期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
卷 1848, 期 2, 页码 422-432出版社
ELSEVIER
DOI: 10.1016/j.bbamem.2014.10.032
关键词
Time-dependent fluorescence shift; Molecular dynamics simulations; Cholesterol-mimicking detergents; Laurdan; DPH; Dynamic light scattering
资金
- Academy of Finland (the Finland Distinguished Professor (FiDiPro) program [263410]
- Academy of Finland (Centre of Excellence) [272130]
- Czech Science Foundation [P208/12/G016]
- Academy of Sciences
- European Research Council
- CSC-IT Center for Science (Espoo, Finland) [tty3995]
- Academy of Finland (AKA) [263410, 263410] Funding Source: Academy of Finland (AKA)
Cholesteryl hemisuccinate (CHS) is one of the cholesterol-mimicking detergents not observed in nature. It is, however, widely used in protein crystallography, in biochemical studies of proteins, and in pharmacology. Here, we performed an extensive experimental and theoretical study on the behavior of CHS in lipid membranes rich in unsaturated phospholipids. We found that the deprotonated form of CHS (that is the predominant form under physiological conditions) does not mimic cholesterol very well. The protonated form of CHS does better in this regard, but also its ability to mimic the physical effects of cholesterol on lipid membranes is limited. Overall, although ordering and condensing effects characteristic to cholesterol are present in systems containing any form of CHS, their strength is appreciably weaker compared to cholesterol. Based on the considerable amount of experimental and atomistic simulation data, we conclude that these differences originate from the fact that the ester group of CHS does not anchor it in an optimal position at the water-membrane interface. The implications of these findings for considerations of protein-cholesterol interactions are briefly discussed. (C) 2014 Elsevier B.V. All rights reserved.
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