Time influence on the interaction between Cyt2Aa2 and lipid/cholesterol bilayers.

Abstract

Protein-membrane interactions are still an important topic of investigation. One of the suitable experimental techniques used by the scientific community to address such question is atomic force microscopy. In a previous work, we have reported that the binding mechanism between the cytolytic and antimicrobial protein (Cyt2Aa2) and lipid/cholesterol bilayers was concentration-dependent, leading to either the formation of holes in the bilayer or aggregates. Here we study such binding mechanism as a function of time at low protein concentrations (10 µg/mL). We demonstrate that although holes are formed during the first stages of the protein-lipid interaction, a reparation process due to molecular mobility in the bilayer leads to a homogenous and isotropic protein-lipid/cholesterol layer within 3 hr. The combination of imaging, force spectroscopy, and phase contrast delivered information about topography dynamics (molecular mobility), layer thickness, and mechanical properties of the protein-lipid/cholesterol system. These results highlight the importance of the observation time in (such type of) protein-lipid interactions (at low protein concentrations).

DOI: 10.1002/jemt.22736

Cite this paper

@article{MorenoCencerrado2016TimeIO, title={Time influence on the interaction between Cyt2Aa2 and lipid/cholesterol bilayers.}, author={Alberto Moreno-Cencerrado and Sudarat Tharad and Jagoba J Iturri and Boonhiang Promdonkoy and Chartchai Krittanai and Jos{\'e} L Toca-Herrera}, journal={Microscopy research and technique}, year={2016}, volume={79 11}, pages={1017-1023} }