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><journal-meta><journal-id journal-id-type="nlm-ta">Biophys J</journal-id><journal-title>Biophysical Journal</journal-title><issn pub-type="ppub">0006-3495</issn><issn pub-type="epub">1542-0086</issn></journal-meta><article-meta><article-id pub-id-type="pmid">9591667</article-id><article-id pub-id-type="pmc">1299583</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Magnetically aligned phospholipid bilayers with positive ordering: a new model membrane system.</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Prosser</surname><given-names>R S</given-names></name></contrib><contrib contrib-type="author"><name><surname>Hwang</surname><given-names>J S</given-names></name></contrib><contrib contrib-type="author"><name><surname>Vold</surname><given-names>R R</given-names></name></contrib></contrib-group><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></pub-date><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></abstract></article-meta></front></pmc><affiliations><list></list><tree><noCountry><name sortKey="Hwang, J S" sort="Hwang, J S" uniqKey="Hwang J" first="J S" last="Hwang">J S Hwang</name><name sortKey="Prosser, R S" sort="Prosser, R S" uniqKey="Prosser R" first="R S" last="Prosser">R S Prosser</name><name sortKey="Vold, R R" sort="Vold, R R" uniqKey="Vold R" first="R R" last="Vold">R R Vold</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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