Human Ku70/80 interacts directly with hTR, the RNA component of human telomerase.

Human Ku70/80 interacts directly with hTR, the RNA component of human telomerase.
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人Ku70/80与人端粒酶的RNA成分HTR直接相互作用。

DOI:
10.1093/nar/gki342
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发表时间:
2005
影响因子:
14.9
通讯作者:
Beattie, TL
Beattie, TL
中科院分区:
生物学2区
文献类型:
--
作者:
Ting, NSY;Yu, YP;Pohorelic, B;Lees-Miller, SP;Beattie, TL

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端粒完整性的维持需要端粒酶、端粒相关蛋白和 DNA 修复蛋白之间的动态相互作用。这些相互作用对于抑制 DNA 损伤反应和染色体动力学变化至关重要,这些变化可能导致非整倍性或其他转化畸变。酿酒酵母中 DNA 修复蛋白 Ku 和端粒酶 (TLC1) 的 RNA 成分之间的相互作用已被证明对于维持端粒长度非常重要。在这里,我们试图确定这种相互作用在高等真核生物中是否保守。尽管 TLC1 和人端粒酶的 RNA 成分 (hTR) 之间没有序列相似性,但我们表明人 Ku70/80 在体外和细胞环境中与 hTR 相互作用。具体来说,Ku70/80 与 hTR 3' 端的 47 nt 区域相互作用,该区域类似于 TLC1 上酵母 Ku70/80 结合结构域的茎环区域。此外,利用免疫沉淀/RT-PCR实验,我们发现Ku在缺乏人端粒酶逆转录酶蛋白(hTERT)的细胞系中与hTR相互作用,表明这种相互作用不需要hTERT。这些数据表明,Ku 与 hTR 直接相互作用,不依赖于 hTERT,为不同物种之间 Ku 和端粒酶 RNA 之间相互作用的保守性提供了证据,并提供了关于 Ku 如何参与高等真核生物端粒维持的重要见解。
Maintenance of telomere integrity requires the dynamic interplay between telomerase, telomere-associated proteins and DNA repair proteins. These interactions are vital to suppress DNA damage responses and changes in chromosome dynamics that can result in aneuploidy or other transforming aberrations. The interaction between the DNA repair protein Ku and the RNA component of telomerase (TLC1) in Saccharomyces cerevisiae has been shown to be important for maintaining telomere length. Here, we sought to determine whether this interaction was conserved in higher eukaryotes. Although there is no sequence similarity between TLC1 and the RNA component (hTR) of human telomerase, we show that human Ku70/80 interacts with hTR both in vitro and in a cellular context. Specifically, Ku70/80 interacts with a 47 nt region of the 3′ end of hTR, which resembles the stem–loop region of the yeast Ku70/80 binding domain on TLC1. Furthermore, utilizing immunoprecipitation/RT–PCR experiments, we show that Ku interacts with hTR in cell lines deficient in the human telomerase reverse transcriptase protein (hTERT), suggesting that this interaction does not require hTERT. These data suggest that Ku interacts directly with hTR, independent of hTERT, providing evidence for the conservation of the interaction between Ku and telomerase RNA among various species and provide significant insight into how Ku is involved in telomere maintenance in higher eukaryotes.
DOI: 10.1016/j.dnarep.2004.03.041
发表时间: 2004-07-02
期刊: DNA REPAIR
影响因子: 3.8
作者:
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发表时间: 2004-07-13
期刊: CURRENT BIOLOGY
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