Regulation of pluripotency and cellular reprogramming by the ubiquitin-proteasome system.

Regulation of pluripotency and cellular reprogramming by the ubiquitin-proteasome system.
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DOI:
10.1016/j.stem.2012.09.011
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发表时间:
2012-12-07
期刊:
影响因子:
23.9
通讯作者:
Aifantis, Iannis
Aifantis, Iannis
中科院分区:
医学1区
文献类型:
--
作者:
Buckley, Shannon M.;Aranda-Orgilles, Beatriz;Strikoudis, Alexandros;Apostolou, Effie;Loizou, Evangelia;Moran-Crusio, Kelly;Farnsworth, Charles L.;Koller, Antonius A.;Dasgupta, Ramanuj;Silva, Jeffrey C.;Stadtfeld, Matthias;Hochedlinger, Konrad;Chen, Emily I.;Aifantis, Iannis

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虽然干细胞多能性和分化的转录调控已被广泛研究,但只有少数研究解决了翻译后修饰在这些过程中的作用。翻译后修饰的一个关键机制是泛素-蛋白酶体系统(UPS)的泛素化。在这里,我们地图,使用鸟枪蛋白质组学,在ES细胞分化和诱导多能性的泛素化蛋白景观。此外,使用UPS靶向RNAi筛选,我们确定了多能性和分化的新调节剂。我们专注于这些蛋白质中的两个,去泛素化酶,Psmd 14,和E3连接酶,Fbxw 7,并表征其在ES细胞多能性和细胞重编程的重要性。这是UPS作为干细胞多能性关键调节因子的首次全球性表征,为未来专注于特定UPS酶或泛素化底物的研究开辟了道路。
While transcriptional regulation of stem cell pluripotency and differentiation has been extensively studied, only a small number of studies have addressed the roles for post-translational modifications in these processes. A key mechanism of post-translational modification is ubiquitination by the ubiquitin-proteasome system (UPS). Here we map, using shotgun proteomics, the ubiquitinated protein landscape during ES cell differentiation and induced pluripotency. Moreover, using UPS-targeted RNAi screens, we identify novel regulators of pluripotency and differentiation. We focus on two of these proteins, the deubiquitinating enzyme, Psmd14, and the E3 ligase, Fbxw7, and characterize their importance in ES cell pluripotency and cellular reprogramming. This is the first global characterization of the UPS as a key regulator of stem cell pluripotency, opening the way for future studies that focus on specific UPS enzymes or ubiquitinated substrates.
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