Insights into how Spt5 functions in transcription elongation and repressing transcription coupled DNA repair.

Insights into how Spt5 functions in transcription elongation and repressing transcription coupled DNA repair.
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DOI:
10.1093/nar/gku333
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发表时间:
2014-06
影响因子:
14.9
通讯作者:
Li S
Li S
中科院分区:
生物学2区
文献类型:
--
作者:
Li W;Giles C;Li S

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转录延伸因子Spt5和RNA聚合酶II (RNAP II)的亚基Rpb4与Rpb7形成亚复合物,在真核细胞的转录延伸和转录偶联DNA修复(TCR)的抑制中发挥重要作用。Spt5如何与RNAP II物理相互作用,以及Spt5和Rpb4/7如何协调实现不同的功能一直是谜。通过将非天然氨基酸对苯甲酰-l -苯丙氨酸(一种光反应交联剂)结合到特定位点,我们绘制了酿酒酵母中Spt5和RNAP II之间的相互作用图谱。Spt5通过其KOW4-5结构域与Rpb4/7广泛相互作用。Spt5还与RNAP II的两个最大亚基Rpb1和Rpb2在钳位、突起和壁结构域相互作用。这些相互作用可以将夹子锁定在封闭构象上,并将被转录的DNA包裹在RNAP II的中心裂缝中。Spt5 KOW4-5结构域的缺失降低了转录延伸率,降低了TCR。我们的研究结果表明,Spt5是将RNAP II复合物保持在封闭构象中的关键协调物,该构象对转录延伸具有高度的能力,但对TCR具有抑制作用。
Spt5, a transcription elongation factor, and Rpb4, a subunit of RNA polymerase II (RNAP II) that forms a subcomplex with Rpb7, play important roles in transcription elongation and repression of transcription coupled DNA repair (TCR) in eukaryotic cells. How Spt5 physically interacts with RNAP II, and if and/or how Spt5 and Rpb4/7 coordinate to achieve the distinctive functions have been enigmatic. By site-specific incorporation of the unnatural amino acid p-benzoyl-L-phenylalanine, a photoreactive cross-linker, we mapped interactions between Spt5 and RNAP II in Saccharomyces cerevisiae. Through its KOW4-5 domains, Spt5 extensively interacts with Rpb4/7. Spt5 also interacts with Rpb1 and Rpb2, two largest subunits of RNAP II, at the clamp, protrusion and wall domains. These interactions may lock the clamp to the closed conformation and enclose the DNA being transcribed in the central cleft of RNAP II. Deletion of Spt5 KOW4-5 domains decreases transcription elongation and derepresses TCR. Our findings suggest that Spt5 is a key coordinator for holding the RNAP II complex in a closed conformation that is highly competent for transcription elongation but repressive to TCR.
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