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Molecular and Cellular Biology, August 2001, p. 5031-5040, Vol. 21, No. 15
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.15.5031-5040.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Maf1p, a Negative Effector of RNA Polymerase III in Saccharomyces cerevisiae

Krzysztof Pluta,1 Olivier Lefebvre,2 Nancy C. Martin,3 Wieslaw J. Smagowicz,1 David R. Stanford,4 Steven R. Ellis,3 Anita K. Hopper,4 Andre Sentenac,2 and Magdalena Boguta1,*

Department of Genetics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02 106 Warsaw, Poland1; Department of Biochemistry, University of Louisville Medical Center, Louisville, Kentucky 402923; Department of Biochemistry and Molecular Biology, Milton S. Hershey Medical Center, Pennsylvania State University, Hershey, Pennsylvania 170334; and Service de Biochimie et de Génétique Moléculaire, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France2

Received 1 February 2001/Returned for modification 2 March 2001/Accepted 24 April 2001

Although yeast RNA polymerase III (Pol III) and the auxiliary factors TFIIIC and TFIIIB are well characterized, the mechanisms of class III gene regulation are poorly understood. Previous studies identified MAF1, a gene that affects tRNA suppressor efficiency and interacts genetically with Pol III. We show here that tRNA levels are elevated in maf1 mutant cells. In keeping with the higher levels of tRNA observed in vivo, the in vitro rate of Pol III RNA synthesis is significantly increased in maf1 cell extracts. Mutations in the RPC160 gene encoding the largest subunit of Pol III which reduce tRNA levels were identified as suppressors of the maf1 growth defect. Interestingly, Maf1p is located in the nucleus and coimmunopurifies with epitope-tagged RNA Pol III. These results indicate that Maf1p acts as a negative effector of Pol III synthesis. This potential regulator of Pol III transcription is likely conserved since orthologs of Maf1p are present in other eukaryotes, including humans.

* Corresponding author. Mailing address: Department of Genetics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, 02 106 Warsaw, Poland. Phone: (48 22)659-70-72, ext. 1312. Fax: (48)39121623. E-mail: magda{at}ibbrain.ibb.waw.pl.

Molecular and Cellular Biology, August 2001, p. 5031-5040, Vol. 21, No. 15
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.15.5031-5040.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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