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Single-molecule visualization of dynamic transitions of pore-forming peptides among multiple transmembrane positions.


ABSTRACT: Research on the dynamics of single-membrane proteins remains underdeveloped due to the lack of proper approaches that can probe in real time the protein's insertion depth in lipid bilayers. Here we report a single-molecule visualization method to track both vertical insertion and lateral diffusion of membrane proteins in supported lipid bilayers by exploiting the surface-induced fluorescence attenuation (SIFA) of fluorophores. The attenuation follows a d(-4) dependency, where d is the fluorophore-to-surface distance. The method is validated by observing the antimicrobial peptide LL-37 to transfer among five transmembrane positions: the surface, the upper leaflet, the centre, the lower leaflet and the bottom of the lipid bilayer. These results demonstrate the power of SIFA to study protein-membrane interactions and provide unprecedented in-depth understanding of molecular mechanisms of the insertion and translocation of membrane proteins.

SUBMITTER: Li Y 

PROVIDER: S-EPMC5056435 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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Single-molecule visualization of dynamic transitions of pore-forming peptides among multiple transmembrane positions.

Li Ying Y   Qian Zhenyu Z   Ma Li L   Hu Shuxin S   Nong Daguan D   Xu Chunhua C   Ye Fangfu F   Lu Ying Y   Wei Guanghong G   Li Ming M  

Nature communications 20160930


Research on the dynamics of single-membrane proteins remains underdeveloped due to the lack of proper approaches that can probe in real time the protein's insertion depth in lipid bilayers. Here we report a single-molecule visualization method to track both vertical insertion and lateral diffusion of membrane proteins in supported lipid bilayers by exploiting the surface-induced fluorescence attenuation (SIFA) of fluorophores. The attenuation follows a d<sup>-4</sup> dependency, where d is the f  ...[more]

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