Add time:08/28/2019         Source:sciencedirect.com

Electrochemical scanning tunneling microscopy (EC-STM) was employed to study the aggregation of trichogin OMe (TCG), an antimicrobial peptide, incorporated into a lipid monolayer. High-resolution EC-STM images show that trichogin molecules aggregate to form channels in the lipid monolayer. Two types of aggregates were observed in the images. The first consisted of a bundle of six TCG molecules surrounding a central pore. The structure and dimensions of this channel are similar to aggregates that in bilayers are described by the barrel-stave model. The EC-STM images also reveal that channels aggregate further to form a hexagonal lattice of a two dimensional (2D) nanocrystal. The model of 2D lattice was built from trimers of TCG molecules that alternatingly are oriented with either hydrophilic or hydrophobic faces to each other. In this way each TCG molecule is oriented partially with its hydrophilic face towards the hexameric pore allowing the formation of the column of water inside this pore.

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