Activation of acyl-CoA cholesterol acyltransferase: redistribution in microsomal fragments of cholesterol and its facilitated movement by methyl-beta-cyclodextrin.

Abstract:

:Acyl-CoA cholesterol acyltransferase (ACAT) (EC 2.3.1.26) in the yolk sac membrane of chicken eggs plays an important role in the transport of lipids, which serve as both structural components and as an energy source during embryogenesis. ACAT from the yolk sac membrane of chicken eggs 16 d after fertilization has higher activity and better stability than its mammalian liver counterpart. During our study of the avian enzyme, ACAT was found to be activated up to twofold during storage at 4 degrees C. The activation was investigated, and data suggest that redistribution of cholesterol within microsomal vesicles leads to the increase. Methyl-beta-cyclodextrin (MbetaCD) increases activation an additional twofold, possibly by facilitating the movement of cholesterol within microsomal fragments and allowing redistribution of cholesterol in lipid bilayers to a greater extent. Treatment of microsomes with MbetaCD removes cholesterol from the membranes. Controlled amounts of cholesterol can be restored to the membranes by mixing them with cholesterol-phosphatidylcholine liposomes in the presence of MbetaCD. Under these conditions, the plot of ACAT vs. cholesterol mole fraction in the liposomes is sigmoidal. The finding that MbetaCD can enhance cholesterol transfer between liposomes and microsomes and reduce the limitation of slow movement of nonpolar molecules in aqueous media should make cyclodextrins more useful in in vitro studies of apolar molecule transport between membrane vesicles.

journal_name

Lipids

journal_title

Lipids

authors

Cheng D,Tipton CL

doi

10.1007/s11745-999-0362-z

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

261-8

issue

3

eissn

0024-4201

issn

1558-9307

journal_volume

34

pub_type

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