Skip to main content
NCBI home page
Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1991 Aug 15;88(16):7308–7312. doi: 10.1073/pnas.88.16.7308

Two essential components of the Saccharomyces cerevisiae transcription factor TFIIIB: transcription and DNA-binding properties.

G A Kassavetis 1, B Bartholomew 1, J A Blanco 1, T E Johnson 1, E P Geiduschek 1
PMCID: PMC52284  PMID: 1871137

Abstract

RNA polymerase III transcription factor TFIIIB from Saccharomyces cerevisiae contains at least two polypeptides, with apparent masses of 90 and 70 kDa, that were previously identified by photocrosslinking to DNA. It is shown here that TFIIIB can be chromatographically separated into two components, each of which is required for efficient tRNA gene transcription. DNA-protein photocrosslinking experiments show these two components separately contain the 90- and 70-kDa TFIIIB-specific polypeptides. The 70-kDa component forms a heparin-sensitive complex with transcription factor TFIIIC and DNA, stabilizes TFIIIC interaction with the tRNA gene promoter elements, and protects against DNase I digestion in the 3' portion of the upstream DNA sequence that is occupied by TFIIIB. The 90-kDa component of TFIIIB, which only detectably interacts with the TFIIIC-DNA complex when the 70-kDa component is also present, generates the complete DNase I protection pattern of TFIIIB and bestows heparin-insensitivity on the TFIIIB-DNA complex. The resolution of TFIIIB into two functional components further defines the probable steps and interactions involved in the formation of stable transcription complexes.

Full text

PDF
7308

Images in this article

7309Image
on p.7309
7309Image
on p.7309
7310Image
on p.7310
7311Image
on p.7311
7311Image
on p.7311
7311Image
on p.7311
7311Image
on p.7311
7312Image
on p.7312

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Bartholomew B., Kassavetis G. A., Braun B. R., Geiduschek E. P. The subunit structure of Saccharomyces cerevisiae transcription factor IIIC probed with a novel photocrosslinking reagent. EMBO J. 1990 Jul;9(7):2197–2205. doi: 10.1002/j.1460-2075.1990.tb07389.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Braun B. R., Riggs D. L., Kassavetis G. A., Geiduschek E. P. Multiple states of protein-DNA interaction in the assembly of transcription complexes on Saccharomyces cerevisiae 5S ribosomal RNA genes. Proc Natl Acad Sci U S A. 1989 Apr;86(8):2530–2534. doi: 10.1073/pnas.86.8.2530. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Gabrielsen O. S., Marzouki N., Ruet A., Sentenac A., Fromageot P. Two polypeptide chains in yeast transcription factor tau interact with DNA. J Biol Chem. 1989 May 5;264(13):7505–7511. [PubMed] [Google Scholar]
  4. Kassavetis G. A., Braun B. R., Nguyen L. H., Geiduschek E. P. S. cerevisiae TFIIIB is the transcription initiation factor proper of RNA polymerase III, while TFIIIA and TFIIIC are assembly factors. Cell. 1990 Jan 26;60(2):235–245. doi: 10.1016/0092-8674(90)90739-2. [DOI] [PubMed] [Google Scholar]
  5. Kassavetis G. A., Riggs D. L., Negri R., Nguyen L. H., Geiduschek E. P. Transcription factor IIIB generates extended DNA interactions in RNA polymerase III transcription complexes on tRNA genes. Mol Cell Biol. 1989 Jun;9(6):2551–2566. doi: 10.1128/mcb.9.6.2551. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Klekamp M. S., Weil P. A. Partial purification and characterization of the Saccharomyces cerevisiae transcription factor TFIIIB. J Biol Chem. 1986 Feb 25;261(6):2819–2827. [PubMed] [Google Scholar]
  7. Klekamp M. S., Weil P. A. Specific transcription of homologous class III genes in yeast-soluble cell-free extracts. J Biol Chem. 1982 Jul 25;257(14):8432–8441. [PubMed] [Google Scholar]
  8. Margottin F., Dujardin G., Gérard M., Egly J. M., Huet J., Sentenac A. Participation of the TATA factor in transcription of the yeast U6 gene by RNA polymerase C. Science. 1991 Jan 25;251(4992):424–426. doi: 10.1126/science.1989075. [DOI] [PubMed] [Google Scholar]
  9. Parsons M. C., Weil P. A. Purification and characterization of Saccharomyces cerevisiae transcription factor TFIIIC. Polypeptide composition defined with polyclonal antibodies. J Biol Chem. 1990 Mar 25;265(9):5095–5103. [PubMed] [Google Scholar]
  10. Schultz P., Marzouki N., Marck C., Ruet A., Oudet P., Sentenac A. The two DNA-binding domains of yeast transcription factor tau as observed by scanning transmission electron microscopy. EMBO J. 1989 Dec 1;8(12):3815–3824. doi: 10.1002/j.1460-2075.1989.tb08559.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Segall J., Matsui T., Roeder R. G. Multiple factors are required for the accurate transcription of purified genes by RNA polymerase III. J Biol Chem. 1980 Dec 25;255(24):11986–11991. [PubMed] [Google Scholar]
  12. Shastry B. S., Ng S. Y., Roeder R. G. Multiple factors involved in the transcription of class III genes in Xenopus laevis. J Biol Chem. 1982 Nov 10;257(21):12979–12986. [PubMed] [Google Scholar]
  13. Waldschmidt R., Jahn D., Seifart K. H. Purification of transcription factor IIIB from HeLa cells. J Biol Chem. 1988 Sep 15;263(26):13350–13356. [PubMed] [Google Scholar]

Articles from Proceedings of the National Academy of Sciences of the United States of America are provided here courtesy of National Academy of Sciences

RESOURCES