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
中科院分区:
文献类型:
--
作者:
Gao, Zhonghua;Zhang, Jin;Bonasio, Roberto;Strino, Francesco;Sawai, Ayana;Parisi, Fabio;Kluger, Yuval;Reinberg, Danny
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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