Recognition of an Ala-rich C-degron by the E3 ligase Pirh2.

Recognition of an Ala-rich C-degron by the E3 ligase Pirh2.
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DOI:
10.1038/s41467-023-38173-6
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发表时间:
2023-04-29
影响因子:
16.6
通讯作者:
Dong, Cheng
Dong, Cheng
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang, Xiaolu;Li, Yao;Yan, Xiaojie;Yang, Qing;Zhang, Bing;Zhang, Ying;Yuan, Xinxin;Jiang, Chenhao;Chen, Dongxing;Liu, Quanyan;Liu, Tong;Mi, Wenyi;Yu, Ying;Dong, Cheng

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核糖体相关质量控制(RQC)途径降解翻译过程中核糖体停滞产生的异常新生多肽。在哺乳动物中,E3连接酶Pirh 2通过靶向C-末端聚丙氨酸降解决定子(polyAla/C-degron)介导异常新生多肽的降解。在这里,我们提出了结合到聚丙氨酸/C-降解决定子的Pirh 2的晶体结构,这表明Pirh 2的N-末端结构域和RING结构域形成了一个狭窄的凹槽,将聚丙氨酸/C-降解决定子的丙氨酸残基包封起来。体外亲和力测量和细胞中的整体蛋白质稳定性测定进一步证明Pirh 2识别用于底物降解的C-末端A/S-X-A-A基序。综上所述,我们的研究提供了Pirh 2识别polyAla/C-degron的分子基础,并扩展了Pirh 2的底物识别谱。翻译过程中核糖体停滞产生的不完全合成的新生多肽受到核糖体相关质量控制的监督。在这里,作者报告了E3连接酶Pirh 2通过C-degron途径靶向异常新生链的聚丙氨酸尾部进行降解的分子机制。
The ribosome-associated quality-control (RQC) pathway degrades aberrant nascent polypeptides arising from ribosome stalling during translation. In mammals, the E3 ligase Pirh2 mediates the degradation of aberrant nascent polypeptides by targeting the C-terminal polyalanine degrons (polyAla/C-degrons). Here, we present the crystal structure of Pirh2 bound to the polyAla/C-degron, which shows that the N-terminal domain and the RING domain of Pirh2 form a narrow groove encapsulating the alanine residues of the polyAla/C-degron. Affinity measurements in vitro and global protein stability assays in cells further demonstrate that Pirh2 recognizes a C-terminal A/S-X-A-A motif for substrate degradation. Taken together, our study provides the molecular basis underlying polyAla/C-degron recognition by Pirh2 and expands the substrate recognition spectrum of Pirh2. Incompletely synthesized nascent polypeptides resulting from ribosome stalling during translation are under surveillance by ribosome-associated quality control. Here, the authors report the molecular mechanism by which the E3 ligase Pirh2 targets the polyalanine tail of aberrant nascent chains for degradation via the C-degron pathway.
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