Line tension at fluid membrane domain boundaries measured by micropipette aspiration.
Line tension is a determinant of fluid phase domain formation kinetics and morphology in lipid bilayer membranes, which are models for biological membrane heterogeneity. We describe the first direct measurement of this line tension by micropipette aspiration. Our data are analyzed with a model that does not rely on independently measured (and composition dependent) secondary parameters, such as bending stiffness or membrane viscosities. Line tension is strongly composition dependent and decreases towards a critical consolute point in a quasiternary room temperature phase diagram.
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Aiwei
A
Tian
Corinne
C
Johnson
Wendy
W
Wang
Tobias
T
Baumgart
D002784:Cholesterol / Q000737:chemistry*; D008051:Lipid Bilayers / Q000737:chemistry*; D008560:Membrane Fluidity; D010713:Phosphatidylcholines / Q000737:chemistry*; D013109:Sphingomyelins / Q000737:chemistry*; D013500:Surface Tension; D014783:Viscosity
D008051:Lipid Bilayers; D010713:Phosphatidylcholines; D013109:Sphingomyelins; D002784:Cholesterol; C017251:1,2-oleoylphosphatidylcholine