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Molecular and Cellular Biology, April 2001, p. 2736-2742, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2736-2742.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Yeast NC2 Associates with the RNA Polymerase II Preinitiation Complex and Selectively Affects Transcription In Vivo

Joseph V. Geisberg,1 Frank C. Holstege,2 Richard A. Young,2 and Kevin Struhl1,*

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115,1 and Whitehead Institute for Biomedical Research and Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 021422

Received 4 December 2000/Returned for modification 10 January 2001/Accepted 22 January 2001

NC2 (Dr1-Drap1 or Bur6-Ydr1) has been characterized in vitro as a general negative regulator of RNA polymerase II (Pol II) transcription that interacts with TATA-binding protein (TBP) and inhibits its function. Here, we show that NC2 associates with promoters in vivo in a manner that correlates with transcriptional activity and with occupancy by basal transcription factors. NC2 rapidly associates with promoters in response to transcriptional activation, and it remains associated under conditions in which transcription is blocked after assembly of the Pol II preinitiation complex. NC2 positively and negatively affects approximately 17% of Saccharomyces cerevisiae genes in a pattern that resembles the response to general environmental stress. Relative to TBP, NC2 occupancy is high at promoters where NC2 is positively required for normal levels of transcription. Thus, NC2 is associated with the Pol II preinitiation complex, and it can play a direct and positive role at certain promoters in vivo.

* Corresponding author. Mailing address: Dept. of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115. Phone: (617) 432-2104. Fax: (617) 432-2529. E-mail: kevin{at}hms.harvard.edu.

Molecular and Cellular Biology, April 2001, p. 2736-2742, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2736-2742.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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