Interfacial tension and surface pressure of high density lipoprotein, low density lipoprotein, and related lipid droplets.
(2012) In Biophysical Journal 103(6). p.1236-1244- Abstract
- Lipid droplets play a central role in energy storage and metabolism on a cellular scale. Their core is comprised of hydrophobic lipids covered by a surface region consisting of amphiphilic lipids and proteins. For example, high and low density lipoproteins (HDL and LDL, respectively) are essentially lipid droplets surrounded by specific proteins, their main function being to transport cholesterol. Interfacial tension and surface pressure of these particles are of great interest because they are related to the shape and the stability of the droplets and to protein adsorption at the interface. Here we use coarse-grained molecular-dynamics simulations to consider a number of related issues by calculating the interfacial tension in... (More)
- Lipid droplets play a central role in energy storage and metabolism on a cellular scale. Their core is comprised of hydrophobic lipids covered by a surface region consisting of amphiphilic lipids and proteins. For example, high and low density lipoproteins (HDL and LDL, respectively) are essentially lipid droplets surrounded by specific proteins, their main function being to transport cholesterol. Interfacial tension and surface pressure of these particles are of great interest because they are related to the shape and the stability of the droplets and to protein adsorption at the interface. Here we use coarse-grained molecular-dynamics simulations to consider a number of related issues by calculating the interfacial tension in protein-free lipid droplets, and in HDL and LDL particles mimicking physiological conditions. First, our results suggest that the curvature dependence of interfacial tension becomes significant for particles with a radius of ∼5 nm, when the area per molecule in the surface region is <1.4 nm(2). Further, interfacial tensions in the used HDL and LDL models are essentially unaffected by single apo-proteins at the surface. Finally, interfacial tensions of lipoproteins are higher than in thermodynamically stable droplets, suggesting that HDL and LDL are kinetically trapped into a metastable state. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3123826
- author
- Ollila, Samuli LU ; Lamberg, Antti ; Lehtivaara, Maria ; Koivuniemi, Artturi and Vattulainen, Ilpo
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Biophysical Journal
- volume
- 103
- issue
- 6
- pages
- 1236 - 1244
- publisher
- Cell Press
- external identifiers
-
- wos:000309017800016
- pmid:22995496
- scopus:84866514776
- pmid:22995496
- ISSN
- 1542-0086
- DOI
- 10.1016/j.bpj.2012.08.023
- language
- English
- LU publication?
- yes
- id
- 7c8e4f6d-b294-44de-81fa-26389bab7e1d (old id 3123826)
- date added to LUP
- 2016-04-01 10:40:16
- date last changed
- 2022-04-04 20:11:11
@article{7c8e4f6d-b294-44de-81fa-26389bab7e1d, abstract = {{Lipid droplets play a central role in energy storage and metabolism on a cellular scale. Their core is comprised of hydrophobic lipids covered by a surface region consisting of amphiphilic lipids and proteins. For example, high and low density lipoproteins (HDL and LDL, respectively) are essentially lipid droplets surrounded by specific proteins, their main function being to transport cholesterol. Interfacial tension and surface pressure of these particles are of great interest because they are related to the shape and the stability of the droplets and to protein adsorption at the interface. Here we use coarse-grained molecular-dynamics simulations to consider a number of related issues by calculating the interfacial tension in protein-free lipid droplets, and in HDL and LDL particles mimicking physiological conditions. First, our results suggest that the curvature dependence of interfacial tension becomes significant for particles with a radius of ∼5 nm, when the area per molecule in the surface region is <1.4 nm(2). Further, interfacial tensions in the used HDL and LDL models are essentially unaffected by single apo-proteins at the surface. Finally, interfacial tensions of lipoproteins are higher than in thermodynamically stable droplets, suggesting that HDL and LDL are kinetically trapped into a metastable state.}}, author = {{Ollila, Samuli and Lamberg, Antti and Lehtivaara, Maria and Koivuniemi, Artturi and Vattulainen, Ilpo}}, issn = {{1542-0086}}, language = {{eng}}, number = {{6}}, pages = {{1236--1244}}, publisher = {{Cell Press}}, series = {{Biophysical Journal}}, title = {{Interfacial tension and surface pressure of high density lipoprotein, low density lipoprotein, and related lipid droplets.}}, url = {{http://dx.doi.org/10.1016/j.bpj.2012.08.023}}, doi = {{10.1016/j.bpj.2012.08.023}}, volume = {{103}}, year = {{2012}}, }