移动胆固醇抗性蛋白的活性部位的序列变异是通过域间相互作用进化地适应的
1Department of Biology, Indian Institute of Science Education and Research, Pashan, Pune, India.
The Biochemical journal
|November 7, 2024
概括
移动胆固醇耐药性 (MCR) 蛋白质中自然存在的变异会影响抗生素耐药性. 在MCR-1和MCR-5蛋白质结构中微妙的差异解释了为什么突变会以不同的方式影响胆固醇抗性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 移动胆固醇耐药性 (MCR) 蛋白质对胆固醇产生耐药性,胆固醇是格兰阴性细菌感染的关键最后避难所抗生素.
- 同类蛋白质的序列变异可以阐明功能和进化关系.
- 了解MCR蛋白的变异对于对抗抗生素耐药性至关重要.
研究的目的:
- 分析MCR蛋白内催化残留的序列变化.
- 为了研究MCR-1中脂质A结合残留Ser284变异的功能影响.
- 追踪MCR变异的进化起源并了解其机制基础.
主要方法:
- 分析MCR蛋白质中催化残留的序列变化.
- 局部定向的突变发生和功能测试,以评估胆固醇抗性.
- 遗传学分析来追踪进化的历史.
- 基于AlphaFold的结构建模用于预测蛋白质结构.
主要成果:
- 并非所有天然存在的Ser284变体都能在MCR-1中被容忍;Ser284Asp替代 (在MCR-5中发现) 降低了胆固醇抗性.
- 遗传学分析追溯了Ser284的MCR变异到祖先的EptA甲胺转移酶.
- 结构建模显示,MCR-1和MCR-5之间的域间相互作用不同,这解释了尽管保持了催化域的差异性突变耐受性.
结论:
- 位置284的功能重要性在MCR-1和MCR-5之间因域间相互作用的差异而有所不同.
- 来自不同的祖先的MCR蛋白质的微妙结构差异导致催化活性和突变耐受性的显著变化.
- 这项研究提供了对蛋白质域组织如何影响抗生素耐药性表型的机制性理解.
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