螺旋10区域作为A类β-乳糖酶抑制结合中的Allosteric站点的形态动态
Liwen Huang1,2,3, Pui-Kin So4, Yu Wai Chen1,3
1State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Special Administrative Region, China.
Journal of the American Chemical Society
|July 21, 2020
概括
对A类β- 乳糖酶的作用有所不同. 形态动态揭示了影响抑制的关键循环重组和全位,指导了新型抑制剂的设计.
科学领域:
- 生物化学
- 结构生物学
- 分子动力学
背景情况:
- 甲-乳糖酶抑制蛋白 (BLIP) 不同强度的抑制甲-乳糖酶.
- 来自X射线晶体学的静态结构对BLIP的抑制机制提供了有限的见解.
- 了解动态形状变化对于设计有效的抑制剂至关重要.
研究的目的:
- 阐明三种A类β-乳糖酶 (PC1,TEM1,SHV1) 的结构动态及其与BLIP的相互作用.
- 确定负责不同抑制效率的结构决定因素.
- 探索增强BLIP抑制活性的策略.
主要方法:
- 离子移动性质谱
- 交换质谱学
- 分子动力学模拟
主要成果:
- 甲类β-乳酸酶表现出不同的形状动态,PC1表现出比TEM1和SHV1更广泛的形状.
- 特定的循环区域 (突出,H10, Ω,SDN) 在BLIP结合时经历合作重组,影响催化部位的不活化.
- 在SHV1和PC1突出的循环中不利的动态与效率较低的结合相关,而单个BLIP突变可以增强抑制.
- H10区域充当全位调节抑制的作用,其灵活性和突出的循环的刚性可能决定TEM1的有效抑制.
结论:
- 在BLIP对A类β- lactamases的抑制效率变化中,形态动力学起着至关重要的作用.
- 识别特定的动态特征和位为合理的抑制剂设计提供了基础.
- 这项研究为beta- lactamase- BLIP相互作用提供了明确的见解,为开发新疗法铺平了道路.
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