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Mol Cell Biol, May 1998, p. 2668-2676, Vol. 18, No. 5
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Yeast RNA Polymerase II Transcription In Vitro Is Inhibited in the Presence of Nucleotide Excision Repair: Complementation of Inhibition by Holo-TFIIH and Requirement for RAD26

Zhaoyang You, William J. Feaver, and Errol C. Friedberg*

Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas 75235

Received 22 December 1997/Returned for modification 6 February 1998/Accepted 20 February 1998

The Saccharomyces cerevisiae transcription factor IIH (TFIIH) is essential both for transcription by RNA polymerase II (RNAP II) and for nucleotide excision repair (NER) of damaged DNA. We have established cell extracts which support RNAP II transcription from the yeast CYC1 promoter or NER of transcriptionally silent damaged DNA on independent plasmid templates and substrates. When plasmid templates and substrates for both processes are simultaneously incubated with these extracts, transcription is significantly inhibited. This inhibition is strictly dependent on active NER and can be complemented with purified holo-TFIIH. These results suggest that in the presence of active NER, TFIIH is preferentially mobilized from the basal transcription machinery for use in NER. Inhibition of transcription in the presence of active NER requires the RAD26 gene, the yeast homolog of the human Cockayne syndrome group B gene (CSB).

* Corresponding author. Mailing address: Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235. Phone: (214) 648-4020. Fax: (214) 648-4067. E-mail: friedberg.errol{at}pathology.swmed.edu.

Mol Cell Biol, May 1998, p. 2668-2676, Vol. 18, No. 5
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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