Cholesterol Increases the Magnetic Aligning of Bicellar Disks from an Aqueous Mixture of DMPC and DMPE-DTPA with Complexed Thulium Ions
Identifieur interne : 000926 ( Main/Merge ); précédent : 000925; suivant : 000927Cholesterol Increases the Magnetic Aligning of Bicellar Disks from an Aqueous Mixture of DMPC and DMPE-DTPA with Complexed Thulium Ions
Auteurs : Marianne Liebi [Suisse] ; Joachim Kohlbrecher [Suisse] ; Takashi Ishikawa [Suisse] ; Peter Fischer [Suisse] ; Peter Walde [Suisse] ; Erich J. Windhab [Suisse]Source :
- Langmuir [ 0743-7463 ] ; 2012.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Disque.
English descriptors
- KwdEn :
Abstract
Aqueous mixtures of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine-diethylenetriamine pentaacetate (DMPE-DTPA) with complexed thulium ions (Tm3+), and cholesterol with varying molar ratio were studied at different temperatures in the presence and absence of a magnetic field. For mixtures without cholesterol weakly magnetically alignable small disks, so-called bicelles, are formed at temperatures below the phase transition temperature (5- 22 °C), as shown by cryo-transmission electron microscopy (cryoTEM) and small-angle neutron scattering (SANS). In presence of 16 mol % cholesterol the disk size and the magnetic alignability were larger within the entire temperature range studied (5-40 °C). Cholesterol acts as a spacer between DMPE-DTPA with complexed Tm3+, allowing these molecules to integrate more frequently into the planar part of the bicelles. Replacing DMPC partially by cholesterol thus lead to an increase in magnetic aligning by a higher amount of the magnetic handles (Tm3+ complexed to DMPE-DTPA) in the plane and by an increased number of phospholipids in the enlarged bicelles. The magnetic aligning was most pronounced at 5 °C. The temperature-dependent structural changes of the DMPC/cholesterol/DMPE-DTPA/Tm3+ aqueous mixtures are complex, including the transient appearance of holes in the disks at intermediate temperatures.
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Pascal:12-0335971Le document en format XML
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<author><name sortKey="Ishikawa, Takashi" sort="Ishikawa, Takashi" uniqKey="Ishikawa T" first="Takashi" last="Ishikawa">Takashi Ishikawa</name>
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<author><name sortKey="Fischer, Peter" sort="Fischer, Peter" uniqKey="Fischer P" first="Peter" last="Fischer">Peter Fischer</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cholesterol</term>
<term>Complexes</term>
<term>Disk</term>
<term>Ions</term>
<term>Magnetic field</term>
<term>Phase transitions</term>
<term>Phospholipid</term>
<term>Small angle neutron scattering</term>
<term>Thulium</term>
<term>Transients</term>
<term>Transition temperature</term>
<term>Transmission electron microscopy</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Cholestérol</term>
<term>Disque</term>
<term>Complexe</term>
<term>Thulium</term>
<term>Ion</term>
<term>Champ magnétique</term>
<term>Transition phase</term>
<term>Température transition</term>
<term>Microscopie électronique transmission</term>
<term>Diffusion neutron centrale</term>
<term>Phospholipide</term>
<term>Phénomène transitoire</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Disque</term>
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<front><div type="abstract" xml:lang="en">Aqueous mixtures of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine-diethylenetriamine pentaacetate (DMPE-DTPA) with complexed thulium ions (Tm<sup>3+</sup>
), and cholesterol with varying molar ratio were studied at different temperatures in the presence and absence of a magnetic field. For mixtures without cholesterol weakly magnetically alignable small disks, so-called bicelles, are formed at temperatures below the phase transition temperature (5- 22 °C), as shown by cryo-transmission electron microscopy (cryoTEM) and small-angle neutron scattering (SANS). In presence of 16 mol % cholesterol the disk size and the magnetic alignability were larger within the entire temperature range studied (5-40 °C). Cholesterol acts as a spacer between DMPE-DTPA with complexed Tm<sup>3+</sup>
, allowing these molecules to integrate more frequently into the planar part of the bicelles. Replacing DMPC partially by cholesterol thus lead to an increase in magnetic aligning by a higher amount of the magnetic handles (Tm<sup>3+</sup>
complexed to DMPE-DTPA) in the plane and by an increased number of phospholipids in the enlarged bicelles. The magnetic aligning was most pronounced at 5 °C. The temperature-dependent structural changes of the DMPC/cholesterol/DMPE-DTPA/Tm<sup>3+</sup>
aqueous mixtures are complex, including the transient appearance of holes in the disks at intermediate temperatures.</div>
</front>
</TEI>
<affiliations><list><country><li>Suisse</li>
</country>
</list>
<tree><country name="Suisse"><noRegion><name sortKey="Liebi, Marianne" sort="Liebi, Marianne" uniqKey="Liebi M" first="Marianne" last="Liebi">Marianne Liebi</name>
</noRegion>
<name sortKey="Fischer, Peter" sort="Fischer, Peter" uniqKey="Fischer P" first="Peter" last="Fischer">Peter Fischer</name>
<name sortKey="Ishikawa, Takashi" sort="Ishikawa, Takashi" uniqKey="Ishikawa T" first="Takashi" last="Ishikawa">Takashi Ishikawa</name>
<name sortKey="Kohlbrecher, Joachim" sort="Kohlbrecher, Joachim" uniqKey="Kohlbrecher J" first="Joachim" last="Kohlbrecher">Joachim Kohlbrecher</name>
<name sortKey="Walde, Peter" sort="Walde, Peter" uniqKey="Walde P" first="Peter" last="Walde">Peter Walde</name>
<name sortKey="Windhab, Erich J" sort="Windhab, Erich J" uniqKey="Windhab E" first="Erich J." last="Windhab">Erich J. Windhab</name>
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</record>
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