小脑
泛素连接酶
沙利度胺
泊马度胺
DDB1型
泛素蛋白连接酶类
泛素
转录因子
癌症研究
化学
细胞生物学
来那度胺
生物
多发性骨髓瘤
遗传学
免疫学
基因
作者
Eric S. Fischer,K. H. Böhm,John R. Lydeard,Haidi Yang,Michael Stadler,Simone Cavadini,Jane Nagel,Fabrizio C. Serluca,Vincent Acker,Gondichatnahalli M. Lingaraju,Ritesh B. Tichkule,Michael Schebesta,William C. Forrester,Markus Schirle,Ulrich Hassiepen,Johannes Ottl,Marc Hild,Rohan E. J. Beckwith,J. Wade Harper,Jeremy L. Jenkins,Nicolas H. Thomä
出处
期刊:Nature
[Springer Nature]
日期:2014-07-16
卷期号:512 (7512): 49-53
被引量:746
摘要
In the 1950s, the drug thalidomide, administered as a sedative to pregnant women, led to the birth of thousands of children with multiple defects. Despite the teratogenicity of thalidomide and its derivatives lenalidomide and pomalidomide, these immunomodulatory drugs (IMiDs) recently emerged as effective treatments for multiple myeloma and 5q-deletion-associated dysplasia. IMiDs target the E3 ubiquitin ligase CUL4-RBX1-DDB1-CRBN (known as CRL4(CRBN)) and promote the ubiquitination of the IKAROS family transcription factors IKZF1 and IKZF3 by CRL4(CRBN). Here we present crystal structures of the DDB1-CRBN complex bound to thalidomide, lenalidomide and pomalidomide. The structure establishes that CRBN is a substrate receptor within CRL4(CRBN) and enantioselectively binds IMiDs. Using an unbiased screen, we identified the homeobox transcription factor MEIS2 as an endogenous substrate of CRL4(CRBN). Our studies suggest that IMiDs block endogenous substrates (MEIS2) from binding to CRL4(CRBN) while the ligase complex is recruiting IKZF1 or IKZF3 for degradation. This dual activity implies that small molecules can modulate an E3 ubiquitin ligase and thereby upregulate or downregulate the ubiquitination of proteins.
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