Tudor-domain protein PHF20L1 reads lysine methylated retinoblastoma tumour suppressor protein.

Tudor-domain protein PHF20L1 reads lysine methylated retinoblastoma tumour suppressor protein.
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DOI:
10.1038/cdd.2017.135
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发表时间:
2017-12
影响因子:
12.4
通讯作者:
La Thangue NB
La Thangue NB
中科院分区:
生物学1区
文献类型:
--
作者:
Carr SM;Munro S;Sagum CA;Fedorov O;Bedford MT;La Thangue NB

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视网膜母细胞瘤肿瘤抑制蛋白(PRB)典型的功能是调节早期细胞周期进程,在那里它执行一些检查点以响应细胞应激和DNA损伤。赖氨酸(K)810的甲基化发生在关键的CDK磷酸化位点,并拮抗邻近S807残基上依赖CDK的磷酸化事件,使pRb处于低磷酸化的生长抑制状态。这在一定程度上是通过将阅读器蛋白53BP1募集到二甲基化的K810中来实现的,这使得PRB的活性能够有效地与DNA损伤反应相结合。在这里,我们报告了一个令人惊讶的观察结果,即在K810处发生了额外的甲基化依赖的相互作用,但不是二甲基标记,它对单甲基K810标记是选择性的。单甲基PHF20L1阅读器与甲基化的pRB结合发生在E2F靶基因上,它通过将MOF乙酰基转移酶复合体招募到E2F靶基因来介导额外的控制水平。值得注意的是,我们发现PHF20L1和单甲基pRb之间的相互作用对于维持pRb依赖的G1-S期检查点的完整性是重要的。我们的结果强调了甲基赖氨酸阅读器在调节PRB的生物活性中具有不同的作用。
The retinoblastoma tumour suppressor protein (pRb) classically functions to regulate early cell cycle progression where it acts to enforce a number of checkpoints in response to cellular stress and DNA damage. Methylation at lysine (K) 810, which occurs within a critical CDK phosphorylation site and antagonises a CDK-dependent phosphorylation event at the neighbouring S807 residue, acts to hold pRb in the hypo-phosphorylated growth-suppressing state. This is mediated in part by the recruitment of the reader protein 53BP1 to di-methylated K810, which allows pRb activity to be effectively integrated with the DNA damage response. Here, we report the surprising observation that an additional methylation-dependent interaction occurs at K810, but rather than the di-methyl mark, it is selective for the mono-methyl K810 mark. Binding of the mono-methyl PHF20L1 reader to methylated pRb occurs on E2F target genes, where it acts to mediate an additional level of control by recruiting the MOF acetyltransferase complex to E2F target genes. Significantly, we find that the interplay between PHF20L1 and mono-methyl pRb is important for maintaining the integrity of a pRb-dependent G1–S-phase checkpoint. Our results highlight the distinct roles that methyl-lysine readers have in regulating the biological activity of pRb.
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