RNA polymerase I-specific subunits promote polymerase clustering to enhance the rRNA gene transcription cycle.

RNA polymerase I-specific subunits promote polymerase clustering to enhance the rRNA gene transcription cycle.
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RNA聚合酶I特异性亚基促进聚合酶聚类以增强RRNA基因转录周期。

DOI:
10.1083/jcb.201006040
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发表时间:
2011-01-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Gadal O
Gadal O
中科院分区:
其他
文献类型:
--
作者:
Albert B;Léger-Silvestre I;Normand C;Ostermaier MK;Pérez-Fernández J;Panov KI;Zomerdijk JC;Schultz P;Gadal O

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Pol I亚基Rpa34和Rpa49是延长和生产35S rRNA所必需的,它们促进邻近Pol I复合体的聚集,以增强rRNA基因的转录周期。RNA聚合酶I(Pol I)产生大的核糖体RNA(RRNAs)。在本研究中,我们证明了在Pol II和Pol III复合体中没有对应的Rpa49和Rpa34Pol I亚基,通过人和裂殖酵母在酿酒酵母中的同源异种互补,在功能上是保守的。RPA49的缺失导致核仁结构的消失,但核仁组装可以通过将核糖体基因拷贝数从190减少到25来恢复。对没有Rpa49的Miller分布的统计分析表明,每个基因的Pol I负载率下降了四倍,相邻Pol I复合体之间的接触减少。因此,Rpa34和Rpa49Pol I特异性亚基对于核仁组装和与相邻酶频繁接触相关的高聚合酶负载率是必不可少的。总之,我们的数据表明,局部的rRNA生产导致空间受限的rRNA生产,这是核仁组装的工具。
The Pol I subunits Rpa34 and Rpa49, required for elongation and 35S rRNA production, promote clustering of neighboring Pol I complexes to enhance the rRNA gene transcription cycle. RNA polymerase I (Pol I) produces large ribosomal RNAs (rRNAs). In this study, we show that the Rpa49 and Rpa34 Pol I subunits, which do not have counterparts in Pol II and Pol III complexes, are functionally conserved using heterospecific complementation of the human and Schizosaccharomyces pombe orthologues in Saccharomyces cerevisiae. Deletion of RPA49 leads to the disappearance of nucleolar structure, but nucleolar assembly can be restored by decreasing ribosomal gene copy number from 190 to 25. Statistical analysis of Miller spreads in the absence of Rpa49 demonstrates a fourfold decrease in Pol I loading rate per gene and decreased contact between adjacent Pol I complexes. Therefore, the Rpa34 and Rpa49 Pol I–specific subunits are essential for nucleolar assembly and for the high polymerase loading rate associated with frequent contact between adjacent enzymes. Together our data suggest that localized rRNA production results in spatially constrained rRNA production, which is instrumental for nucleolar assembly.
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