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  1. The Journal of Lipid Research
  2. Year: 2006 Volume: 47
  3. Year: 2006 Volume: 47 Issue: 2
  4. Swelling of phospholipids by monovalent salt.
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Swelling of phospholipids by monovalent salt.
Contribution of regulatory and structural variations in APOE to predicting dyslipidemia.
Year: 2006 Volume: 47 Issue: 1
Year: 2005 Volume: 46
Year: 2004 Volume: 45
Year: 2003 Volume: 44
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Swelling of phospholipids by monovalent salt.

Content Provider World Health Organization (WHO)-Global Index Medicus
Author Petrache, Horia I. Tristram-Nagle, Stephanie Harries, Daniel Kucerka, Norbert Nagle, John F. Parsegian, V. Adrian
Description Country affiliation: United States Author Affiliation: Petrache HI ( Laboratory of Physical and Structural Biology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-0924, USA. petrachh@mail.nih.gov)
Abstract Critical to biological processes such as membrane fusion and secretion, ion-lipid interactions at the membrane-water interface still raise many unanswered questions. Using reconstituted phosphatidylcholine membranes, we confirm here that multilamellar vesicles swell in salt solutions, a direct indication that salt modifies the interactions between neighboring membranes. By varying sample histories, and by comparing with data from ion carrier-containing bilayers, we eliminate the possibility that swelling is an equilibration artifact. Although both attractive and repulsive forces could be modified by salt, we show experimentally that swelling is driven primarily by weakening of the van der Waals attraction. To isolate the effect of salt on van der Waals interactions, we focus on high salt concentrations at which any possible electrostatic interactions are screened. By analysis of X-ray diffraction data, we show that salt does not alter membrane structure or bending rigidity, eliminating the possibility that repulsive fluctuation forces change with salt. By measuring changes in interbilayer separation with applied osmotic stress, we have determined, using the standard paradigm for bilayer interactions, that 1 M concentrations of KBr or KCl decrease the van der Waals strength by 50%. By weakening van der Waals attractions, salt increases energy barriers to membrane contact, possibly affecting cellular communication and biological signaling.
File Format HTM / HTML
ISSN 00222275
e-ISSN 15397262
Journal The Journal of Lipid Research
Issue Number 2
Volume Number 47
Language English
Publisher American Society for Biochemistry and Molecular Biology
Publisher Date 2006-02-01
Publisher Place United States
Access Restriction Open
Subject Keyword Discipline Biochemistry Anions Chemistry Phospholipids Algorithms Bromides Chlorides Dimyristoylphosphatidylcholine Lipid Bilayers Liposomes Models, Chemical Osmotic Pressure Phosphatidylcholines Static Electricity Thermodynamics X-ray Diffraction Research Support, N.i.h., Extramural Research Support, U.s. Gov't, Non-p.h.s.
Content Type Text
Resource Type Article
Subject Cell Biology Biochemistry Endocrinology
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