A trio of ubiquitin ligases sequentially drives ubiquitylation and autophagic degradation of dysfunctional yeast proteasomes.

A trio of ubiquitin ligases sequentially drives ubiquitylation and autophagic degradation of dysfunctional yeast proteasomes.
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三种泛素连接酶依次驱动功能失调的酵母蛋白酶体的泛素化和自噬降解。

DOI:
10.1016/j.celrep.2022.110535
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发表时间:
2022
期刊:
影响因子:
8.8
通讯作者:
Vierstra,RichardD
Vierstra,RichardD
中科院分区:
生物学1区
文献类型:
--
作者:
Marshall,RichardS;Vierstra,RichardD

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作为泛素(Ub)介导的蛋白降解的中心效应因子,蛋白酶体在多个水平上受到调控,包括通过自噬(称为蛋白吞噬)降解不需要的或功能障碍的颗粒。在酵母中,不活跃的蛋白酶体从细胞核输出,通过Hsp42伴侣隔离到细胞质侵袭体中,广泛泛素化,然后通过自噬受体Cue5连接到正在扩张的吞噬体上。在这里,我们证明了Ub连接酶(E3s)、San1、Rsp5和Hul5三者驱动泛素化的必要性,它们与相应的E2s一起依次促进核出口和Cue5识别。虽然San1的功能先于核出口,但Rsp5和Hul5可能协同修饰侵袭体定位的蛋白酶体。最终,包含K48和K63的拓扑复杂的Ub链(S)-Ub连接被组装在调节颗粒上,以产生具有自噬能力的底物。由于San1、Rsp5、Hul5、Hsp42和Cue5也参与一般的蛋白稳定,蛋白吞噬可能参与了消除非活性/错误折叠的蛋白质的基本机制。
As central effectors of ubiquitin (Ub)-mediated proteolysis, proteasomes are regulated at multiple levels, including degradation of unwanted or dysfunctional particles via autophagy (termed proteaphagy). In yeast, inactive proteasomes are exported from the nucleus, sequestered into cytoplasmic aggresomes via the Hsp42 chaperone, extensively ubiquitylated, and then tethered to the expanding phagophore by the autophagy receptor Cue5. Here, we demonstrate the need for ubiquitylation driven by the trio of Ub ligases (E3s), San1, Rsp5, and Hul5, which together with their corresponding E2s work sequentially to promote nuclear export and Cue5 recognition. Whereas San1 functions prior to nuclear export, Rsp5 and Hul5 likely decorate aggresome-localized proteasomes in concert. Ultimately, topologically complex Ub chain(s) containing both K48 and K63 Ub-Ub linkages are assembled, mainly on the regulatory particle, to generate autophagy-competent substrates. Because San1, Rsp5, Hul5, Hsp42, and Cue5 also participate in general proteostasis, proteaphagy likely engages a fundamental mechanism for eliminating inactive/misfolded proteins.
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DOI: 10.1111/j.1432-1033.1985.tb08933.x
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