DEAD-box helicases modulate dicing body formation in Arabidopsis.

DEAD-box helicases modulate dicing body formation in Arabidopsis.
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DEAD-box解旋酶调节拟南芥切块体的形成

DOI:
10.1126/sciadv.abc6266
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Zhang X
Zhang X
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Li Q;Liu N;Liu Q;Zheng X;Lu L;Gao W;Liu Y;Liu Y;Zhang S;Wang Q;Pan J;Chen C;Mi Y;Yang M;Cheng X;Ren G;Yuan YW;Zhang X

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RH6、RH8和RH12是之前未被发现的d -小体成分,它们通过llps驱动d -小体的形成。真核细胞含有许多由蛋白质和核酸液滴组成的无膜细胞器,并提供各种细胞过程的时空控制。然而,这些细胞器的形成和快速应力诱导的改变的分子机制是相对未知的。本文研究了DEAD-box解旋酶在拟南芥无膜核切割体(d - body)形成和改变中的作用。我们发现RNA解旋酶6 (RH6)、RH8和RH12是以前未被识别的d体成分。这些解旋酶与d-小体的关键组分SERRATE相互作用并促进其相分离,并通过液-液相分离(llps)驱动d-小体的形成。这些解旋酶的积累在萝卜花叶病毒感染后减少,这与d体的减少有关。因此,我们的研究结果揭示了RH6、RH8和RH12在通过llps调节D-body形成中的关键作用。
RH6, RH8, and RH12 are previously unidentified D-body components and drive the formation of D-bodies through LLPSs. Eukaryotic cells contain numerous membraneless organelles that are made from liquid droplets of proteins and nucleic acids and that provide spatiotemporal control of various cellular processes. However, the molecular mechanisms underlying the formation and rapid stress-induced alterations of these organelles are relatively uncharacterized. Here, we investigated the roles of DEAD-box helicases in the formation and alteration of membraneless nuclear dicing bodies (D-bodies) in Arabidopsis thaliana. We uncovered that RNA helicase 6 (RH6), RH8, and RH12 are previously unidentified D-body components. These helicases interact with and promote the phase separation of SERRATE, a key component of D-bodies, and drive the formation of D-bodies through liquid-liquid phase separations (LLPSs). The accumulation of these helicases in the nuclei decreases upon Turnip mosaic virus infections, which couples with the decrease of D-bodies. Our results thus reveal the key roles of RH6, RH8, and RH12 in modulating D-body formation via LLPSs.
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