蛋白质-联结体晶体结构中基抑制剂和联结体的特定辐射损伤
Matthew J Rodrigues1,2, Marc Cabry1,2, Gavin Collie1,2
1Centre for Cancer Drug Discovery The Institute of Cancer Research 15 Cotswold Road Sutton LondonSM2 5NG United Kingdom.
概括
在X射线衍射过程中的特定辐射损伤可以在药物分子中切割碳-素键. 这项研究揭示了这种损害对蛋白质连接体结构和数据质量的影响,并提供了缓解策略.
科学领域:
- 结构生物学是结构生物学.
- 药物化学 药物化学
- 药物发现 药物发现
背景情况:
- 蛋白抑制剂晶体结构对于开发强效和选择性小分子抑制剂至关重要.
- 在药物发现中,化合物约占分子的25%.
- 配体中的素原子可以与蛋白质标形成有益的素键,增强结合亲和力和互补性.
研究的目的:
- 为了研究特定辐射损伤 (SRD) 对蛋白质 - 配体复合体中碳 - (C-X) 键的影响.
- 评估素类型和配体化学结构对C-X键裂变的影响.
- 评估SRD对结构质量指标和异常信号的影响.
主要方法:
- 分析蛋白质连接体晶体结构,包括B细胞淋巴瘤6 (BCL6) 和热冲击蛋白72 (HSP72) 含有化连接体的晶体结构.
- 采集不同辐射剂量的X射线衍射数据.
- 对联体适应电子密度和异常散射信号的评估.
主要成果:
- 在BCL6和HSP72复合物中观察到显著的C-X键裂解与基联体,这取决于基类型和联体结构.
- 随着X射线剂量的增加,连接体适合度指标恶化.
- SRD消除了来自联体的异常信号,阻碍了结合部位的识别和实验分相.
结论:
- SRD对化药物候选药物的结构研究构成挑战,影响结构完整性和数据解释.
- 确定了数据冗余性回报的减少点,对异常信号产生负面影响.
- 拟议的简单策略旨在减轻C-X键裂变,并增强素联体蛋白结构的异常散射实验.
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