HPF1 remodels the active site of PARP1 to enable the serine ADP-ribosylation of histones.

HPF1 remodels the active site of PARP1 to enable the serine ADP-ribosylation of histones.
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HPF1 重塑 PARP1 的活性位点,以实现组蛋白的丝氨酸 ADP 核糖基化。

DOI:
10.1038/s41467-021-21302-4
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发表时间:
2021-02-15
影响因子:
16.6
通讯作者:
Yun CH
Yun CH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Sun FH;Zhao P;Zhang N;Kong LL;Wong CCL;Yun CH

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在与DNA断裂结合后,聚(ADP-核糖)聚合酶1(PARP 1)ADP-核糖基化自身和其他因子以启动DNA修复。丝氨酸是DNA损伤后ADP-核糖基化的主要残基,这严格依赖于HPF 1。本文报道了人HPF 1/PARP 1-CAT ΔHD复合物的晶体结构,分辨率为1.98 nm,小鼠和人HPF 1的晶体结构分别为1.71 nm和1.57 nm。我们的结构和诱变数据证实了Suskiewicz等人在最近的HPF 1/PARP 2研究中获得的结构见解适用于PARP 1。此外,我们定量表征HPF 1/PARP 1结合所需的关键残基。我们的数据表明,通过盐桥Glu 284/Asp 286,Arg 239的位置Glu 284催化丝氨酸ADP-核糖基化,保持HPF 1的局部构象,以限制PARP 1的自修饰,并促进HPF 1/PARP 1的结合,通过中和Glu 284的负电荷。这些发现,沿着高分辨率结构数据,可能有助于靶向PARP 1的药物发现。一旦DNA断裂发生,聚(ADP-核糖)聚合酶1(PARP 1)ADP-核糖基化本身和其他DNA修复因子启动修复过程。在这里,作者解析了小鼠和人类HPF 1的晶体结构,以及人类HPF 1/PARP 1复合物,证明了对PARP 1调控的见解。
Upon binding to DNA breaks, poly(ADP-ribose) polymerase 1 (PARP1) ADP-ribosylates itself and other factors to initiate DNA repair. Serine is the major residue for ADP-ribosylation upon DNA damage, which strictly depends on HPF1. Here, we report the crystal structures of human HPF1/PARP1-CAT ΔHD complex at 1.98 Å resolution, and mouse and human HPF1 at 1.71 Å and 1.57 Å resolution, respectively. Our structures and mutagenesis data confirm that the structural insights obtained in a recent HPF1/PARP2 study by Suskiewicz et al. apply to PARP1. Moreover, we quantitatively characterize the key residues necessary for HPF1/PARP1 binding. Our data show that through salt-bridging to Glu284/Asp286, Arg239 positions Glu284 to catalyze serine ADP-ribosylation, maintains the local conformation of HPF1 to limit PARP1 automodification, and facilitates HPF1/PARP1 binding by neutralizing the negative charge of Glu284. These findings, along with the high-resolution structural data, may facilitate drug discovery targeting PARP1. Once DNA breaks occur, poly(ADP-ribose) polymerase 1 (PARP1) ADP-ribosylates itself and other DNA repair factors to initiate the repair process. Here, the authors resolve the crystal structures of mouse and human HPF1, and human HPF1/PARP1 complex proving insights into PARP1 regulation.
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