Phase transition and remodeling complex assembly are important for SS18-SSX oncogenic activity in synovial sarcomas.

Phase transition and remodeling complex assembly are important for SS18-SSX oncogenic activity in synovial sarcomas.
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相变和重塑复合物组装对于滑膜肉瘤中 SS18-SSX 致癌活性很重要

DOI:
10.1038/s41467-022-30447-9
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发表时间:
2022-05-18
影响因子:
16.6
通讯作者:
Long J
Long J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Cheng Y;Shen Z;Gao Y;Chen F;Xu H;Mo Q;Chu X;Peng CL;McKenzie TT;Palacios BE;Hu J;Zhou H;Long J

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癌蛋白 SS18-SSX 是滑膜肉瘤的标志。然而,作为SS18-SSX融合蛋白的一部分,SS18的功能仍不清楚。在这里,我们描述了人类 SS18/BRG1 和酵母 SNF11/SNF2 子复合物的结构。两个亚复合物组装成具有相似构象的异二聚体,表明 SNF11 可能是染色质重塑复合物中 SS18 的同源物。重要的是,我们的研究表明,本质上无序的区域(QPGY 结构域)的自缔合导致 SS18 或 SS18-SSX 的液-液相分离(LLPS),并随后将 BRG1 招募到相分离的冷凝物中。此外,我们的结果表明QPGY结构域中的酪氨酸残基在SS18或SS18-SSX的LLPS中起决定性作用。 SS18-SSX LLPS 或 SS18-SSX 与 BRG1 结合的干扰会损害 SS18-SSX 对 NIH3T3 细胞的转化。我们的数据表明,LLPS 和组装成染色质重塑剂都有助于 SS18-SSX 在滑膜肉瘤中的致癌活性。癌蛋白 SS18-SSX 是滑膜肉瘤的标志。作者在此报告称,SS18-SSX 的相分离以及 SS18-SSX 与染色质重塑复合物的结合对于癌蛋白 SS18-SSX 的转化活性非常重要。
Oncoprotein SS18-SSX is a hallmark of synovial sarcomas. However, as a part of the SS18-SSX fusion protein, SS18’s function remains unclear. Here, we depict the structures of both human SS18/BRG1 and yeast SNF11/SNF2 subcomplexes. Both subcomplexes assemble into heterodimers that share a similar conformation, suggesting that SNF11 might be a homologue of SS18 in chromatin remodeling complexes. Importantly, our study shows that the self-association of the intrinsically disordered region, QPGY domain, leads to liquid-liquid phase separation (LLPS) of SS18 or SS18-SSX and the subsequent recruitment of BRG1 into phase-separated condensates. Moreover, our results show that the tyrosine residues in the QPGY domain play a decisive role in the LLPS of SS18 or SS18-SSX. Perturbations of either SS18-SSX LLPS or SS18-SSX’s binding to BRG1 impair NIH3T3 cell transformation by SS18-SSX. Our data demonstrate that both LLPS and assembling into chromatin remodelers contribute to the oncogenic activity of SS18-SSX in synovial sarcomas. Oncoprotein SS18-SSX is a hallmark of synovial sarcoma. Here the authors report phase separation of SS18-SSX and the binding of SS18-SSX to chromatin remodeling complex are important for the transformation activity of the oncoprotein SS18-SSX.
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