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Apolipoprotein C-I Binds More Strongly to Phospholipid/Triolein/Water than Triolein/Water Interfaces: A Possible Model for Inhibiting Cholesterol Ester Transfer Protein Activity and Triacylglycerol-Rich Lipoprotein Uptake

Apolipoprotein C-I (apoC-I) is an important constituent of high-density lipoprotein (HDL) and is involved in the accumulation of cholesterol ester in nascent HDL via inhibition of cholesterol ester transfer protein and potential activation of lecithin:cholesterol acyltransferase (LCAT). As the smallest exchangeable apolipoprotein (57 residues), apoC-I transfers between lipoproteins via a lipid-binding motif of two amphipathic α-helices (AαHs), spanning residues 7–29 and 38–52. To understand apoC-I’s behavior at hydrophobic lipoprotein surfaces, oil drop tensiometry was used to compare the binding to triolein/water (TO/W) and palmitoyloleoylphosphatidylcholine/triolein/water (POPC/TO/W) interfaces. When apoC-I binds to either interface, the surface tension (γ) decreases by ∼16–18 mN/m. ApoC-I can be exchanged at both interfaces, desorbing upon compression and readsorbing on expansion. The maximal surface pressures at which apoC-I begins to desorb (Πmax) were 16.8 and 20.7 mN/m at TO/W and POPC/TO/W interfa...

Autoren:   Nathan L. Meyers; Libo Wang; Donald M. Small
Journal:   Biochemistry
Jahrgang:   2012
DOI:   10.1021/bi2015212
Erscheinungsdatum:   02.02.2012
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