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• W2167269002 abstract "It has been hypothesized that the degradation of the largest subunit of RNA polymerase II (polIILS) is required for transcription-coupled repair (TCR) of UV light-induced transcription-blocking lesions. In this study we further investigated the mechanism of UV-induced degradation of polIILS using cell lines with specific defects in TCR or in the recovery of RNA synthesis. It was found that the hypophosphorylated IIa form of polIILS rapidly decreased following UV-irradiation in all cell lines tested. Inhibition of proteasome activity resulted in an increase of the hyperphosphorylated IIo form of polIILS in UV-irradiated cells, while inhibition of CTD-kinases resulted in the retention of the IIa form. In UV-irradiated Cockayne’s syndrome cells, which are defective in TCR, the levels of the IIo form increased in a similar manner as when proteasome inhibitors were added to UV-irradiated normal cells. In contrast, TCR-deficient HCT116 cells, which lack the mismatch repair protein MLH1, showed proficient degradation of polIILS as did cells with deficiencies in the recovery of RNA synthesis following UV-irradiation due to defective p53. Furthermore, we found that proteasome function was important for the recovery of mRNA synthesis even in TCR-deficient HCT116 cells. Our results suggest that proteasome-mediated degradation of polIILS is preceded by phosphorylation of the C-terminal domain of polIILS and requires the CS-A and CS-B but not MLH1 or p53 proteins. Furthermore, our results suggest that following UV-irradiation, the degradation of polIILS is required for the efficient recovery of mRNA synthesis but not for TCR per se." @default.
• W2167269002 created "2016-06-24" @default.
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• W2167269002 date "2001-03-01" @default.
• W2167269002 modified "2023-10-18" @default.
• W2167269002 title "UV light-induced degradation of RNA polymerase II is dependent on the Cockayne’s syndrome A and B proteins but not p53 or MLH1" @default.
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• W2167269002 doi "https://doi.org/10.1016/s0921-8777(00)00064-1" @default.
• W2167269002 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11182541" @default.
• W2167269002 hasPublicationYear "2001" @default.
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