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Title: Electrophysiological interrogation of asymmetric droplet interface bilayers reveals surface-bound alamethicin induces lipid flip-flop

Journal Article · · Biochimica et Biophysica Acta. Biomembranes
 [1];  [1];  [1];  [2]; ORCiD logo [3];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. The Univ. of Georgia, Athens, GA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The droplet interface bilayer (DIB) method offers simple control over initial leaflet compositions in model membranes, enabling an experimental path to filling gaps in our knowledge about the interplay between compositional lipid asymmetry, membrane properties, and the behaviors of membrane-active species. Yet, the stability of lipid leaflet asymmetry in DIBs has received very little attention, particularly in the presence of peptides and ion channels that are often studied in DIBs. Herein, we demonstrate for the first time parallel, capacitance-based measurements of intramembrane potential with arrays of asymmetric DIBs assembled in a microfluidic device to characterize the stability of leaflet asymmetry over many hours in the presence and absence of membrane-active peptides. DIBs assembled from opposing monolayers of the ester (DPhPC) and ether (DOPhPC) forms of diphytanoyl-phosphatidylcholine yielded asymmetric bilayers with leaflet compositions that were stable for at least 18 has indicated by a stable |137 mV| intramembrane potential. In contrast, the addition of surface-bound alamethicin peptides caused a gradual, concentration-dependent decrease in the magnitude of the dipole potential difference. Intermittent current-voltage measurements revealed that alamethicin in asymmetric DIBs also shifts the threshold voltage required to drive peptide insertion and ion channel formation. These outcomes take place over the course of 1 to 5 h after membrane formation, and suggest that alamethicin peptides promote lipid flip-flop, even in the un-inserted, surface-bound state, by disordering lipids in the monolayer to which they bind. Furthermore, this methodology establishes the use of parallel electrophysiology for efficiently studying membrane asymmetry in arrays of DIBs.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1484993
Journal Information:
Biochimica et Biophysica Acta. Biomembranes, Vol. 1861, Issue 1; ISSN 0005-2736
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (4)

Photopolymerized microdomains in both lipid leaflets establish diffusive transport pathways across biomimetic membranes journal January 2019
Probing membrane protein properties using droplet interface bilayers journal May 2019
Accelerated Molecular Dynamics Applied to the Peptaibol Folding Problem journal August 2019
Measuring bilayer surface energy and curvature in asymmetric droplet interface bilayers journal November 2018

Figures / Tables (7)