The E3 ligase adapter cereblon targets the C-terminal cyclic imide degron.

The E3 ligase adapter cereblon targets the C-terminal cyclic imide degron.
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DOI:
10.1038/s41586-022-05333-5
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发表时间:
2022-10
期刊:
影响因子:
64.8
通讯作者:
Woo, Christina M.
Woo, Christina M.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ichikawa, Saki;Flaxman, Hope A.;Xu, Wenqing;Vallavoju, Nandini;Lloyd, Hannah C.;Wang, Binyou;Shen, Dacheng;Pratt, Matthew R.;Woo, Christina M.

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泛素E3连接酶底物适配器Cereblon(CRBN)是沙利度胺和来那度胺的靶标,这两种药物用于治疗血液系统恶性肿瘤,并作为靶向蛋白质降解的配体。这些药物被认为是为了模拟自然发生的降解;然而,CRBN的沙利度胺结合结构域识别的结构基序仍不清楚。在这里,我们报道了C-末端环酰亚胺,翻译后修饰,产生于谷氨酰胺或天冬酰胺残基的分子内环化,是CRBN底物上的生理降解。当嵌入到双功能化学降解剂中时,含有C-末端环酰亚胺降解物的二肽可以替代沙利度胺。在蛋白质的C末端添加降解子可以诱导依赖CRBN的泛素化和在体外和细胞中的降解。在整个人类蛋白质组中,C-末端的环酰亚胺在生理上相关的时间尺度上形成不确定的形式,以提供被CRBN内源性识别和去除的降解。C末端环酰亚胺降糖蛋白的发现定义了一个可能影响CRBN的生理功能和治疗参与的调节过程。
The ubiquitin E3 ligase substrate adapter cereblon (CRBN) is a target of thalidomide and lenalidomide, therapeutic agents used in the treatment of haematopoietic malignancies and as ligands for targeted protein degradation. These agents are proposed to mimic a naturally occurring degron; however, the structural motif recognized by the thalidomide-binding domain of CRBN remains unknown. Here we report that C-terminal cyclic imides, post-translational modifications that arise from intramolecular cyclization of glutamine or asparagine residues, are physiological degrons on substrates for CRBN. Dipeptides bearing the C-terminal cyclic imide degron substitute for thalidomide when embedded within bifunctional chemical degraders. Addition of the degron to the C terminus of proteins induces CRBN-dependent ubiquitination and degradation in vitro and in cells. C-terminal cyclic imides form adventitiously on physiologically relevant timescales throughout the human proteome to afford a degron that is endogenously recognized and removed by CRBN. The discovery of the C-terminal cyclic imide degron defines a regulatory process that may affect the physiological function and therapeutic engagement of CRBN.
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