA-Box Binding Protein
  • Transcription Factors / genetics*
  • Transcription Factors / metabolism*
  • Transcription, Genetic*


  • DNA-Binding Proteins
  • Fungal Proteins
  • Mediator Complex
  • Multienzyme Complexes
  • Recombinant Proteins
  • SRB4 protein, S cerevisiae
  • SRB5 protein, S cerevisiae
  • SRB6 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • TATA-Box Binding Protein
  • Transcription Factors
  • RNA Polymerase II

Associated data

  • GENBANK/L09220
  • GENBANK/L09221
  • GENBANK/L09222
  • GENBANK/L09223
  • GENBANK/L09224
  • GENBANK/L09225
  • GENBANK/L12026
  • GENBANK/L12027
  • GENBANK/L12028
  • GENBANK/L33709