Cytoplasmic dynein is required for the spatial organization of protein aggregates in filamentous fungi.

Cytoplasmic dynein is required for the spatial organization of protein aggregates in filamentous fungi.
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丝状真菌中蛋白质聚集体的空间组织需要细胞质动力蛋白。

DOI:
10.1016/j.celrep.2015.03.028
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发表时间:
2015
期刊:
影响因子:
8.8
通讯作者:
Reck-Peterson,SamaraL
Reck-Peterson,SamaraL
中科院分区:
生物学1区
文献类型:
--
作者:
Egan,MartinJ;McClintock,MarkA;Hollyer,IanHL;Elliott,HunterL;Reck-Peterson,SamaraL

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真核生物已经进化出多种维持细胞蛋白质稳态的策略。一种这样的机制涉及通过其限定的空间分离来中和有害的蛋白质聚集体。在这里,使用分子解聚酶Hsp104作为蛋白质聚集的标记,我们描述了丝状真菌构巢曲霉蛋白质聚集体的时空动态。丝状真菌,如构巢曲霉阿萨,是一组具有重要健康和经济意义的物种,也是研究高度极化真核细胞的模型系统。我们发现,微管促进热休克蛋白104阳性聚集体的形成,它合并成离散的亚细胞结构的过程中依赖于微管为基础的运动细胞质动力蛋白。最后,我们发现这些内含物的清除受损会对内体(一种传统的动力蛋白货物)的逆行运输产生负面影响,这表明基于微管的运输可能会被慢性细胞应激所淹没。
Eukaryotes have evolved multiple strategies for maintaining cellular protein homeostasis. One such mechanism involves neutralization of deleterious protein aggregates via their defined spatial segregation. Here, using the molecular disaggregase Hsp104 as a marker for protein aggregation, we describe the spatial and temporal dynamics of protein aggregates in the filamentous fungusAspergillus nidulans. Filamentous fungi, such asA. nidulans, are a diverse group of species of major health and economic importance and also serve as model systems for studying highly polarized eukaryotic cells. We find that microtubules promote the formation of Hsp104-positive aggregates, which coalesce into discrete subcellular structures in a process dependent on the microtubule-based motor cytoplasmic dynein. Finally, we find that impaired clearance of these inclusions negatively impacts retrograde trafficking of endosomes, a conventional dynein cargo, indicating that microtubule-based transport can be overwhelmed by chronic cellular stress.
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