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通过总频率生成来区分膜结合抗微生物的两种吸附模式通过

Chu Wang¹, Chenxi Hou¹, Jiayou Pu¹

¹State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.

Langmuir : the ACS journal of surfaces and colloids

|July 7, 2023

概括

抗微生物 (AMP) 通过静电或恐水力与细菌膜相互作用. 通过总频生成 (SFG) 光谱学来理解这些相互作用,有助于开发新的抗药耐药病原体的抗生素.

科学领域:

生物物理学的生物物理.
生物化学生物化学
材料科学材料科学材料科学

背景情况:

多药耐药 (MDR) 病原体构成了严重的全球健康威胁.
抗微生物 (AMP) 由于其广泛的活性,可以作为对抗MDR病原体的治疗方法.
阐明AMP的精确抗菌机制对于开发更有效的治疗方法至关重要.

研究的目的:

研究代表性AMP与模型脂质双层之间的相互作用机制.
在膜上区分各种AMP吸附模式.
建立一种方法来使用SFG光谱学对AMP和膜相互作用进行分类.

主要方法:

利用总频率生成 (SFG) 振动光谱来研究AMP-膜相互作用.
通过dDPPG/DPPG脂质双层模型研究了三个特定的AMP (马库拉丁1.1-G15,库皮宁1a和奥雷因1.2).
分析了基于静电和疏水相互作用的AMP吸附,有和没有反离子中和.

主要成果:

确定了两种不同的AMP吸附模式:松散吸附 (静电) 和密集吸附 (静电+疏水).
松散吸附的AMP在电静电荷中和后被脱离,由SFG信号的损失表明.
由于疏水性相互作用而导致的电荷中和后,密集吸附的AMP仍然保持结合,这是持续的SFG信号证实的.

结论:

使用SFG光谱学建立了一个可靠的协议,以对脂质双层上AMP吸附模式进行分类.
证明疏水性相互作用是稳定的AMP吸附的关键,即使在对静电力进行选后.
这种知识促进了基于AMP的高效抗菌剂的合理设计和开发.

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