Elongating RNA Polymerase II Is Disassembled through Specific Degradation of Its Largest but Not Other Subunits in Response to DNA Damage in Vivo*

Elongating RNA Polymerase II Is Disassembled through Specific Degradation of Its Largest but Not Other Subunits in Response to DNA Damage in Vivo*
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响应体内 DNA 损伤,延伸 RNA 聚合酶 II 通过其最大亚基(而非其他亚基)的特异性降解而被分解*

DOI:
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发表时间:
2008
影响因子:
4.8
通讯作者:
S. Bhaumik
S. Bhaumik
中科院分区:
生物学2区
文献类型:
--
作者:
Shivani Malik;S. Bagla;Priyasri Chaurasia;Zhenhong Duan;S. Bhaumik

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尽管先前的生化研究已经证明了RNA聚合酶II的最大亚基Rpb1p在DNA损伤时的全局降解,但仍不清楚Rpb1p的起始或延长形式是以体内降解为目标的。此外,RNA聚合酶II的其他成分是否因DNA损伤而降解仍是未知的。在这里,我们证明了Rpb1p亚单位的延长,但不是启动,形式的RNA聚合酶II在活性基因降解,以响应4-硝基喹啉-1-氧化物诱导的DNA损伤酿酒酵母。然而,RNA聚合酶II的其他亚单位不会因DNA损伤而降解。此外,我们发现Rpb1p对于RNA聚合酶II在活性基因上的组装是必不可少的,因此,DNA损伤后Rpb1p的降解分解了延长的RNA聚合酶II。综上所述,我们的数据表明,Rpb1p而不是延伸RNA聚合酶II的其他亚单位对DNA损伤有特异性的降解,并且这种Rpb1p的降解对于在体内DNA损伤处延长的RNA聚合酶II的分解是至关重要的。
Although previous biochemical studies have demonstrated global degradation of the largest subunit, Rpb1p, of RNA polymerase II in response to DNA damage, it is still not clear whether the initiating or elongating form of Rpb1p is targeted for degradation in vivo. Further, whether other components of RNA polymerase II are degraded in response to DNA damage remains unknown. Here, we show that the Rpb1p subunit of the elongating, but not initiating, form of RNA polymerase II is degraded at the active genes in response to 4-nitroquinoline-1-oxide-induced DNA damage in Saccharomyces cerevisiae. However, other subunits of RNA polymerase II are not degraded in response to DNA damage. Further, we show that Rpb1p is essential for RNA polymerase II assembly at the active gene, and thus, the degradation of Rpb1p following DNA damage disassembles elongating RNA polymerase II. Taken together, our data demonstrate that Rpb1p but not other subunits of elongating RNA polymerase II is specifically degraded in response to DNA damage, and such a degradation of Rpb1p is critical for the disassembly of elongating RNA polymerase II at the DNA lesion in vivo.
DOI: 10.1016/s0921-8777(01)00097-0
发表时间: 2001-09-04
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影响因子: --
作者:
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发表时间: 2001-02-25
期刊: MUTATION RESEARCH-DNA REPAIR
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通讯作者: Hanawalt, PC
DOI: 10.1126/science.2683079
发表时间: 1989-11-03
期刊: SCIENCE
影响因子: 56.9
作者:
HARTWELL, LH;WEINERT, TA
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