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Effects of chelator lipids, paramagnetic metal ions and trehalose on liposomes by solid-state NMR.

The effects of various lipid bound paramagnetic metal ions on liposomes prepared in the presence of trehalose and chelator lipids are evaluated to observe site-specific signal changes on liposome samples with optimal resolution in solid-state NMR spectroscopy. We found that Mn2+ , Gd3+ and Dy3+ have different influences on the lipid 13 C sites depending on their penetration depths into the bilayer, which can be extracted as distance information. The trehalose-liposome mixture is efficiently packed into solid-state NMR rotors and provides optimal resolution at reasonable instrument temperatures (10-50 °C). The effectiveness and convenience of the trehalose preparation for studying a membrane protein in liposomes are demonstrated by a membrane sample with a model membrane peptide to show that trehalose is useful to prepare consistent and stable membrane protein liposome samples for solid-state NMR.

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