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| Protein Expr. Purif. Aug (1996); 8(1):85-90 | |
| A novel collection of accessory factors associated with yeast RNA polymerase II. | |
| Wade PA, Werel W, Fentzke RC, Thompson NE, Leykam JF, Burgess RR, Jaehning JA, Burton ZF | |
| Department of Biochemistry, Biophysics and Genetics, University of Colorado Health Sciences Center, Denver, Colorado, 80262, USA. | |
| Abstract: A relatively simple subset of general transcription factors is sufficient for transcript initiation by RNA polymerase II. However, a recently identified "holoenzyme" contains additional accessory proteins required for mediating signals from some activators (Y-J. Kim et al., 1994, Cell 77, 599-608; A. Koleske and R. Young, 1994, Nature 368, 466-469). By immobilizing RNA polymerase II and associated proteins (RAPs) from a transcriptionally active yeast extract, we have identified a novel collection of proteins distinct from those found in the holoenzyme. The eluted RAP fraction did not contain the holoenzyme components Srb2,4,5 + 6p, Gal11p, or Sug1p, but did include the known transcription factors TFIIB and TFIIS and the three subunits of yeast TFIIF (Ssu71p/Tfg1p, Tfg2p, and Anc1p/Tfg3p). Also isolated as RAPs are two proteins (Cdc73p and Paf1p) with interesting connections to gene expression. Mutations in CDC73 and PAF1 affect cell growth and the abundance of transcripts from a subset of yeast genes (X. Shi et al., Mol. Cell. Biol., 1996 16, 669-676). The RAP fraction may therefore define one or more functional forms of RNA polymerase II distinct from the activator-mediating holoenzyme. | |
| [PUBMED: 8812838] |   |
| Copyright © 2009, Tyers Lab, The Samuel Lunenfeld Research Institute, Mount Sinai Hospital, All Rights Reserved. |
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| BioGRID: A General Repository for Interaction Datasets. Chris Stark, Bobby-Joe Breitkreutz, Teresa Reguly, Lorrie Boucher, Ashton Breitkreutz, Mike Tyers. Nucleic Acids Res. Jan 1;34:D535-9. |