Charge, Hydrophobicity, and Lipid Type Drive Antimicrobial Peptides’ Unique Perturbation Ensembles

Authors:
Publisher website
Google Scholar
Abstract
Antimicrobial peptides (AMPs) have emerged as a promising solution to the escalating public health threat caused by multidrug-resistant bacteria. Although ongoing research efforts have established AMP's role in membrane permeabilization and leakage, the precise mechanisms driving these disruption patterns remain unclear. We leverage molecular dynamics (MD) simulations enhanced by membrane mimetic (HMMM) to systematically investigate how the physiochemical properties of magainin (+3) and pexiganan (+9) affect their localization, insertion, curvature perturbation, and membrane binding ensemble. Building on existing microbiology, NMR, circular dichroism, and fluorescence data, our analysis reveals that the lipid makeup is a key determinant in the binding dynamics and structural conformation of AMPs. We find that phospholipid type is crucial for peptide localization, demonstrated through magainin's predominant interaction with lipid tails and pexiganan's with polar headgroups in POPC/POPS membranes. The membrane curvature changes induced by pexiganan relative to magainin suggest that AMPs with larger charges have more potential in modulating bilayer bending. These insights advance our understanding of AMP-membrane interactions at the molecular level, offering guidance for the design of targeted antimicrobial therapies.
Funding Information
  • National Science Foundation Graduate Research Fellowship Program
  • Ford Foundation
  • National Heart, Lung, and Blood Institute (R35 HL135823)
  • National Institute of General Medical Sciences (R01 GM123455, R01-GM141298)
  • University of Illinois at Urbana-Champaign

This publication has 134 references indexed in Scilit: