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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
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Membrane Permeabilization Mechanisms.

Katsumi Matsuzaki1

  • 1Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan. mkatsumi@pharm.kyoto-u.ac.jp.

Advances in Experimental Medicine and Biology
|April 14, 2019
PubMed
Summary

Antimicrobial peptides kill microbes by disrupting cell membranes. This review explores peptide-membrane interactions, permeabilization mechanisms like the toroidal pore model, and differences between bacterial and mammalian membrane disruption.

Keywords:
Barrel-stave modelCarpet modelMembrane bindingMembrane curvatureMembrane permeabilizationToroidal pore model

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Biophysics

Background:

  • Antimicrobial peptides (AMPs) are crucial in innate immunity.
  • AMPs are widely believed to exert their antimicrobial effects by disrupting microbial cell membranes.

Purpose of the Study:

  • To summarize the fundamental principles of antimicrobial peptide-membrane interactions.
  • To review established and proposed mechanisms by which AMPs permeabilize lipid bilayers.
  • To differentiate the modes of AMP action on bacterial versus mammalian membranes.

Main Methods:

  • Literature review and synthesis of existing research on antimicrobial peptides and membrane biophysics.
  • Analysis of theoretical models describing peptide-lipid interactions.
  • Comparative analysis of studies investigating AMP effects on different membrane types.

Main Results:

  • Peptide binding to membranes is driven by electrostatic and hydrophobic interactions.
  • Key mechanisms of lipid bilayer permeabilization include the barrel-stave, toroidal pore, and carpet models.
  • Distinct modes of permeabilization are observed for bacterial and mammalian membranes, influencing selectivity.

Conclusions:

  • Understanding AMP-membrane interactions is key to developing novel antimicrobial therapies.
  • The diverse mechanisms of membrane permeabilization highlight the complexity of AMP activity.
  • Differential effects on bacterial and mammalian membranes offer potential for targeted antimicrobial strategies.