1. Academic Validation
  2. Dynamic assessment of bilayer thickness by varying phospholipid and hydraphile synthetic channel chain lengths

Dynamic assessment of bilayer thickness by varying phospholipid and hydraphile synthetic channel chain lengths

  • J Am Chem Soc. 2005 Jan 19;127(2):636-42. doi: 10.1021/ja044936+.
Michelle E Weber 1 Paul H Schlesinger George W Gokel
Affiliations

Affiliation

  • 1 Department of Molecular Biology and Pharmacology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA.
Abstract

A library of "hydraphile" synthetic ion channel analogues that differ in overall length from approximately 28-58 A has been prepared. A new and convenient ion-selective electrode (ISE) method was used to assay Na(+) release. Liposomes were formed from three different phospholipids: 1,2-dimyristoleoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), and 1,2-dierucoyl-sn-glycero-3-phosphocholine (DEPC). The acyl chains of the lipids comprise cis-unsaturated 14:1, 18:1, or 22:1 residues, respectively. Sodium release was measured for each Liposome system with each of the synthetic channels. Peak activity was observed for shorter channels in liposomes formed from DMPC and for longer channels in DEPC. A separate study was then conducted in DMPC liposomes in the presence of the putative membrane-thickening agents Cholesterol and decane. Peak activity was clearly shifted to longer channel lengths upon addition of 20 or 40 mol % Cholesterol or n-decane to the Liposome preparation.

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