The ZZ domain of HERC2 is a receptor of arginylated substrates.

The ZZ domain of HERC2 is a receptor of arginylated substrates.
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HERC2的ZZ结构域是乙酰化底物的受体。

DOI:
10.1038/s41598-022-10119-w
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发表时间:
2022-04-11
期刊:
影响因子:
4.6
通讯作者:
Kutateladze, Tatiana G.
Kutateladze, Tatiana G.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tencer, Adam H.;Liu, Jiuyang;Zhu, Jing;Burkholder, Nathaniel T.;Zhang, Yi;Wu, Wenwen;Strahl, Brian D.;Ohta, Tomohiko;Kutateladze, Tatiana G.

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E3泛素连接酶HERC2与神经系统疾病和癌症有关,但它仍然是一种特性不佳的人类蛋白质。在这里,我们证明了HERC2的ZZ结构域(HERC2ZZ)识别NT-R货物降解信号的模拟物。核磁共振滴定实验和诱变结果表明,NT-R模拟肽占据了HERC2ZZ明确的结合部位,其中包括带负电荷的天冬氨酸。我们报道了与HERC2ZZ相邻的HERC2的DOC结构域(HERC2DOC)的晶体结构,并表明当这两个结构域连接时,蛋白质中可能发生构象重排。免疫荧光显微镜数据表明,自噬的刺激促进了HERC2靶向蛋白酶体。我们的发现表明,胞浆HERC2在泛素依赖的降解途径中发挥作用。
The E3 ubiquitin ligase HERC2 has been linked to neurological diseases and cancer, however it remains a poorly characterized human protein. Here, we show that the ZZ domain of HERC2 (HERC2ZZ) recognizes a mimetic of the Nt-R cargo degradation signal. NMR titration experiments and mutagenesis results reveal that the Nt-R mimetic peptide occupies a well-defined binding site of HERC2ZZ comprising of the negatively charged aspartic acids. We report the crystal structure of the DOC domain of HERC2 (HERC2DOC) that is adjacent to HERC2ZZ and show that a conformational rearrangement in the protein may occur when the two domains are linked. Immunofluorescence microscopy data suggest that the stimulation of autophagy promotes targeting of HERC2 to the proteasome. Our findings suggest a role of cytosolic HERC2 in the ubiquitin-dependent degradation pathways.
通过p62/sqstm1自噬适配器对N端规则底物的降解机制的见解。
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