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Biophysical implications of lipid bilayer rheometry for mechanosensitive channels
, Article Proceedings of the National Academy of Sciences of the United States of America ; Vol. 111, Issue. 38 , 2014 , Pages 13864-13869 ; Nakayama, Y ; Bavi, O ; Cox, C. D ; Qin, Q. H ; Martinac, B ; Sharif University of Technology
Abstract
The lipid bilayer plays a crucial role in gating of mechanosensitive (MS) channels. Hence it is imperative to elucidate the rheological properties of lipid membranes. Herein we introduce a framework to characterize the mechanical properties of lipid bilayers by combining micropipette aspiration (MA) with theoretical modeling. Our results reveal that excised liposome patch fluorometry is superior to traditional cell-attached MA for measuring the intrinsic mechanical properties of lipid bilayers. The computational results also indicate that unlike the uniform bilayer tension estimated by Laplace's law, bilayer tension is not uniform across the membrane patch area. Instead, the highest tension...