基于LmrR的人造金属酶中的活性增强突变破坏了蛋白质支架的稳定性,并改变了其结构可塑性
Adil A Safeer1, Fabrizio Casilli2, Wouter Beugelink3
1Utrecht University Faculty of Science: Universiteit Utrecht Faculteit Betawetenschappen, Chemistry, NMR section, NETHERLANDS, KINGDOM OF THE.
Chembiochem : a European journal of chemical biology
|June 13, 2025
概括
激活人工金属酶 (ArM) 中的突变,如乳球菌多药耐药调节器 (LmrR),通过改变蛋白质动态和基质相互作用来增强催化作用. 这项研究揭示了突变如何改善辅因子保留和可塑性,以实现更高效的反应.
科学领域:
- 生物催化和酶工程 生物催化和酶工程
- 蛋白质的结构动态.
- 可持续的化学可持续的化学
背景情况:
- 人工金属酶 (ArM) 为复杂的化学合成提供了可持续的途径.
- 乳球菌多药性耐药性调节剂 (LmrR) 是ARM的多功能支架,通过Cu (II) -phenanthroline辅因子催化Friedel-Crafts化 (FCA).
- 之前的研究发现了突变 (M8D,A92E) 增强LmrR的FCA活性,但分子基础仍然不清楚.
研究的目的:
- 调查M8D和A92E突变对LmrR.形状景观的影响.
- 了解这些突变如何影响ARM的apo,cofactor和基质结合状态.
- 阐明突变LmrR.的增强催化活性背后的分子机制.
主要方法:
- 野生类型和突变LmrR形状的比较分析.
- 在阿波,辅因子和基质结合状态下评估蛋白质动态.
- 结构和相互作用研究,以了解突变效应.
主要成果:
- 突变会破坏LmrR二元化接口的稳定,促进二元-单元平衡.
- 在突变者身上观察到一个更开放的中央疏水腔.
- 虽然口袋形状在辅因子结合状态中类似,但突变体表现出明显的基质相互作用.
结论:
- 在突变的LmrR中观察到的可塑性和改变的基质相互作用有助于提高催化效率.
- 增强的辅助因子保留和扩大动态范围是增加活动的关键因素.
- 了解这些结构功能关系对于合理设计高度活跃的ARM至关重要.
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