DNA repair factor APLF is a histone chaperone.

DNA repair factor APLF is a histone chaperone.
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DOI:
10.1016/j.molcel.2010.12.008
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发表时间:
2011-01-07
期刊:
影响因子:
16
通讯作者:
Ahel I
Ahel I
中科院分区:
生物学1区
文献类型:
--
作者:
Mehrotra PV;Ahel D;Ryan DP;Weston R;Wiechens N;Kraehenbuehl R;Owen-Hughes T;Ahel I

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聚(ADP-核糖基)化在DNA修复中起着重要作用,其中它调节染色质松弛作为修复过程中的关键事件之一。然而,聚(ADP-核糖)调节染色质的分子机制仍然知之甚少。在这里,我们确定聚(ADP-核糖)调节蛋白APLF作为DNA损伤特异性组蛋白伴侣。APLF通过其C-末端酸性基序优先结合组蛋白H3/H4四聚体,该基序与NAP 1 L家族的组蛋白伴侣中保守的基序(NAP 1 L基序)同源。我们进一步证明,APLF表现出组蛋白伴侣活性的方式,是依赖于其酸性结构域和NAP 1 L基序是至关重要的APLF在体内的修复能力。最后,我们确定了结构类似物的APLF在低等真核生物的能力,结合组蛋白和本地化的DNA损伤诱导的聚(ADP-核糖基)化的网站。总的来说,这些发现定义了组蛋白伴侣参与聚(ADP-核糖)调节的DNA修复反应。
Poly(ADP-ribosyl)ation plays a major role in DNA repair, where it regulates chromatin relaxation as one of the critical events in the repair process. However, the molecular mechanism by which poly(ADP-ribose) modulates chromatin remains poorly understood. Here we identify the poly(ADP-ribose)-regulated protein APLF as a DNA damage-specific histone chaperone. APLF preferentially binds to the histone H3/H4 tetramer via its C-terminal acidic motif, which is homologous to the motif conserved in the histone chaperones of the NAP1L family (NAP1L motif). We further demonstrate that APLF exhibits histone chaperone activities in a manner that is dependent on its acidic domain and that the NAP1L motif is critical for the repair capacity of APLF in vivo. Finally, we identify structural analogues of APLF in lower eukaryotes with the ability to bind histones and localize to the sites of DNA-damage-induced poly(ADP-ribosyl)ation. Collectively, these findings define the involvement of histone chaperones in poly(ADP-ribose)-regulated DNA repair reactions.
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