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中体相关 mRNA 在调节胞质分裂中的作用。

The role of midbody-associated mRNAs in regulating abscission.

机构信息

Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.

Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.

出版信息

J Cell Biol. 2023 Dec 4;222(12). doi: 10.1083/jcb.202306123. Epub 2023 Nov 3.

Abstract

Midbodies function during telophase to regulate the abscission step of cytokinesis. Until recently, it was thought that abscission-regulating proteins, such as ESCRT-III complex subunits, accumulate at the MB by directly or indirectly binding to the MB resident protein, CEP55. However, recent studies have shown that depletion of CEP55 does not fully block ESCRT-III targeting the MB. Here, we show that MBs contain mRNAs and that these MB-associated mRNAs can be locally translated, resulting in the accumulation of abscission-regulating proteins. We demonstrate that localized MB-associated translation of CHMP4B is required for its targeting to the abscission site and that 3' UTR-dependent CHMP4B mRNA targeting to the MB is required for successful completion of cytokinesis. Finally, we identify regulatory cis-elements within RNAs that are necessary and sufficient for mRNA trafficking to the MB. We propose a novel method of regulating cytokinesis and abscission by MB-associated targeting and localized translation of selective mRNAs.

摘要

中介体在胞质分裂的末期发挥作用,以调节胞质分裂的分离步骤。直到最近,人们还认为,分离调节蛋白,如 ESCRT-III 复合物亚基,通过直接或间接与驻留于中介体的蛋白 CEP55 结合而在中介体上积累。然而,最近的研究表明,CEP55 的耗竭并不能完全阻止 ESCRT-III 靶向中介体。在这里,我们表明中介体包含 mRNA,并且这些与中介体相关的 mRNA 可以进行局部翻译,导致分离调节蛋白的积累。我们证明,CHMP4B 的局部中介体相关翻译对于其靶向到分离位点是必需的,并且 3'UTR 依赖性的 CHMP4B mRNA 靶向到中介体对于成功完成胞质分裂是必需的。最后,我们鉴定了在 RNA 中对于 mRNA 向中介体运输是必要和充分的调节顺式元件。我们提出了一种通过中介体相关靶向和选择性 mRNA 的局部翻译来调节胞质分裂和分离的新方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7043/10624257/c00a702f9e73/JCB_202306123_Fig1.jpg

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