高等学校化学学报 ›› 2026, Vol. 47 ›› Issue (7): 20250356.doi: 10.7503/cjcu20250356
收稿日期:2025-11-24
出版日期:2026-07-10
发布日期:2026-01-24
通讯作者:
蔡文生
E-mail:wscai@nankai.edu.cn
基金资助:
AN Yannan, SHAO Xueguang, CAI Wensheng(
)
Received:2025-11-24
Online:2026-07-10
Published:2026-01-24
Contact:
CAI Wensheng
E-mail:wscai@nankai.edu.cn
Supported by:摘要:
采用分子动力学模拟对比研究了抗菌肽Magainin和Indolicidin分别与革兰氏阴性菌和阳性菌膜的相互作用机制. 统计分析了两种肽的结构变化、 吸附过程、 对膜结构的扰动及其与膜的相互作用. 结果表明, Magainin在水相中螺旋结构较不稳定, 但在膜环境中可重新形成稳定的螺旋结构, 且在革兰氏阴性菌膜上 表现出更强的结合能力和更显著的膜扰动效应, 说明其对革兰氏阴性菌膜具有更高的选择性. 相比之下, Indolicidin始终保持柔性的无规卷曲结构, 通过快速吸附与膜表面稳定结合, 其作用机制以静电吸引和疏水作用协同为主, 但对革兰氏阴性菌膜和阳性菌膜的扰动均较小. 对比研究结果为理解Magainin对革兰氏阴性菌的选择性和Indolicidin的广谱性提供了理论依据.
中图分类号:
TrendMD:
安彦楠, 邵学广, 蔡文生. 抗菌肽Magainin和Indolicidin对革兰氏阴性菌和阳性菌膜的作用机制. 高等学校化学学报, 2026, 47(7): 20250356.
AN Yannan, SHAO Xueguang, CAI Wensheng. Mechanism of Action of Antimicrobial Peptides Magainin and Indolicidin on Gram-negative and Gram-positive Bacterial Membranes. Chem. J. Chinese Universities, 2026, 47(7): 20250356.
| System | AMP | Molecular assembly | Box size/nm3 | Simulation time/μs |
|---|---|---|---|---|
| 1 | Magainin | Water | 5.5×5.5×5.5 | 1 |
| 2 | Indolicidin | Water | 5.5×5.5×5.5 | 1 |
| 3 | Magainin | POPC/POPG(3∶1)⁃water | 5.5×5.5×12 | 2 |
| 4 | Magainin | POPC/POPG(5∶1)⁃water | 5.5×5.5×12 | 2 |
| 5 | Indolicidin | POPC/POPG(3∶1)⁃water | 5.5×5.5×12 | 2 |
| 6 | Indolicidin | POPC/POPG(5∶1)⁃water | 5.5×5.5×12 | 2 |
Table 1 Details of molecular assemblies investigated in this study
| System | AMP | Molecular assembly | Box size/nm3 | Simulation time/μs |
|---|---|---|---|---|
| 1 | Magainin | Water | 5.5×5.5×5.5 | 1 |
| 2 | Indolicidin | Water | 5.5×5.5×5.5 | 1 |
| 3 | Magainin | POPC/POPG(3∶1)⁃water | 5.5×5.5×12 | 2 |
| 4 | Magainin | POPC/POPG(5∶1)⁃water | 5.5×5.5×12 | 2 |
| 5 | Indolicidin | POPC/POPG(3∶1)⁃water | 5.5×5.5×12 | 2 |
| 6 | Indolicidin | POPC/POPG(5∶1)⁃water | 5.5×5.5×12 | 2 |
Fig.2 Contents of secondary structures at different moments(A, C) and secondary structures at key moments(B, D) of Magainin(A, B) and Indolicidin(C, D) in pure waterG: 3₁₀ helix, B: isolated β-bridge, C: coil, T: turn, E: extended strand, H: alpha helix.
Fig.4 Distances of Magainin(A, B) and Indolicidin(C, D) from center of Gram⁃negative(A, C) and Gram⁃positive(B, D) bacterial membranesMembrane center is defined as 0 nm, blue lines indicate hydrophobic fatty acid tail region of membrane, yellow spheres represent lipid head groups(indicating membrane surface), and peptides were initially located 2 nm away from membrane surface to allow folding and spontaneous adsorption. dav is average distance of peptide relative to membrane center in direction perpendicular to membrane surface over last 100 ns, smaller values indicate deeper membrane embedding.
Fig.5 Contents of secondary structures at different moments(A, C) and secondary structures at key moments(B, D) of Magainin on Gram⁃negative(A, B) and Gram⁃positive(C, D) bacterial membranesInitial structure of Magainin in membrane-peptide complex was structure at 50 ns of equilibrium simulation in pure water. G: 3₁₀ helix, B: isolated β-bridge, C: coil, T: turn, E: extended strand, H: alpha helix.
Fig.6 Contents of secondary structures at different moments(A, C) and secondary structures at key moments(B, D) of Indolicidin on Gram⁃negative(A, B) and Gram⁃positive(C, D) bacterial membranesInitial structure of Indolicidin in membrane-peptide complex was structure at 50 ns of equilibrium simulation in pure water. G: 3₁₀ helix, B: isolated β-bridge, C: coil, T: turn, E: extended strand, H: alpha helix.
Fig.7 Order parameter SCD of alkyl chain of membrane lipid POPC and POPG molecules of Magainin(A, B) and Indolicidin(C, D) with Gram⁃negative(A, C) and Gram⁃positive(B, D) bacteria
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