| Yeast Rpb9 plays an important role in ubiquitylation and degradation of Rpb1 in response to UV-induced DNA damage. | |
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MedLine Citation:
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PMID: 17452455 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Rpb9, a nonessential subunit of RNA polymerase II (Pol II), has multiple transcription-related functions in Saccharomyces cerevisiae, including transcription elongation and transcription-coupled repair (TCR). Here we show that, in response to UV radiation, Rpb9 also functions in promoting ubiquitylation and degradation of Rpb1, the largest subunit of Pol II. This function of Rpb9 is not affected by any pathways of nucleotide excision repair, including TCR mediated by Rpb9 itself and by Rad26. Rpb9 is composed of three distinct domains: the N-terminal Zn1, the C-terminal Zn2, and the central linker. The Zn2 domain, which is dispensable for transcription elongation and TCR functions, is essential for Rpb9 to promote Rpb1 degradation, whereas the Zn1 and linker domains, which are essential for transcription elongation and TCR functions, play a subsidiary role in Rpb1 degradation. Coimmunoprecipitation analysis suggests that almost the full length of Rpb9 is required for a strong interaction with the core Pol II: deletion of the Zn2 domain causes dramatically weakened interaction, whereas deletion of Zn1 and the linker resulted in undetectable interaction. Furthermore, we show that Rpb1, rather than the whole Pol II complex, is degraded in response to UV radiation and that the degradation is primarily mediated by the 26S proteasome. |
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Authors:
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Xuefeng Chen; Christine Ruggiero; Shisheng Li |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2007-04-23 |
Journal Detail:
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Title: Molecular and cellular biology Volume: 27 ISSN: 0270-7306 ISO Abbreviation: Mol. Cell. Biol. Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-06-18 Completed Date: 2007-08-09 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 8109087 Medline TA: Mol Cell Biol Country: United States |
Other Details:
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Languages: eng Pagination: 4617-25 Citation Subset: IM |
Affiliation:
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Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence DNA Damage* DNA Repair / radiation effects DNA, Fungal / metabolism Molecular Sequence Data Proteasome Endopeptidase Complex / metabolism Protein Binding / radiation effects Protein Processing, Post-Translational* Protein Structure, Tertiary RNA Polymerase II / chemistry, metabolism* Saccharomyces cerevisiae / metabolism*, radiation effects Saccharomyces cerevisiae Proteins / chemistry, metabolism* Transcription, Genetic / radiation effects Ubiquitin / metabolism* Ultraviolet Rays* |
| Grant Support | |
ID/Acronym/Agency:
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ES012718/ES/NIEHS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/DNA, Fungal; 0/Saccharomyces cerevisiae Proteins; 0/Ubiquitin; EC 2.7.7.-/RNA Polymerase II; EC 2.7.7.-/RPB1 protein, S cerevisiae; EC 2.7.7.-/Rpb9 protein, S cerevisiae; EC 3.4.25.1/Proteasome Endopeptidase Complex; EC 3.4.99.-/ATP dependent 26S protease |
| Comments/Corrections | |
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