Polycomb group targeting through different binding partners of RING1B C-terminal domain.

Polycomb group targeting through different binding partners of RING1B C-terminal domain.
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DOI:
10.1016/j.str.2010.04.013
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发表时间:
2010-08-11
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Kim CA
Kim CA
中科院分区:
其他
文献类型:
--
作者:
Wang R;Taylor AB;Leal BZ;Chadwell LV;Ilangovan U;Robinson AK;Schirf V;Hart PJ;Lafer EM;Demeler B;Hinck AP;McEwen DG;Kim CA

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RING1B是一种Polycomb Group (PcG)蛋白,它通过与另一种PcG蛋白Polycomb (Pc)结合而结合甲基化的染色质。然而,RING1B可以与非甲基化的染色质结合,这表明RING1B与染色质相互作用的另一种机制。在这里,我们证明了两个蛋白之间几乎没有序列一致性,Pc cbox结构域和RYBP,结合在RING1B的c端结构域的同一表面(C-RING1B)。pccbox和RYBP各自折叠成几乎相同的分子间β薄片,其中C-RING1B和环结构在两种蛋白质中完全不同。β片和环都是稳定结合和转录抑制所必需的。此外,一种破坏果蝇dRING1蛋白结合的突变在体内阻止了染色质结合和PcG功能。这些结果表明,PcG靶向不同染色质位置部分依赖于C-RING1B在序列和结构上不同的结合伙伴。
RING1B, a Polycomb Group (PcG) protein, binds methylated chromatin through its association with another PcG protein called Polycomb (Pc). However, RING1B can associate with nonmethylated chromatin suggesting an alternate mechanism for RING1B interaction with chromatin. Here, we demonstrate that two proteins with little sequence identity between them, the Pc cbox domain and RYBP, bind the same surface on the C-terminal domain of RING1B (C-RING1B). Pc cbox and RYBP each fold into a nearly identical, intermolecular beta sheet with C-RING1B and a loop structure which are completely different in the two proteins. Both the beta sheet and loop are required for stable binding and transcription repression. Further, a mutation engineered to disrupt binding on the Drosophila dRING1 protein prevents chromatin association and PcG function in vivo. These results suggest that PcG targeting to different chromatin locations relies, in part, on binding partners of C-RING1B that are diverse in sequence and structure.
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