Antimicrobial peptide cWFW kills by combining lipid phase separation with autolysis.

Abstract:

:The synthetic cyclic hexapeptide cWFW (cyclo(RRRWFW)) has a rapid bactericidal activity against both Gram-positive and Gram-negative bacteria. Its detailed mode of action has, however, remained elusive. In contrast to most antimicrobial peptides, cWFW neither permeabilizes the membrane nor translocates to the cytoplasm. Using a combination of proteome analysis, fluorescence microscopy, and membrane analysis we show that cWFW instead triggers a rapid reduction of membrane fluidity both in live Bacillus subtilis cells and in model membranes. This immediate activity is accompanied by formation of distinct membrane domains which differ in local membrane fluidity, and which severely disrupts membrane protein organisation by segregating peripheral and integral proteins into domains of different rigidity. These major membrane disturbances cause specific inhibition of cell wall synthesis, and trigger autolysis. This novel antibacterial mode of action holds a low risk to induce bacterial resistance, and provides valuable information for the design of new synthetic antimicrobial peptides.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Scheinpflug K,Wenzel M,Krylova O,Bandow JE,Dathe M,Strahl H

doi

10.1038/srep44332

subject

Has Abstract

pub_date

2017-03-09 00:00:00

pages

44332

issn

2045-2322

pii

srep44332

journal_volume

7

pub_type

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