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https://hdl.handle.net/10316/113861
Title: | Fluorescent Probes cis- and trans-Parinaric Acids in Fluid and Gel Lipid Bilayers: A Molecular Dynamics Study | Authors: | Oliveira, Alexandre C. Filipe, Hugo A. L. Loura, Luís M. S. |
Keywords: | fluorescence spectroscopy; lipid membranes; membrane probe; molecular dynamics simulations | Issue Date: | 28-Feb-2023 | Publisher: | MDPI | Project: | This research was funded by the European Regional Development Fund, through COMPETE2020-Operational Program for Competitiveness and Internationalization, and Portuguese funds via FCT-Fundação para a Ciência e a Tecnologia, under projects UIDB/00313/2020 and UIDP/00313/2020 (Portugal). H.A.L.F. was funded by Programa Operacional Regional do Centro (CENTRO-04-3559-FSE-000162) within the European Social Fund (ESF). A.C.O. acknowledges FCT for the PhD grant SFRH/BD/120934/2016, funded through MCTES and also co-funded by EU through ESF, “Programa Operacional Regional Centro”. | Serial title, monograph or event: | Molecules | Volume: | 28 | Issue: | 5 | Abstract: | Fluorescence probes are indispensable tools in biochemical and biophysical membrane studies. Most of them possess extrinsic fluorophores, which often constitute a source of uncertainty and potential perturbation to the host system. In this regard, the few available intrinsically fluorescent membrane probes acquire increased importance. Among them, cis- and trans-parinaric acids (c-PnA and t-PnA, respectively) stand out as probes of membrane order and dynamics. These two compounds are long-chained fatty acids, differing solely in the configurations of two double bonds of their conjugated tetraene fluorophore. In this work, we employed all-atom and coarse-grained molecular dynamics simulations to study the behavior of c-PnA and t-PnA in lipid bilayers of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), representative of the liquid disordered and solid ordered lipid phases, respectively. All-atom simulations indicate that the two probes show similar location and orientation in the simulated systems, with the carboxylate facing the water/lipid interface and the tail spanning the membrane leaflet. The two probes establish interactions with the solvent and lipids to a similar degree in POPC. However, the almost linear t-PnA molecules have tighter lipid packing around them, especially in DPPC, where they also interact more with positively charged lipid choline groups. Probably for these reasons, while both probes show similar partition (assessed from computed free energy profiles across bilayers) to POPC, t-PnA clearly partitions more extensively than c-PnA to the gel phase. t-PnA also displays more hindered fluorophore rotation, especially in DPPC. Our results agree very well with experimental fluorescence data from the literature and allow deeper understanding of the behavior of these two reporters of membrane organization. | URI: | https://hdl.handle.net/10316/113861 | ISSN: | 1420-3049 | DOI: | 10.3390/molecules28052241 | Rights: | openAccess |
Appears in Collections: | I&D CNC - Artigos em Revistas Internacionais FCTUC Química - Artigos em Revistas Internacionais I&D CQC - Artigos em Revistas Internacionais FFUC- Artigos em Revistas Internacionais |
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