Cryo-EM structure of the human Sirtuin 6-nucleosome complex.

Cryo-EM structure of the human Sirtuin 6-nucleosome complex.
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人类Sirtuin 6-核体复合物的冷冻EM结构。

DOI:
10.1126/sciadv.adf7586
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发表时间:
2023-04-14
期刊:
影响因子:
13.6
通讯作者:
Armache, Jean-Paul
Armache, Jean-Paul
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chio, Un Seng;Rechiche, Othman;Bryll, Alysia R.;Zhu, Jiang;Leith, Erik M.;Feldman, Jessica L.;Peterson, Craig L.;Tan, Song;Armache, Jean-Paul

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Sirtuin 6 (SIRT6)是一种多层面的蛋白质去乙酰化酶/去乙酰化酶,是长寿和癌症小分子调节剂的主要靶点。在染色质的背景下,SIRT6从核小体的组蛋白H3中去除乙酰基,但其核小体底物偏好的分子基础尚不清楚。我们的人类SIRT6与核小体复合物的冷冻电镜结构显示,SIRT6的催化结构域从核小体的入口点撬开DNA并暴露组蛋白H3 n端螺旋,而SIRT6锌结合结构域使用精氨酸锚定与组蛋白酸性斑块结合。此外,SIRT6与组蛋白H2A的c端尾部形成抑制相互作用。该结构提供了SIRT6如何使H3 K9和H3 K56脱乙酰化的见解。SIRT6去乙酰化酶/核小体复合物的结构表明该酶如何作用于组蛋白H3 K9和K56残基。
Sirtuin 6 (SIRT6) is a multifaceted protein deacetylase/deacylase and a major target for small-molecule modulators of longevity and cancer. In the context of chromatin, SIRT6 removes acetyl groups from histone H3 in nucleosomes, but the molecular basis for its nucleosomal substrate preference is unknown. Our cryo–electron microscopy structure of human SIRT6 in complex with the nucleosome shows that the catalytic domain of SIRT6 pries DNA from the nucleosomal entry-exit site and exposes the histone H3 N-terminal helix, while the SIRT6 zinc-binding domain binds to the histone acidic patch using an arginine anchor. In addition, SIRT6 forms an inhibitory interaction with the C-terminal tail of histone H2A. The structure provides insights into how SIRT6 can deacetylate both H3 K9 and H3 K56. The structure of the SIRT6 deacetylase/nucleosome complex suggests how the enzyme acts on both histone H3 K9 and K56 residues.
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