A mammalian SRB protein associated with an RNA polymerase II holoenzyme

Nature. 1996 Mar 7;380(6569):82-5. doi: 10.1038/380082a0.


A large multisubunit complex containing RNA polymerase II, general transcription factors and SRB regulatory proteins initiates transcription of class II genes in yeast cells. The SRB proteins are a hallmark of this RNA polymerase II holoenzyme as they are found only in this complex, where they contribute to the response to regulators. We have now isolated a human homologue of the yeast SRB7 gene and used antibodies against human SRB7 protein to purify and characterize a mammalian RNA polymerase II holoenzyme containing the general transcription factors TFIIE and TFIIH. This holoenzyme is more responsive to transcriptional activators than core RNA polymerase II when assayed in the presence of coactivators.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Cattle
  • Chromatography, Affinity
  • DNA, Complementary
  • Fungal Proteins / genetics
  • Fungal Proteins / metabolism
  • Genetic Complementation Test
  • HeLa Cells
  • Humans
  • Mediator Complex
  • Molecular Sequence Data
  • RNA Polymerase II / isolation & purification
  • RNA Polymerase II / metabolism*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins*
  • Sequence Homology, Amino Acid
  • TATA-Binding Protein Associated Factors*
  • Transcription Factor TFIID*
  • Transcription Factor TFIIH
  • Transcription Factors / genetics
  • Transcription Factors / isolation & purification
  • Transcription Factors / metabolism*
  • Transcription Factors, TFII*
  • Transcription, Genetic


  • DNA, Complementary
  • Fungal Proteins
  • MED21 protein, human
  • Mediator Complex
  • SRB7 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • TAF6 protein, S cerevisiae
  • TATA-Binding Protein Associated Factors
  • Transcription Factor TFIID
  • Transcription Factors
  • Transcription Factors, TFII
  • transcription factor TFIIE
  • Transcription Factor TFIIH
  • RNA Polymerase II

Associated data

  • GENBANK/U46837