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首页> 外文期刊>Molecular cell >Hsm3/S5b participates in the assembly pathway of the 19S regulatory particle of the proteasome.
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Hsm3/S5b participates in the assembly pathway of the 19S regulatory particle of the proteasome.

机译:Hsm3 / S5b参与蛋白酶体的19S调节颗粒的组装途径。

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摘要

The 26S proteasome, the central enzyme of the ubiquitin-proteasome system, is comprised of the 20S catalytic core particle (CP) and the 19S regulatory particle (RP), itself composed of two subcomplexes, the base and the lid. 20S proteasome assembly is assisted by several chaperones. Integral subunits of the RP participate in its assembly, but no external factors have been identified so far. Here we characterize the yeast Hsm3 protein, which displays unique features regarding 19S assembly. Hsm3 associates with 19S subcomplexes via a carboxy-terminal domain of the Rpt1 base subunit but is missing in the final 26S proteasome. Moreover, Hsm3 is specifically required for the base subcomplex assembly. Finally, we identify the putative species-specific 19S subunit S5b as a functional homolog of the Hsm3 chaperone in mammals. These findings shed light on chaperone-assisted proteasome assembly in eukaryotes.
机译:26S蛋白酶体是泛素-蛋白酶体系统的中心酶,由20S催化核心颗粒(CP)和19S调节颗粒(RP)组成,其本身由两个亚复合物组成,即碱基和盖子。 20S蛋白酶体的组装由几个分子伴侣协助。 RP的整体亚基参与其组装,但到目前为止尚未发现任何外部因素。在这里,我们表征酵母Hsm3蛋白,该蛋白显示有关19S装配的独特功能。 Hsm3通过Rpt1碱基亚基的羧基末端结构域与19S亚复合体缔合,但在最终的26S蛋白酶体中缺失。此外,Hsm3是基础子复合体组件特别需要的。最后,我们将推定的物种特异性19S亚基S5b确定为Hsm3伴侣在哺乳动物中的功能同源物。这些发现揭示了在真核生物中伴侣辅助的蛋白酶体组装。

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