Department of Molecular Biology and Genetics, Koç University, Istanbul, Turkey.
Department of Chemical Biology, The Scripps Research Institute, La Jolla, CA, USA.
EMBO Rep. 2021 Aug 4;22(8):e51902. doi: 10.15252/embr.202051902. Epub 2021 Jun 25.
Aurora kinase A (AURKA) is a conserved kinase that plays crucial roles in numerous cellular processes. Although AURKA overexpression is frequent in human cancers, its pleiotropic functions and multifaceted regulation present challenges in its therapeutic targeting. Key to overcoming these challenges is to identify and characterize the full range of AURKA interactors, which are often weak and transient. Previous proteomic studies were limited in monitoring dynamic and non-mitotic AURKA interactions. Here, we generate the proximity interactome of AURKA in asynchronous cells, which consists of 440 proteins involving multiple biological processes and cellular compartments. Importantly, AURKA has extensive proximate and physical interactions to centriolar satellites, key regulators of the primary cilium. Loss-of-function experiments identify satellites as negative regulators of AURKA activity, abundance, and localization in quiescent cells. Notably, loss of satellites activates AURKA at the basal body, decreases centrosomal IFT88 levels, and causes ciliogenesis defects. Collectively, our results provide a resource for dissecting spatiotemporal regulation of AURKA and uncover its proteostatic regulation by satellites as a new mechanism for its ciliary functions.
极光激酶 A(AURKA)是一种保守的激酶,在许多细胞过程中发挥着关键作用。尽管 AURKA 在人类癌症中过度表达很常见,但它的多功能性和多面性调节给其治疗靶点带来了挑战。克服这些挑战的关键是识别和表征 AURKA 的全部相互作用物,这些相互作用物通常较弱且短暂。以前的蛋白质组学研究在监测动态和非有丝分裂 AURKA 相互作用方面受到限制。在这里,我们在非同步细胞中生成了 AURKA 的邻近相互作用组,其中包含 440 种蛋白质,涉及多个生物学过程和细胞区室。重要的是,AURKA 与中心粒卫星有广泛的邻近和物理相互作用,中心粒卫星是初级纤毛的关键调节因子。功能丧失实验表明卫星是 AURKA 活性、丰度和在静止细胞中定位的负调节剂。值得注意的是,卫星的缺失会激活基底体外的 AURKA,降低中心体IFT88 的水平,并导致纤毛发生缺陷。总的来说,我们的研究结果为解析 AURKA 的时空调节提供了资源,并揭示了卫星对其蛋白稳态调节作为其纤毛功能的新机制。
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