Contributions of the TEL-patch amino acid cluster on TPP1 to telomeric DNA synthesis by human telomerase.

Contributions of the TEL-patch amino acid cluster on TPP1 to telomeric DNA synthesis by human telomerase.
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通过人端粒酶对TPP1氨基酸簇在TPP1上的贡献。

DOI:
10.1016/j.jmb.2015.01.008
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发表时间:
2015-03-27
影响因子:
5.6
通讯作者:
Cech TR
Cech TR
中科院分区:
生物学2区
文献类型:
--
作者:
Dalby AB;Hofr C;Cech TR

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端粒维持是一个高度协调的过程,其失调与癌症以及端粒缩短综合征有关。最近的研究表明,TEL-补丁-一簇氨基酸的表面上的shelterin组件TPP 1-是必要的端粒酶的招聘到端粒在人类细胞。然而,只有基本的生物化学分析TPP 1在端粒酶募集过程中的作用。在这里,我们开发了一种体外测定来定量测量TEL-补丁对端粒酶募集-结合和第一端粒重复序列延伸的贡献。我们还表明,TEL补丁有助于端粒酶反应的易位步骤。最后,我们的定量观察表明,TEL补丁稳定端粒酶和端粒DNA底物之间的关联,提供了一个分子解释其贡献端粒酶的招聘和行动。
Telomere maintenance is a highly coordinated process, and its misregulation is linked to cancer as well as telomere-shortening syndromes. Recent studies have shown that the TEL-patch – a cluster of amino acids on the surface of the shelterin component TPP1 – is necessary for the recruitment of telomerase to the telomere in human cells. However, there has been only basic biochemical analysis of the role of TPP1 in the telomerase recruitment process. Here we develop an in vitro assay to quantitatively measure the contribution of the TEL-patch to telomerase recruitment – binding and extension of the first telomeric repeat. We also demonstrate that the TEL-patch contributes to the translocation step of the telomerase reaction. Finally, our quantitative observations indicate that the TEL-patch stabilizes the association between telomerase and telomeric DNA substrates, providing a molecular explanation for its contributions to telomerase recruitment and action.
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发表时间: 2011-11-20
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