PCGF homologs, CBX proteins, and RYBP define functionally distinct PRC1 family complexes.

PCGF homologs, CBX proteins, and RYBP define functionally distinct PRC1 family complexes.
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DOI:
10.1016/j.molcel.2012.01.002
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发表时间:
2012-02-10
期刊:
影响因子:
16
通讯作者:
Reinberg, Danny
Reinberg, Danny
中科院分区:
生物学1区
文献类型:
--
作者:
Gao, Zhonghua;Zhang, Jin;Bonasio, Roberto;Strino, Francesco;Sawai, Ayana;Parisi, Fabio;Kluger, Yuval;Reinberg, Danny

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哺乳动物PRC 1复合物的异质性阻碍了我们对其生物学功能的理解。在这里,我们提出了一个全面的蛋白质组学和基因组学分析,发现六个主要的PRC 1复合物,每个包含一个独特的PCGF亚基,RING 1A/B泛素连接酶,和一组独特的相关多肽。这些PRC 1复合物在它们的基因组定位上不同,并且只有一小部分与H3 K27 me 3共定位。进一步的生物化学分析显示,六种PCGF-RING 1A/B组合通过与RYBP或其同源物YAF 2缔合形成多个复合物,这阻止了其他典型PRC 1亚基如CBX、PHC和SCM的掺入。虽然RYBP/YAF 2和CBX/PHC/SCM复合物都能使染色质致密,但只有RYBP能刺激RING 1B对H2 AK 119 ub 1的活性,这表明RING 1B在PRC 1功能中起着重要作用。ES细胞中RYBP的敲低损害了它们形成胚状体的能力,可能是因为细胞增殖和H2 AK 119 ub 1水平维持的缺陷。
The heterogeneous nature of mammalian PRC1 complexes has hindered our understanding of their biological functions. Here, we present a comprehensive proteomic and genomic analysis that uncovered six major groups of PRC1 complexes each containing a distinct PCGF subunit, a RING1A/B ubiquitin ligase, and a unique set of associated polypeptides. These PRC1 complexes differ in their genomic localization and only a small subset co-localize with H3K27me3. Further biochemical dissection revealed that the six PCGF-RING1A/B combinations form multiple complexes through association with RYBP or its homolog YAF2, which prevents the incorporation of other canonical PRC1 subunits such as CBX, PHC and SCM. Although both RYBP/YAF2- and CBX/PHC/SCM-containing complexes compact chromatin, only RYBP stimulates the activity of RING1B toward H2AK119ub1, suggesting a central role in PRC1 function. Knockdown of RYBP in ES cells compromised their ability to form embryoid bodies, likely because of defects in cell proliferation and maintenance of H2AK119ub1 level.
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