UFD-2 is an adaptor-assisted E3 ligase targeting unfolded proteins.

UFD-2 is an adaptor-assisted E3 ligase targeting unfolded proteins.
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DOI:
10.1038/s41467-018-02924-7
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发表时间:
2018-02-02
影响因子:
16.6
通讯作者:
Clausen T
Clausen T
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hellerschmied D;Roessler M;Lehner A;Gazda L;Stejskal K;Imre R;Mechtler K;Dammermann A;Clausen T

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肌肉发育需要特定蛋白质折叠和降解因子的协调活动。据报道,UFD-2 是一种 U-box 泛素连接酶,在调节肌球蛋白伴侣 UNC-45 的管弦乐队中发挥着核心作用。在这里,我们应用体外和体内综合方法来描述 UFD-2 的底物靶向机制,并阐明其作为 E3/E4 酶的独特机制特征。使用秀丽隐杆线虫作为模型系统,我们证明 UFD-2 并不调节肌肉细胞中 UNC-45 的蛋白质水平,而是显示了参与蛋白质质量控​​制的真正 E3 连接酶的特性。我们的数据表明 UFD-2 优先靶向未折叠的蛋白质片段。此外,UNC-45分子伴侣可以作为UFD-2的接头蛋白,对未折叠的肌球蛋白进行多泛素化,这表明UFD-2/UNC-45对在维持肌肉细胞的蛋白质稳态中可能发挥作用。 U-box 泛素连接酶 UFD-2 是肌肉细胞中泛素蛋白酶体系统最丰富的成分之一。在这里,作者进行了体外和体内实验,结果表明 UFD-2 具有 E3 连接酶活性,并且它使用线虫肌球蛋白伴侣 UNC-45 作为衔接蛋白泛素化未折叠的肌球蛋白。
Muscle development requires the coordinated activities of specific protein folding and degradation factors. UFD-2, a U-box ubiquitin ligase, has been reported to play a central role in this orchestra regulating the myosin chaperone UNC-45. Here, we apply an integrative in vitro and in vivo approach to delineate the substrate-targeting mechanism of UFD-2 and elucidate its distinct mechanistic features as an E3/E4 enzyme. Using Caenorhabditis elegans as model system, we demonstrate that UFD-2 is not regulating the protein levels of UNC-45 in muscle cells, but rather shows the characteristic properties of a bona fide E3 ligase involved in protein quality control. Our data demonstrate that UFD-2 preferentially targets unfolded protein segments. Moreover, the UNC-45 chaperone can serve as an adaptor protein of UFD-2 to poly-ubiquitinate unfolded myosin, pointing to a possible role of the UFD-2/UNC-45 pair in maintaining proteostasis in muscle cells. The U-box ubiquitin ligase UFD-2 is one of the most abundant components of the ubiquitin proteasome system in muscle cells. Here the authors perform in vitro and in vivo experiments and show that UFD-2 has E3 ligase activity and that it ubiquitinates unfolded myosin using the C. elegans myosin chaperone UNC-45 as an adaptor protein.
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