Pašalić, Lea; Maleš, Petra; Čikoš, Ana; Pem, Barbara; Bakarić, Danijela (2024) The rise of FTIR spectroscopy in the characterization of asymmetric lipid membranes. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 305 . ISSN 1386-1425
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Abstract
In contrast to symmetric unilamellar liposomes (sLUVs) prepared from a mixture of different lipids, asymmetric ones (aLUVs) with different lipid composition in the inner and outer membrane leaflets are more suitable model systems of eukaryotic plasma membranes. However, apart from the challenging preparation of asymmetric liposomes and small amounts of obtained asymmetric unilamellar liposomes (aLUVs), a major drawback is the qualitative characterization of asymmetry, as each of the techniques used so far has certain limitations. In this regard, we prepared aLUVs composed dominantly of DPPC(out)/DPPS(in) lipids and, along with 1H NMR and DSC characterization, we showed for the first time how FTIR spectroscopy can be used in the presence of (a)symmetry between DPPC/DPPS lipid bilayers. Using second derivative FTIR spectra we demonstrated not only that the hydration of lipids glycerol backbone and choline moiety of DPPC differs in s/aLUVs, but in addition that the lateral interactions between hydrocarbon chains during the phase change display different trend in s/aLUVs. Molecular dynamics simulations confirmed different chain ordering and packing between s/a bilayers, with a significant influence of temperature, i.e. membrane phase.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC); 1,2-dipalmitoyl-sn-glycero-3-phosphoserine (DPPS); asymmetric large unilamellar liposomes (LUVs); 1H NMR and FTIR spectroscopy, differential scanning calorimetry (DSC); molecular dynamics (MD) simulations | ||||||||
| Subjects: | NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Chemistry > Physical Chemistry |
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| Divisions: | Division of Organic Chemistry and Biochemistry NMR Center |
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| Depositing User: | Danijela Bakarić | ||||||||
| Date Deposited: | 21 Nov 2024 08:49 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/9300 | ||||||||
| DOI: | 10.1016/j.saa.2023.123488 |
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