Muscleblind-like proteins use modular domains to localize RNAs by riding kinesins and docking to membranes.

Muscleblind-like proteins use modular domains to localize RNAs by riding kinesins and docking to membranes.
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DOI:
10.1038/s41467-023-38923-6
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发表时间:
2023-06-09
影响因子:
16.6
通讯作者:
Wang, Eric T.
Wang, Eric T.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hildebrandt, Ryan P.;Moss, Kathryn R.;Janusz-Kaminska, Aleksandra;Knudson, Luke A.;Denes, Lance T.;Saxena, Tanvi;Boggupalli, Devi Prasad;Li, Zhuangyue;Lin, Kun;Bassell, Gary J.;Wang, Eric T.

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RNA结合蛋白(RBP)是空间调控基因表达的关键促进剂。肌盲样(MBNL)蛋白,涉及强直性肌营养不良和癌症,通过未知的机制将RNA定位到成肌细胞膜和神经突。我们发现MBNL在神经元和成肌细胞中形成运动和锚定的颗粒,并通过其锌指结构域选择性地与驱动蛋白Kif 1b α和Kif 1c结合。具有类似ZnFs的其他RBP与这些驱动蛋白相关联,暗示马达RBP特异性代码。MBNL和驱动蛋白扰动导致广泛的mRNA错误定位,包括神经突核仁素转录物的耗尽。活细胞成像和分级显示MBNL 1的非结构化羧基末端尾允许锚定在膜上。一种称为RBP模块募集和成像(RBP-MRI)的方法使用MBNL-MS 2外壳蛋白融合物重建驱动蛋白和膜募集功能。我们的研究结果解耦驱动蛋白协会,RNA结合,和膜锚定功能的MBNL,同时建立一般策略,研究多功能,模块化结构域的RBPs。RNA定位是由驱动蛋白马达和锚定介导的。然而,特异性的机制尚不清楚。在这里,作者发现MBNL蛋白的锌指更喜欢特定的驱动蛋白,其非结构化的尾部介导膜锚定。
RNA binding proteins (RBPs) act as critical facilitators of spatially regulated gene expression. Muscleblind-like (MBNL) proteins, implicated in myotonic dystrophy and cancer, localize RNAs to myoblast membranes and neurites through unknown mechanisms. We find that MBNL forms motile and anchored granules in neurons and myoblasts, and selectively associates with kinesins Kif1bα and Kif1c through its zinc finger (ZnF) domains. Other RBPs with similar ZnFs associate with these kinesins, implicating a motor-RBP specificity code. MBNL and kinesin perturbation leads to widespread mRNA mis-localization, including depletion of Nucleolin transcripts from neurites. Live cell imaging and fractionation reveal that the unstructured carboxy-terminal tail of MBNL1 allows for anchoring at membranes. An approach, termed RBP Module Recruitment and Imaging (RBP-MRI), reconstitutes kinesin- and membrane-recruitment functions using MBNL-MS2 coat protein fusions. Our findings decouple kinesin association, RNA binding, and membrane anchoring functions of MBNL while establishing general strategies for studying multi-functional, modular domains of RBPs. RNA localization is mediated by kinesin motors and anchoring. However, mechanisms underlying specificity are unclear. Here, the authors find that MBNL protein’s zinc fingers prefer specific kinesins, and its unstructured tail mediates membrane anchoring.
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