Dissociation of the lipid-enzyme complex of hormone-sensitive lipase using high density lipoprotein or apolipoprotein A-I

Abstract

Hormone-sensitive lipase in homogenates of adipose tissue occurs as a large, lipid-rich complex including several acylhydrolase activities that emerge quantitatively in the void volume on gel filtration chromatography (2% agarose). Incubation with intact human plasma high density lipoprotein or with lipidfree apolipoprotein A-I, however, disrupted the lipid-rich complex almost completely and most of the enzyme activity eluted from a 2% agarose column at about Ve = 2.3 × Vo. This use of the detergent-like properties of apolipo-protein A-I may be of value for dissociation of other lipid-associated or membrane-bound enzymes.