Homogeneous hybrid droplet interface bilayers assembled from binary mixtures of DPhPC phospholipids and PB-b-PEO diblock copolymers
Journal
Biochimica et Biophysica Acta - Biomembranes
Journal Volume
1864
Journal Issue
10
Start Page
183997
ISSN
00052736
Date Issued
2022
Author(s)
Koner, Subhadeep
Tawfik, Joseph
Mashali, Farzin
Kennison, Kristen B.
McClintic, William T.
Heberle, Frederick A.
Kumar, Manish
Sarles, Stephen A.
Abstract
Hybrid membranes built from phospholipids and amphiphilic block copolymers seek to capitalize on the benefits of both constituents for constructing biomimetic interfaces with improved performance. However, hybrid membranes have not been formed or studied using the droplet interface bilayer (DIB) method, an approach that offers advantages for revealing nanoscale changes in membrane structure and mechanics and offers a path toward assembling higher-order tissues. We report on hybrid droplet interface bilayers (hDIBs) formed in hexadecane from binary mixtures of synthetic diphytanoyl phosphatidylcholine (DPhPC) lipids and low molecular weight 1,2 polybutadiene-b-polyethylene oxide (PBPEO) amphiphilic block copolymers and use electrophysiology measurements and imaging to assess the effects of PBPEO in the membrane. This work reveals that hDIBs containing up to 15 mol% PBPEO plus DPhPC are homogeneously mixtures of lipids and polymers, remain highly resistive to ion transport, and are stable—including under applied voltage. Moreover, they exhibit hydrophobic thicknesses similar to DPhPC-only bilayers, but also have significantly lower values of membrane tension. These characteristics coincide with reduced energy of adhesion between droplets and the formation of alamethicin ion channels at significantly lower threshold voltages, demonstrating that even moderate amounts of amphiphilic block copolymers in a lipid bilayer provide a route for tuning the physical properties of a biomimetic membrane. © 2022 Elsevier B.V.
Subjects
Alamethicin
Diblock copolymer
Diphythanoyl phosphatidylcholine (DPhPC)
Droplet interface bilayer
Hybrid membrane
Polybutadiene-b-polyethylene oxide (PBPEO)
SDGs
Publisher
Elsevier B.V.
Description
論文編號: 183997
Type
journal article