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首页> 外文期刊>Cell motility and the cytoskeleton >Cytoplasmic dynein/dynactin mediates the assembly of aggresomes.
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Cytoplasmic dynein/dynactin mediates the assembly of aggresomes.

机译:细胞质动力蛋白/动力蛋白介导聚集体的组装。

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摘要

Aggresomes are pericentrosomal cytoplasmic structures into which aggregated, ubiquitinated, misfolded proteins are sequestered. Misfolded proteins accumulate in aggresomes when the capacity of the intracellular protein degradation machinery is exceeded. Previously, we demonstrated that an intact microtubule cytoskeleton is required for the aggresome formation [Johnston et al., 1998: J. Cell Biol. 143:1883-1898]. In this study, we have investigated the involvement of microtubules (MT) and MT motors in this process. Induction of aggresomes containing misfolded DeltaF508 CFTR is accompanied by a redistribution of the retrograde motor cytoplasmic dynein that colocalizes with aggresomal markers. Coexpression of the p50 (dynamitin) subunit of the dynein/dynactin complex prevents the formation of aggresomes, even in the presence of proteasome inhibitors. Using in vitro microtubule binding assays in conjunction with immunogold electron microscopy, our data demonstrate that misfolded DeltaF508 CFTR associate with microtubules. We conclude that cytoplasmic dynein/dynactin is responsible for the directed transport of misfolded protein into aggresomes. The implications of these findings with respect to the pathogenesis of neurodegenerative disease are discussed. Cell Motil. Cytoskeleton 53:26-38, 2002.
机译:聚集体是中心体周围的胞质结构,聚集的,泛素化的,错误折叠的蛋白质被隔离在其中。当细胞内蛋白质降解机制的能力被超过时,错误折叠的蛋白质会积聚在聚集体中。以前,我们证明了完整的微管细胞骨架是聚集体形成所必需的[Johnston等,1998:J.Cell Biol.Acad.Sci.USA,89:3587-5877]。 143:1883-1898]。在这项研究中,我们调查了微管(MT)和MT电机在此过程中的参与。包含错误折叠的DeltaF508 CFTR的聚集体的诱导伴随着与聚集体标志物共定位的逆行运动细胞质动力蛋白的重新分布。动力蛋白/动力蛋白复合物的p50(动力素)亚基的共表达可防止聚集体的形成,即使存在蛋白酶体抑制剂也是如此。使用体外微管结合测定结合免疫金电子显微镜,我们的数据表明错误折叠的DeltaF508 CFTR与微管相关。我们得出的结论是,细胞质动力蛋白/动力蛋白负责将错误折叠的蛋白质定向转运到聚集体中。讨论了这些发现对神经退行性疾病发病机制的影响。细胞动力。 Cytoskeleton 53:26-38,2002。

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