高活性G-四重复 DNA 酶的合理重新设计,通过侧翼和循环的核基
Raphael I Adeoye1, Nikhildas Babbudas1, Matthew Birchenough1
1School of Pharmacy & Biomolecular Sciences, Faculty of Health, Innovation, Technology and Science, Liverpool John Moores University, Liverpool, L3 3AF, UK.
Scientific reports
|January 12, 2026
概括
重新设计的G-四重复 (G4) DNA酶显示出增强的过氧化酶活性和稳定性. 战略性修改提高了催化效率,使它们成为下一代生物传感器的前景.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 纳米技术纳米技术
背景情况:
- G-四重复 (G4) DNA酶模仿过氧化酶的活性,为蛋白质酶提供生物感知替代品.
- 低的催化效率目前限制了它们在生物传感中的实际应用.
研究的目的:
- 通过结构引导的重新设计来提高G4DNA酶的催化效率和稳定性.
- 为了研究侧翼和循环核基基修改对DNA酶性能的影响.
主要方法:
- 通过整合侧翼和循环核基修改,对[B7]-3-0体进行结构引导的重新设计.
- 在不同氧化度下评估过氧化酶模仿活性.
- 将催化效率和稳定性与已建立的DNA酶 (AS1411,CatG4) 进行比较.
主要成果:
- 修改后的B730变种反应范围增加了多达4倍,初始速度增加了3倍.
- 增强型变种在升高的H2O2水平下保持了显著的活性,显示了高达8倍的催化性能改善.
- 与现有的G4DNAzymes相比,重新设计的DNAzymes显示出更高的过氧化酶活性和抗氧化失活的抵抗力.
结论:
- 侧翼和循环工程是优化G4DNAzyme催化效率和稳定的有效策略.
- 重新设计的G4DNAzymes显示出开发具有性能改进的先进生物传感器的巨大潜力.
- 这种方法解决了过氧化酶活性和氧化稳定性的局限性,扩大了DNAzyme的适用性.
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