Abstract
The distribution of lecithin-cholesterol acyltransferase (LCAT) in human plasma was assessed by measuring both LCAT mass and activity in plasma fractions separated by sequential flotation ultracentrifugation, single-spin gradient ultracentrifugation, dextran sulfate-Mg 2+ precipitation or agarose gel filtration. Although most of the LCAT was found to be associated with the high density lipoprotein fraction, a small amount of active LCAT (approximately 1% of the plasma LCAT mass and activity) was consistently associated with the low density lipoprotein fraction. LCAT was not found in the very low density lipoprotein fraction. The LDL-associated LCAT may play an important role in the acylation of lysolecithin by lysolecithin acyltransferase activity of LCAT.
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