Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada.
Int J Mol Sci. 2024 May 23;25(11):5686. doi: 10.3390/ijms25115686.
Formin Homology Proteins (Formins) are a highly conserved family of cytoskeletal regulatory proteins that participate in a diverse range of cellular processes. FMNL2 is a member of the Diaphanous-Related Formin sub-group, and previous reports suggest FMNL2's role in filopodia assembly, force generation at lamellipodia, subcellular trafficking, cell-cell junction assembly, and focal adhesion formation. How FMNL2 is recruited to these sites of action is not well understood. To shed light on how FMNL2 activity is partitioned between subcellular locations, we used biotin proximity labeling and proteomic analysis to identify an FMNL2 interactome. The interactome identified known and new FMNL2 interacting proteins with functions related to previously described FMNL2 activities. In addition, our interactome predicts a novel connection between FMNL2 and extracellular vesicle assembly. We show directly that FMNL2 protein is present in exosomes.
formin 同源蛋白(formin)是一组高度保守的细胞骨架调节蛋白,参与多种细胞过程。FMNL2 是 Diaphanous 相关formin 亚群的成员,先前的报告表明 FMNL2 在丝状伪足组装、片状伪足产生力、细胞内运输、细胞-细胞连接组装和焦点粘附形成中的作用。FMNL2 如何被招募到这些作用部位尚不清楚。为了阐明 FMNL2 活性如何在亚细胞位置之间分配,我们使用生物素接近标记和蛋白质组学分析来鉴定 FMNL2 相互作用组。相互作用组鉴定了已知和新的 FMNL2 相互作用蛋白,这些蛋白的功能与先前描述的 FMNL2 活性相关。此外,我们的相互作用组预测了 FMNL2 与细胞外囊泡组装之间的新联系。我们直接表明 FMNL2 蛋白存在于外泌体中。
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