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The Two Faces of the Liquid Ordered Phase
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SYSNO ASEP 0554270 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The Two Faces of the Liquid Ordered Phase Author(s) Schachter, Itay (UOCHB-X)
Paananen, R. O. (FI)
Fábián, Balázs (UOCHB-X) ORCID
Jurkiewicz, Piotr (UFCH-W) RID, ORCID
Javanainen, Matti (UOCHB-X) RID, ORCIDSource Title Journal of Physical Chemistry Letters. - : American Chemical Society - ISSN 1948-7185
Roč. 13, č. 5 (2022), s. 1307-1313Number of pages 7 s. Language eng - English Country US - United States Keywords gel phase ; phospholipid bilayers ; molecular motion OECD category Physical chemistry R&D Projects GX19-26854X GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UOCHB-X - RVO:61388963 ; UFCH-W - RVO:61388955 UT WOS 000754489600020 EID SCOPUS 85124266895 DOI 10.1021/acs.jpclett.1c03712 Annotation Coexisting liquid ordered (Lo) and liquid disordered (Ld) lipid phases in synthetic and plasma membrane-derived vesicles are commonly used to model the heterogeneity of biological membranes, including their putative ordered rafts. However, raft-associated proteins exclusively partition to the Ld and not the Lo phase in these model systems. We believe that the difference stems from the different microscopic structures of the lipid rafts at physiological temperature and the Lo phase studied at room temperature. To probe this structural diversity across temperatures, we performed atomistic molecular dynamics simulations, differential scanning calorimetry, and fluorescence spectroscopy on Lo phase membranes. Our results suggest that raft-associated proteins are excluded from the Lo phase at room temperature due to the presence of a stiff, hexagonally packed lipid structure. This structure melts upon heating, which could lead to the preferential solvation of proteins by order-preferring lipids. This structural transition is manifested as a subtle crossover in membrane properties, yet, both temperature regimes still fulfill the definition of the Lo phase. We postulate that in the compositionally complex plasma membrane and in vesicles derived therefrom, both molecular structures can be present depending on the local lipid composition. These structural differences must be taken into account when using synthetic or plasma membrane-derived vesicles as a model for cellular membrane heterogeneity below the physiological temperature. Workplace Institute of Organic Chemistry and Biochemistry Contact asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Year of Publishing 2023 Electronic address https://doi.org/10.1021/acs.jpclett.1c03712
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