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Papers In Press, published online ahead of print May 29, 2001
Microbiology and Cell Biology, Indian Institute of Science, BANGALORE, KARNATAKA 560 012
Corresponding Author: pps{at}mcbl.iisc.ernet.in
A major role in regulation of eukaryotic protein coding genes is played by the gene specific transcriptional regulators which recruit the RNA Polymerase II holoenzyme to the specific promoter. Several components of the mediator complex within the holoenzyme also have been shown to affect activation of different subsets of genes. Only recently has it been suggested that besides the largest subunit of RNA polymerase II, smaller subunits like Rpb3 and Rpb5 may have regulatory roles in expression of specific sets of genes. We report here, the role of Rpb4, a non-essential subunit of core RNA polymerase II, in activation of a subset of genes in Saccharomyces cerevisiae. We have shown below, that while constitutive transcription is largely unaffected, activation from various promoters tested is severely compromised in the absence of RPB4. This activation defect can be rescued by the overexpression of cognate activators. We have localised the region of Rpb4 involved in activation to the C-terminal 24 amino acids. We have also shown here that transcriptional activation by artificial recruitment of TBP to the promoter is also defective in the absence of RPB4. Surprisingly, the overexpression of RPB7-the interacting partner of Rpb4 does not rescue the activation defect of all the promoters tested, although it rescues the activation defect of heat shock element containing promoter and the temperature sensitivity associated with RPB4 deletion. Overall, our results imply that Rpb4 and Rpb7 play independent roles in transcriptional regulation of genes.
J. Biol. Chem, 10.1074/jbc.M010952200
Submitted on December 5, 2000
Revised on May 26, 2001
Accepted on May 29, 2001
Rpb4, a non essential subunit of core RNA Polymerase II of Saccharomyces cerevisiae is important for activated transcription of a subset of genes
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