53BP1-ACLY-SLBP-coordinated activation of replication-dependent histone biogenesis maintains genomic integrity.

53BP1-ACLY-SLBP-coordinated activation of replication-dependent histone biogenesis maintains genomic integrity.
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DOI:
10.1093/nar/gkab1300
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发表时间:
2022-02-22
影响因子:
14.9
通讯作者:
You HJ
You HJ
中科院分区:
生物学2区
文献类型:
--
作者:
Wu T;Jun S;Choi EJ;Sun J;Yang EB;Lee HS;Kim SY;Fahmi NA;Jiang Q;Zhang W;Yong J;Lee JH;You HJ

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P53结合蛋白1(53BP1)调节DNA双链断裂(DSB)修复途径,维持基因组的完整性。在这里,我们发现53BP1可以作为核苷二磷酸激酶介导的ATP-柠檬酸裂解酶(ACLY)磷酸化的分子支架,从而增强ACLY的活性。这种功能关联对于促进全球组蛋白乙酰化和随后的基因表达的转录组范围的改变至关重要。具体地说,复制依赖的组蛋白生物发生因子-茎环结合蛋白(SLBP)的表达依赖于SLBP启动子上53BP1-ACLY控制的乙酰化。这一由53BP1、ACLY和SLBP执行的调控事件链对于组蛋白的定量和定性生物发生以及基因组完整性的保存都是至关重要的。综上所述,我们的发现揭示了53BP1在协调复制依赖的组蛋白生物发生中的一个先前未知的角色,并强调了DNA修复独立的功能,通过包括ACLY和SLBP在内的调控网络维持基因组的稳定性。
p53-binding protein 1 (53BP1) regulates the DNA double-strand break (DSB) repair pathway and maintains genomic integrity. Here we found that 53BP1 functions as a molecular scaffold for the nucleoside diphosphate kinase-mediated phosphorylation of ATP-citrate lyase (ACLY) which enhances the ACLY activity. This functional association is critical for promoting global histone acetylation and subsequent transcriptome-wide alterations in gene expression. Specifically, expression of a replication-dependent histone biogenesis factor, stem-loop binding protein (SLBP), is dependent upon 53BP1-ACLY-controlled acetylation at the SLBP promoter. This chain of regulation events carried out by 53BP1, ACLY, and SLBP is crucial for both quantitative and qualitative histone biogenesis as well as for the preservation of genomic integrity. Collectively, our findings reveal a previously unknown role for 53BP1 in coordinating replication-dependent histone biogenesis and highlight a DNA repair-independent function in the maintenance of genomic stability through a regulatory network that includes ACLY and SLBP.
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