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首页> 外文期刊>Molecular cell >PCGF Homologs, CBX Proteins, and RYBP Define Functionally Distinct PRC1 Family Complexes
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PCGF Homologs, CBX Proteins, and RYBP Define Functionally Distinct PRC1 Family Complexes

机译:PCGF同源物,CBX蛋白和RYBP定义功能不同的PRC1家族复合物

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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 colocalize 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 embryonic stem cells compromised their ability to form embryoid bodies, likely because of defects in cell proliferation and maintenance of H2AK119ub1 levels.
机译:哺乳动物PRC1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分析,揭示了六个主要的PRC1复合物组,每个复合物包含一个不同的PCGF亚基,一个RING1A / B泛素连接酶和一组独特的相关多肽。这些PRC1复合体的基因组定位不同,只有一小部分与H3K27me3共定位。进一步的生化解剖显示,这6种PCGF-RING1A / B组合通过与RYBP或其同源物YAF2缔合而形成多个复合物,从而阻止了其他规范的PRC1亚基(如CBX,PHC和SCM)的掺入。尽管同时包含RYBP / YAF2-和CBX / PHC / SCM的复合物都可压缩染色质,但只有RYBP可以刺激RING1B对H2AK119ub1的活性,这表明在PRC1功能中起着核心作用。 RYBP在胚胎干细胞中的敲低损害了它们形成类胚体的能力,这可能是由于细胞增殖缺陷和维持H2AK119ub1水平所致。

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