RPS27a and RPL40, Which Are Produced as Ubiquitin Fusion Proteins, Are Not Essential for p53 Signalling.

RPS27a and RPL40, Which Are Produced as Ubiquitin Fusion Proteins, Are Not Essential for p53 Signalling.
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DOI:
10.3390/biom13060898
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发表时间:
2023-05-28
期刊:
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
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四个人泛素编码基因中的两个表达泛素作为N-末端融合前体多肽,在C-末端具有核糖体蛋白(RP)RPS 27 a或RPL 40。RPS 27 a和RPL 40被认为是重要的诱导肿瘤抑制p53在核糖体生物合成的缺陷,这表明它们可能在协调核糖体的生产,泛素水平和p53信号。在这里,我们报告说,RPS 27 a是从泛素-RP前体切割的过程中,出现独立的核糖体生物合成。与其他RP相反,RPS 27 a或RPL 40的敲低并不稳定U2 OS细胞中的肿瘤抑制因子p53。敲除蛋白质都没有阻止p53的稳定后,抑制核糖体生物合成放线菌素D,表明他们不需要在这些细胞中的p53信号。然而,MCF 7和LNCaP细胞中RPS 27 a和RPL 40的敲低强烈诱导p53,与大多数其他RP的观察结果一致。重要的是,在所有测试的细胞系中,RPS 27 a和RPL 40是rRNA产生所需的。我们的数据表明,RPS 27 a和RPL 40在p53信号传导中的作用,但不是它们在核糖体生物合成中的重要性,在细胞类型之间是不同的。
Two of the four human ubiquitin-encoding genes express ubiquitin as an N-terminal fusion precursor polypeptide, with either ribosomal protein (RP) RPS27a or RPL40 at the C-terminus. RPS27a and RPL40 have been proposed to be important for the induction of the tumour suppressor p53 in response to defects in ribosome biogenesis, suggesting that they may play a role in the coordination of ribosome production, ubiquitin levels and p53 signalling. Here, we report that RPS27a is cleaved from the ubiquitin-RP precursor in a process that appears independent of ribosome biogenesis. In contrast to other RPs, the knockdown of either RPS27a or RPL40 did not stabilise the tumour suppressor p53 in U2OS cells. Knockdown of neither protein blocked p53 stabilisation following inhibition of ribosome biogenesis by actinomycin D, indicating that they are not needed for p53 signalling in these cells. However, the knockdown of both RPS27a and RPL40 in MCF7 and LNCaP cells robustly induced p53, consistent with observations made with the majority of other RPs. Importantly, RPS27a and RPL40 are needed for rRNA production in all cell lines tested. Our data suggest that the role of RPS27a and RPL40 in p53 signalling, but not their importance in ribosome biogenesis, differs between cell types.
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