A bridging model for persistence of a polycomb group protein complex through DNA replication in vitro.

A bridging model for persistence of a polycomb group protein complex through DNA replication in vitro.
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DOI:
10.1016/j.molcel.2012.05.038
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发表时间:
2012-06-29
期刊:
影响因子:
16
通讯作者:
Francis, Nicole J.
Francis, Nicole J.
中科院分区:
生物学1区
文献类型:
--
作者:
Lo, Stanley M.;Follmer, Nicole E.;Lengsfeld, Bettina M.;Madamba, Egbert V.;Seong, Samuel;Grau, Daniel J.;Francis, Nicole J.

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表观遗传调控可能涉及可遗传的染色质状态,但染色质特征如何通过DNA复制遗传还不完全清楚。我们使用染色质的无细胞复制来解决这个问题。以前,我们表明,Polycomb组复合物,PRC 1,通过DNA复制与染色质保持连续相关。在这里,我们研究的持久性的机制。我们发现,一个单一的PRC 1亚基,后性梳(PSC)可以通过DNA复制重建持久性。PSC结合核小体并自我相互作用,将核小体桥接成稳定的寡聚体结构。在这些结构中,单个PSC-染色质接触是动态的。PSC与染色质的稳定缔合,包括通过DNA复制,取决于PSC-PSC相互作用。我们的数据表明,不稳定的个体PSC-染色质接触允许DNA复制机制通过,而PSC-PSC相互作用阻止PSC解离,使其重新结合到复制的染色质上。这种机制可能允许通过DNA复制遗传包括PRC 1在内的染色质蛋白以维持染色质状态。
Epigenetic regulation may involve heritable chromatin states but how chromatin features can be inherited through DNA replication is incompletely understood. We address this question using cell free replication of chromatin. Previously, we showed that a Polycomb Group complex, PRC1, remains continuously associated with chromatin through DNA replication. Here we investigate the mechanism of persistence. We find that a single PRC1 subunit, Posterior Sex Combs (PSC) can reconstitute persistence through DNA replication. PSC binds nucleosomes and self-interacts, bridging nucleosomes into a stable, oligomeric structure. Within these structures, individual PSC-chromatin contacts are dynamic. Stable association of PSC with chromatin, including through DNA replication, depends on PSC-PSC interactions. Our data suggest labile individual PSC-chromatin contacts allow passage of the DNA replication machinery while PSC-PSC interactions prevent PSC from dissociating, allowing it to rebind to replicated chromatin. This mechanism may allow inheritance of chromatin proteins including PRC1 through DNA replication to maintain chromatin states.
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