Telomerase subunit Est2 marks internal sites that are prone to accumulate DNA damage.

Telomerase subunit Est2 marks internal sites that are prone to accumulate DNA damage.
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DOI:
10.1186/s12915-021-01167-1
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发表时间:
2021-11-20
期刊:
影响因子:
5.4
通讯作者:
Paeschke K
Paeschke K
中科院分区:
生物学2区
文献类型:
--
作者:
Pandey S;Hajikazemi M;Zacheja T;Schalbetter S;Neale MJ;Baxter J;Guryev V;Hofmann A;Heermann DW;Juranek SA;Paeschke K

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端粒酶的主要功能是在端粒,但在不利的条件下,端粒酶可以结合到内部区域,造成有害的影响,如在癌细胞中观察到的。通过绘制端粒酶催化亚基(Est 2)在芽殖酵母酿酒酵母中的全球占有率,我们揭示了它结合到多个富含鸟嘌呤的基因组位点,我们称之为“非端粒结合位点”(NTBS)。我们表征了Est 2与NTBS的结合。与端粒相反,Est 2在G1和G2期独立于Est 1和Est 3与NTBS结合。Est 1和Est 3的缺失使得端粒酶在NTBS处失活。然而,在整体DNA损伤时,Est 1和Est 3在NTBS处加入Est 2,并且可以观察到端粒添加,表明Est 2占据将NTBS区域标记为基因组稳定性的特定风险。我们的研究结果提供了一个新的模型端粒酶调控的细胞周期中使用内部区域作为“停车点”的EST 2,但标记为热点端粒添加。在线版本包含补充材料,可通过10.1186/s12915-021-01167-1获得。
The main function of telomerase is at the telomeres but under adverse conditions telomerase can bind to internal regions causing deleterious effects as observed in cancer cells. By mapping the global occupancy of the catalytic subunit of telomerase (Est2) in the budding yeast Saccharomyces cerevisiae, we reveal that it binds to multiple guanine-rich genomic loci, which we termed “non-telomeric binding sites” (NTBS). We characterize Est2 binding to NTBS. Contrary to telomeres, Est2 binds to NTBS in G1 and G2 phase independently of Est1 and Est3. The absence of Est1 and Est3 renders telomerase inactive at NTBS. However, upon global DNA damage, Est1 and Est3 join Est2 at NTBS and telomere addition can be observed indicating that Est2 occupancy marks NTBS regions as particular risks for genome stability. Our results provide a novel model of telomerase regulation in the cell cycle using internal regions as “parking spots” of Est2 but marking them as hotspots for telomere addition. The online version contains supplementary material available at 10.1186/s12915-021-01167-1.
酵母端粒酶招募到端粒的结构见解。
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