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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
在一个1,4-环基PROTAC链接器中,立体化学反向微调调整了结合性和结合亲和度的形状
Martina Pierri1, Xingui Liu1, Alena Kroupova1
1Centre for Targeted Protein Degradation, School of Life Sciences, University of Dundee, 1 James Lindsay Place, DD1 5JJ Dundee, United Kingdom.
蛋白质溶解向嵌合体 (PROTACs) 中的立体化学显著影响E3酶的结合和降解. 一种跨环基PROTAC连接剂,尽管结合较弱,但通过改变形状和三元复合体形成来增强降解.
科学领域:
- 生物化学 生物化学
- 药用化学 医学化学
- 结构生物学 结构生物学
背景情况:
- 针对蛋白质溶解的嵌合体 (PROTACs) 是诱导向蛋白质降解的异构功能分子.
- 连接目标结合和E3酶结合部分的链接器极大地影响了PROTAC的疗效.
- 链接器中的立体化学可以微妙地改变PROTAC的特性和生物活性.
研究的目的:
- 调查PROTAC链接器中的立体化学对E3酶 (VHL) 结合亲和力的影响.
- 了解链接器构造如何影响三元复合体形成和降解活动.
- 阐明 cis-和 trans-cyclohexyl PROTAC 类似物之间差异性降解活性的结构基础.
主要方法:
- 设计和合成分子匹配对的PROTACs和VHL配体.
- 生物化学测试以确定对VHL的连接物结合亲缘关系.
- 高分辨率的共同晶体学可视化联结体-E3联结酶相互作用.
- 细胞降解测试以评估PROTAC的疗效.
主要成果:
- 转环基PROTAC类似物与其cis-对应物相比,对VHL的结合亲和力较弱.
- 同晶体结构显示出明显的链接体构造:跨环基采用了刚性,延伸的姿势,而cis-cyclohexyl显示了折叠后的构造.
- 链体的折叠形状涉及与VHL的分子内接触和相互作用,影响结合.
- 尽管二进制结合较弱,但跨链体PROTAC表现出增强的降解活性.
结论:
- 在PROTAC链接器中的立体化学逆转显著改变了E3结合酶的结构刚性和结合模式.
- 连接器构造对二进制和三进制复合体形成的倾向产生重大影响.
- 这些形状和结合差异最终微调了细胞蛋白质降解活性,突出显示了PROTAC中链接器设计的重要性.
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