The human PAF1 complex acts in chromatin transcription elongation both independently and cooperatively with SII/TFIIS.

The human PAF1 complex acts in chromatin transcription elongation both independently and cooperatively with SII/TFIIS.
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DOI:
10.1016/j.cell.2009.12.050
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发表时间:
2010-02-19
期刊:
影响因子:
64.5
通讯作者:
Roeder RG
Roeder RG
中科院分区:
生物学1区
文献类型:
--
作者:
Kim J;Guermah M;Roeder RG

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遗传和细胞研究表明,PAF 1复合物(PAF 1C)参与转录相关事件,但没有证据表明其在促进天然染色质模板转录中的直接作用。在这里,我们证明了人PAF 1C(hPAF 1C)的内在能力,以促进激活剂(p53)和组蛋白乙酰转移酶(p300)依赖的转录延长从重组染色质模板在生化定义的RNA聚合酶II转录系统。这代表了PAF 1C的功能不同于其在组蛋白泛素化和甲基化中的既定作用。重要的是,我们进一步证明了hPAF 1C和延伸因子SII/TFIIS之间的强协同作用,以及涉及直接hPAF 1C-SII相互作用和与RNA聚合酶II合作结合的潜在机制。除了一个独特的PAF 1C功能,目前的观察提供了一个不同的转录延伸因子在染色质转录的合作功能的分子机制。
Genetic and cell-based studies have implicated the PAF1 complex (PAF1C) in transcription-associated events, but there has been no evidence showing a direct role in facilitating transcription of a natural chromatin template. Here, we demonstrate an intrinsic ability of human PAF1C (hPAF1C) to facilitate activator (p53)- and histone acetyltransferase (p300)-dependent transcription elongation from a recombinant chromatin template in a biochemically defined RNA polymerase II transcription system. This represents a PAF1C function distinct from its established role in histone ubiquitylation and methylation. Importantly, we further demonstrate a strong synergy between hPAF1C and elongation factor SII/TFIIS and an underlying mechanism involving direct hPAF1C-SII interactions and cooperative binding to RNA polymerase II. Apart from a distinct PAF1C function, the present observations provide a molecular mechanism for the cooperative function of distinct transcription elongation factors in chromatin transcription.
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