| Whole genome expression profiles of yeast RNA polymerase II core subunit, Rpb4, in stress and nonstress conditions. | |
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MedLine Citation:
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PMID: 12429747 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Organisms respond to environmental stress by adopting changes in gene expression at the transcriptional level. Rpb4, a nonessential subunit of the core RNA polymerase II has been proposed to play a role in non-stress-specific transcription and in the regulation of stress response in yeast. We find that in addition to the temperature sensitivity of the null mutant of Rpb4, diploid null mutants are also compromised in sporulation and show morphological changes associated with nitrogen starvation. Using whole genome expression analysis, we report here the effects of Rpb4 on expression of genes during normal growth and following heat shock and nutritional starvation. Our analysis shows that Rpb4 affects expression of a small yet significant fraction of the genome in both stress and normal conditions. We found that genes involved in galactose metabolism were dependent on the presence of Rpb4 irrespective of the environmental condition. Rpb4 was also found to affect the expression of several other genes specifically in conditions of nutritional starvation. The general defect in the absence of Rpb4 is in the expression of metabolic genes, especially those involved in carbon metabolism and energy generation. We report that various stresses are affected by RPB4 and that on overexpression the stress-specific activators can partially rescue the corresponding defects. |
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Authors:
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Beena Pillai; Jiyoti Verma; Anju Abraham; Princy Francis; Yadunanda Kumar; Utpal Tatu; Samir K Brahmachari; Parag P Sadhale |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2002-11-11 |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 278 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 2003 Jan |
Date Detail:
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Created Date: 2003-01-28 Completed Date: 2003-04-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 3339-46 Citation Subset: IM |
Affiliation:
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Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, 560 012, India. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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DNA Primers Gene Expression Regulation, Enzymologic Gene Expression Regulation, Fungal* Genome, Fungal* Polymerase Chain Reaction Protein Subunits / chemistry, genetics RNA Polymerase II / genetics* Saccharomyces cerevisiae / enzymology, genetics*, physiology Saccharomyces cerevisiae Proteins / genetics, metabolism Spores, Fungal Trans-Activators / genetics, metabolism Transcription, Genetic* |
| Chemical | |
Reg. No./Substance:
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0/DNA Primers; 0/Protein Subunits; 0/Saccharomyces cerevisiae Proteins; 0/Trans-Activators; EC 2.7.7.-/RNA Polymerase II |
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