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首页> 外文期刊>Cell cycle >Identification of toposome, a novel multisubunit complex containing topoisomerase IIalpha.
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Identification of toposome, a novel multisubunit complex containing topoisomerase IIalpha.

机译:拓扑体的鉴定,一种新型的含有拓扑异构酶IIalpha的多亚基复合体。

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Topoisomerase IIalpha plays essential roles in chromosome segregation. However, it is not well understood how topoisomerase IIalpha exerts its function during mitosis. In this report, we find that topoisomerase IIalpha forms a multisubunit complex, named toposome, containing two ATPase/helicase proteins (RNA helicase A and RHII/Gu), one serine/threonine protein kinase (SRPK1), one HMG protein (SSRP1), and two pre-mRNA splicing factors (PRP8 and hnRNP C). Toposome separates entangled circular chromatin DNA about fourfold more efficiently than topoisomerase IIalpha. Interestingly, this decatenation reaction yields knotted circles, which are not seen in reactions provided with monomeric circular DNA. Our results also show that interaction among toposome-associated proteins is highest in G2/M phase but drastically diminishes in G1/S phase. These results suggest that toposome is a dynamic complex whose assembly or activation is subject to cell cycle regulation.
机译:拓扑异构酶IIalpha在染色体分离中起重要作用。但是,尚不清楚拓扑异构酶IIα在有丝分裂过程中如何发挥其功能。在此报告中,我们发现拓扑异构酶IIalpha形成了一个多亚基复合物,称为拓扑体,包含两个ATPase /解旋酶蛋白(RNA解旋酶A和RHII / Gu),一个丝氨酸/苏氨酸蛋白激酶(SRPK1),一个HMG蛋白(SSRP1),和两个前mRNA剪接因子(PRP8和hnRNP C)。与拓扑异构酶IIalpha相比,拓扑异构体更有效地分离纠缠的环状染色质DNA约四倍。有趣的是,这种脱级反应会产生打结的圆,这在带有单体环状DNA的反应中是看不到的。我们的结果还表明,与拓扑体相关的蛋白质之间的相互作用在G2 / M期最高,而在G1 / S期则大大降低。这些结果表明,拓扑结构是一种动态复合体,其组装或激活受细胞周期调控。

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