与thalidomide复合的DDB1-CRBN E3泛素结合酶的结构
Eric S Fischer1, Kerstin Böhm1, John R Lydeard2
11] Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland [2] University of Basel, Petersplatz 10, CH-4003 Basel, Switzerland.
Nature
|July 22, 2014
概括
免疫调节药物 (IMiDs) 尽管过去具有致性,但现在通过向CRL4 (CRBN) E3无素连酶来治疗癌症. 新的结构揭示了IMiD如何结合CRBN,阻断某些基质,同时促进其他向蛋白质降解.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- thalidomide及其衍生物 (lenalidomide,pomalidomide),称为免疫调节药物 (IMiDs),是治疗多发性骨髓瘤和5q-删除相关性发育不良的有效治疗方法.
- 尽管IMiDs具有致病性,但它们的向是E3无素结合酶CUL4-RBX1-DDB1-CRBN (CRL4(CRBN)).
- CRL4 ((CRBN) 中介于IKAROS家族转录因子IKZF1和IKZF3.3的无处不在和降解.
研究的目的:
- 阐明IMID与DDB1-CRBN复合体结合的结构基础.
- 为了确定CRL4的内源基质 (CRBN).
- 了解IMIDs调节CRL4 (CRBN) 活动的机制.
主要方法:
- 使用X射线晶体学来确定与thalidomide,lenalidomide和pomalidomide结合的DDB1-CRBN复合物的结构.
- 采用了无偏见的选方法来识别CRL4的内源基质 (CRBN).
主要成果:
- 晶体结构显示CRBN是CRL4 (CRBN) 中的基质受体,该受体以酶选择性方式结合IMiDs.
- 鉴定出homeobox转录因子MEIS2作为CRL4的内源基质.
- IMiDs被证明可以阻止内源基质的结合,如MEIS2到CRL4 (CRBN) 在招募IKZF1或IKZF3降解期间.
结论:
- CRBN作为CRL4的基质受体,调解IMiD结合和基质无化.
- IMiDs具有双重活性:促进IKZF1/IKZF3的降解,同时抑制MEIS2等其他基质的降解.
- 这种双重机制突出显示了小分子精确调节E3无素酶活性的潜力,提供了新的治疗策略.
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