抗菌及其同类与模型细菌和红细胞膜之间的相互作用的结构和功能影响
Michele Lika Furuya1, Gustavo Penteado Carretero1,2, Marcelo Porto Bemquerer3
1Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo 05508-220, Brazil.
Biomolecules
|August 28, 2025
概括
修改了抗菌 (AMP) 以提高对细菌的活性. 用氨酸替代氨酸提高了疗效,但增加的疏水性降低了活性,并增加了红细胞溶解.
科学领域:
- 生物化学
- 微生物学
- 生物物理
背景情况:
- 抗菌 (AMP) 对于对病原体的天生的免疫非常重要.
- 对AMP的修改可以改变它们的膜相互作用和抗菌性质.
研究的目的:
- 研究两种BP100类似物与细菌和红细胞膜的相互作用.
- 评估特定修改 (Lys/Arg替代和C端化) 对AMP活性和膜破坏的影响.
主要方法:
- 制备模仿细菌和红细胞脂质组成的大型和巨型单囊 (LUV和GUV).
- 使用光光谱,动态光散射 (DLS),泽塔电位测量和循环二元化 (CD) 的脂相互作用的表征.
- 通过碳氧素释放试验评估膜透性,并确定对细菌菌株的最小抑制度 (MIC).
主要成果:
- 结诱导了囊泡聚合,并赋予了的α-螺旋形状.
- 膜透度 (C50) 变化,在格兰阴性细菌和红细胞中BP100> R2R5-BP100> R2R5-BP100-A-NH-C16
- 的修饰导致了Gram阳性和Gram阴性细菌的膜破裂,以及红细胞聚合.
结论:
- 在BP100类似物中用氨酸替代氨酸可以增强抗菌活性.
- 通过C端化增加的疏水性降低了抗菌效果,增加了血液溶解活性.
- 这些发现为AMP的结构-活性关系提供了潜在的治疗方法.
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