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Antimicrobial peptides are postulated to disrupt microbial phospholipid membranes. The prevailing molecular model is based on the formation of stable or transient pores although the direct observation of the fundamental processes is lacking. By combining rational peptide design with topographical (atomic force microscopy) and chemical (nanoscale secondary ion mass spectrometry) imaging on the same samples, we show that pores formed by antimicrobial peptides in supported lipid bilayers are not necessarily limited to a particular diameter, nor they are transient, but can expand laterally at the nano-to-micrometer scale to the point of complete membrane disintegration. The results offer a mechanistic basis for membrane poration as a generic physicochemical process of cooperative and continuous peptide recruitment in the available phospholipid matrix.

Original publication

DOI

10.1073/pnas.1222824110

Type

Journal article

Journal

Proc Natl Acad Sci U S A

Publication Date

28/05/2013

Volume

110

Pages

8918 - 8923

Keywords

antibiotics, de novo protein design, innate host defense, nanometrology, nanoscopy, Amino Acid Sequence, Antimicrobial Cationic Peptides, Chromatography, High Pressure Liquid, Circular Dichroism, Lipid Bilayers, Magnetic Resonance Spectroscopy, Mass Spectrometry, Microscopy, Atomic Force, Molecular Dynamics Simulation, Molecular Sequence Data, Nanotechnology, Phospholipids, Protein Engineering, Spectrometry, Mass, Secondary Ion