NDLI: Direct imaging of salt effects on lipid bilayer ordering at sub-molecular resolution

Content Provider	Springer Nature Link
Author	Ferber, Urs M. Kaggwa, Gillian Jarvis, Suzanne P.
Copyright Year	2010
Abstract	The interactions of salts with lipid bilayers are known to alter the properties of membranes and therefore influence their structure and dynamics. Sodium and calcium cations penetrate deeply into the headgroup region and bind to the lipids, whereas potassium ions only loosely associate with lipid molecules and mostly remain outside of the headgroup region. We investigated a dipalmitoylphosphatidylcholine (DPPC) bilayer in the gel phase in the presence of all three cations with a concentration of Ca2+ ions an order of magnitude smaller than the Na+ and K+ ions. Our findings indicate that the area per unit cell does not significantly change in these three salt solutions. However the lipid molecules do re-order non-isotropically under the influence of the three different cations. We attribute this reordering to a change in the highly directional intermolecular interactions caused by a variation in the dipole-dipole bonding arising from a tilt of the headgroup out of the membrane plane. Measurements in different NaCl concentrations also show a non-isotropic re-ordering of the lipid molecules.
Starting Page	329
Ending Page	338
Page Count	10
File Format	PDF
ISSN	01757571
Journal	European Biophysics Journal
Volume Number	40
Issue Number	3
e-ISSN	14321017
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-12-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lipid model membranes Membrane-ion interactions Sodium cations Calcium cations Potassium cations Cell Biology Nanotechnology Neurobiology Biochemistry Membrane Biology Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Medicine Biophysics

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