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Locations and Reorientations of Multi-Ring-Fused 2-Pyridones in Ganglioside G(M1) Micelles

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    0377559 - ÚFCH JH 2013 RIV US eng J - Journal Article
    Šachl, Radek - Rosenbaum, E. - Sellstedt, M. - Almqvist, F. - Johansson, L. B. A.
    Locations and Reorientations of Multi-Ring-Fused 2-Pyridones in Ganglioside G(M1) Micelles.
    Langmuir. Roč. 27, č. 5 (2011), s. 1662-1667. ISSN 0743-7463
    R&D Projects: GA ČR GAP208/10/1090
    Institutional research plan: CEZ:AV0Z40400503
    Keywords : direct energy transfer * fluorescent probe * polymer mycelles
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 4.186, year: 2011

    Fluorescent multi-ring-fused 2-pyridones, with chemical resemblance to other biologically active 2-pyridone systems, were solubilized in spherical micelles formed by the gangloiside Gm, and studied with respect to their spatial localization and rotational mobility. For this, electronic energy transfer between the multi-ring-fused 2-pyridone (donor) and BODIPY-FL-labeled G(M1) was determined, as well as their fluorescence depolarization. From the obtained efficiency of energy transfer to the acceptor group (BODIPY-FL), either localized in the polar or in the nonpolar part of the ganglioside, it has been possible to estimate the most likely localization of the multi-ring-fused 2-pyridones. The center of mass of the studied multi-ring-fused 2-pyridones are located at approximately 33 angstrom from the micellar center of mass, which corresponds to the internal hydrophobic hydrophilic interfacial region. At this location, the reorienting rates of the multi-ring-fused 2-pyridones are surprisingly slow with typical correlation times of 35-55 ns. No evidence was found for the formation of ground and excited state dimers, even when two monomers were forced to be near each other via a short covalent linker.
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