The architecture of Tetrahymena telomerase holoenzyme.

The architecture of Tetrahymena telomerase holoenzyme.
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DOI:
10.1038/nature12062
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发表时间:
2013-04-11
期刊:
影响因子:
64.8
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--
中科院分区:
综合性期刊1区
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端粒酶通过内部RNA模板和专门的端粒酶逆转录酶(TERT)将端粒重复序列添加到染色体末端,从而维持基因组的完整性。在一个具有生物学功能的全酶中,人们对蛋白质和RNA亚基之间的物理关系知之甚少。本文描述了嗜热四膜虫端粒酶全酶的结构。7个蛋白中的6个和端粒酶RNA (TER)的tert结合区已经通过亲和标记定位。与高分辨率结构的拟合揭示了TERT、TER和p65在RNP催化核心中的组织。p50在RNP催化核心、p75-p19-p45亚复合物和dna结合Teb1之间具有意想不到的枢纽作用。一个完整的体外全酶重构赋予了这些相互作用在过程端粒重复合成中的功能。这些研究提供了端粒酶全酶组装和生理功能所必需的亚基关联的广泛网络的第一个观点。
Telomerase adds telomeric repeats to chromosome ends using an internal RNA template and specialized telomerase reverse transcriptase (TERT), thereby maintaining genome integrity. Little is known about the physical relationships among protein and RNA subunits within a biologically functional holoenzyme. Here we describe the architecture of Tetrahymena thermophila telomerase holoenzyme determined by electron microscopy. Six of the 7 proteins and the TERT-binding regions of telomerase RNA (TER) have been localized by affinity labeling. Fitting with high-resolution structures reveals the organization of TERT, TER, and p65 in the RNP catalytic core. p50 has an unanticipated role as a hub between the RNP catalytic core, p75-p19-p45 subcomplex, and the DNA-binding Teb1. A complete in vitro holoenzyme reconstitution assigns function to these interactions in processive telomeric repeat synthesis. These studies provide the first view of the extensive network of subunit associations necessary for telomerase holoenzyme assembly and physiological function.
DOI: 10.1093/nar/gkp1173
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