Magnetically aligned phospholipid bilayers with positive ordering: a new model membrane system.
Identifieur interne : 000375 ( Pmc/Checkpoint ); précédent : 000374; suivant : 000376Magnetically aligned phospholipid bilayers with positive ordering: a new model membrane system.
Auteurs : R S Prosser ; J S Hwang ; R R VoldSource :
- Biophysical Journal [ 0006-3495 ] ; 1998.
Abstract
A stable smectic phospholipid bilayer phase aligned with the director parallel to the magnetic field can be generated by the addition of certain trivalent paramagnetic lanthanide ions to a bicellar solution of dimyristoylphosphatidylcholine (DMPC) and dihexanoylphosphatidylcholine (DHPC) in water. Suitable lanthanide ions are those with positive anisotropy of their magnetic susceptibility, namely Eu3+, Er3+, Tm3+, and Yb3+. For samples doped with Tm3+, this phase extends over a wide range of Tm3+ concentrations (6-40 mM) and temperatures (35-90 degrees C) and appears to undergo a transition from a fluid nematic discotic to a fluid, but highly ordered, smectic phase at a temperature that depends on the thulium concentration. As a membrane mimetic, these new, positively ordered phospholipid phases have high potential for structural studies using a variety of techniques such as magnetic resonance (EMR and NMR), small-angle x-ray and neutron diffraction, as well as optical and infrared spectroscopy.
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PubMed: 9591667
PubMed Central: 1299583
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<front><div type="abstract" xml:lang="en"><p>A stable smectic phospholipid bilayer phase aligned with the director parallel to the magnetic field can be generated by the addition of certain trivalent paramagnetic lanthanide ions to a bicellar solution of dimyristoylphosphatidylcholine (DMPC) and dihexanoylphosphatidylcholine (DHPC) in water. Suitable lanthanide ions are those with positive anisotropy of their magnetic susceptibility, namely Eu3+, Er3+, Tm3+, and Yb3+. For samples doped with Tm3+, this phase extends over a wide range of Tm3+ concentrations (6-40 mM) and temperatures (35-90 degrees C) and appears to undergo a transition from a fluid nematic discotic to a fluid, but highly ordered, smectic phase at a temperature that depends on the thulium concentration. As a membrane mimetic, these new, positively ordered phospholipid phases have high potential for structural studies using a variety of techniques such as magnetic resonance (EMR and NMR), small-angle x-ray and neutron diffraction, as well as optical and infrared spectroscopy.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Biophys J</journal-id>
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<title-group><article-title>Magnetically aligned phospholipid bilayers with positive ordering: a new model membrane system.</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Prosser</surname>
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<contrib contrib-type="author"><name><surname>Vold</surname>
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<aff>Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92093-0359, USA.</aff>
<pub-date pub-type="ppub"><month>5</month>
<year>1998</year>
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<volume>74</volume>
<issue>5</issue>
<fpage>2405</fpage>
<lpage>2418</lpage>
<abstract><p>A stable smectic phospholipid bilayer phase aligned with the director parallel to the magnetic field can be generated by the addition of certain trivalent paramagnetic lanthanide ions to a bicellar solution of dimyristoylphosphatidylcholine (DMPC) and dihexanoylphosphatidylcholine (DHPC) in water. Suitable lanthanide ions are those with positive anisotropy of their magnetic susceptibility, namely Eu3+, Er3+, Tm3+, and Yb3+. For samples doped with Tm3+, this phase extends over a wide range of Tm3+ concentrations (6-40 mM) and temperatures (35-90 degrees C) and appears to undergo a transition from a fluid nematic discotic to a fluid, but highly ordered, smectic phase at a temperature that depends on the thulium concentration. As a membrane mimetic, these new, positively ordered phospholipid phases have high potential for structural studies using a variety of techniques such as magnetic resonance (EMR and NMR), small-angle x-ray and neutron diffraction, as well as optical and infrared spectroscopy.</p>
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