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Interfacial properties of high-density lipoprotein-like lipid droplets with different lipid and apolipoprotein A-I compositions
VTT Bio- and Chemical Processes, Espoo, Finland.
VTT Bio- and Chemical Processes, Espoo, Finland.
Örebro University, School of Medical Sciences. VTT Bio- and Chemical Processes, Espoo, Finland.ORCID iD: 0000-0002-2856-9165
Physical Chemistry, Lund University, Lund, Sweden.
2013 (English)In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 104, no 10, p. 2193-2201, article id S0006-3495(13)00366-4Article in journal (Refereed) Published
Abstract [en]

The surface properties of high-density lipoproteins (HDLs) are important because different enzymes bind and carry out their functions at the surface of HDL particles during metabolic processes. However, the surface properties of HDL and other lipoproteins are poorly known because they cannot be directly measured for nanoscale particles with contemporary experimental methods. In this work, we carried out coarse-grained molecular dynamics simulations to study the concentration of core lipids in the surface monolayer and the interfacial tension of droplets resembling HDL particles. We simulated lipid droplets composed of different amounts of phospholipids, cholesterol esters (CEs), triglycerides (TGs), and apolipoprotein A-Is. Our results reveal that the amount of TGs in the vicinity of water molecules in the phospholipid monolayer is 25-50% higher compared to the amount of CEs in a lipid droplet with a mixed core of an equal amount of TG and CE. In addition, the correlation time for the exchange of molecules between the core and the monolayer is significantly longer for TGs compared to CEs. This suggests that the chemical potential of TG is lower in the vicinity of aqueous phase but the free-energy barrier for the translocation between the monolayer and the core is higher compared to CEs. From the point of view of enzymatic modification, this indicates that TG molecules are more accessible from the aqueous phase. Further, our results point out that CE molecules decrease the interfacial tension of HDL-like lipid droplets whereas TG keeps it constant while the amount of phospholipids varies.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 104, no 10, p. 2193-2201, article id S0006-3495(13)00366-4
National Category
Medical and Health Sciences Physical Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-63683DOI: 10.1016/j.bpj.2013.02.058ISI: 000319318400013PubMedID: 23708359Scopus ID: 2-s2.0-84878145911OAI: oai:DiVA.org:oru-63683DiVA, id: diva2:1169249
Note

Funding agencies:

Alfred Kordelin Foundation  

Magnus Ehrnrooth Foundation  

Oskar Huttunen Foundation  

Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-30Bibliographically approved

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Oresic, Matej

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