Pore formation in a binary giant vesicle induced by cone-shaped lipids

Yuka Sakuma, Takashi Taniguchi, Masayuki Imai

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

We have investigated shape deformations of binary giant unilamellar vesicles (GUVs) composed of cone- and cylinder-shaped lipids. By coupling the spontaneous curvature of lipids with the phase separation, we demonstrated pore opening and closing in GUVs. When the temperature was set below the chain melting transition temperature of the cylindershaped lipid, the GUVs burst and then formed a single large pore, where the cone shape lipids form a cap at the edge of the bilayer to stabilize the pore. The pore closed when we increased the temperature above the transition temperature. The pore showed three types of shapes depending on the cone-shaped lipid concentration: simple circular, rolled-rim, and wrinkled-rim pores. These pore shape changes indicate that the distribution of the cone- and cylinder-shaped lipids is asymmetric between the inner and outer leaflets in the bilayer. We have proposed a theoretical model for a two-component membrane with an edge of bilayer where lipids can transfer between two leaflets. Using this model, we have reproduced numerically the observed shape deformations at the rim of pore.

Original languageEnglish
Pages (from-to)472-479
Number of pages8
JournalBiophysical Journal
Volume99
Issue number2
DOIs
Publication statusPublished - 2010 Jul 21
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics

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