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The Activation Of Lipoprotein Lipase By Apolipoprotein C-II
Funder
National Health and Medical Research Council
Funding Amount
$250,500.00
Summary
Abnormalities in blood lipid levels are common in our society. Treatment of these conditions adds a heavy burden to national health-care costs. Lipoprotein lipase is a plasma enzyme that plays a central role in maintaining safe blood lipid levels. The action of lipoprotein lipase in subjects on a western diet leads to the hydrolysis of about 150g of plasma triacylglycerol daily. Naturally occurring mutations in lipoprotein lipase, associated with a complete loss of enzyme activity, result in a h ....Abnormalities in blood lipid levels are common in our society. Treatment of these conditions adds a heavy burden to national health-care costs. Lipoprotein lipase is a plasma enzyme that plays a central role in maintaining safe blood lipid levels. The action of lipoprotein lipase in subjects on a western diet leads to the hydrolysis of about 150g of plasma triacylglycerol daily. Naturally occurring mutations in lipoprotein lipase, associated with a complete loss of enzyme activity, result in a high blood-lipids that can lead to premature atherosclerosis. Regulation of lipoprotein lipase occurs via an interaction with the regulatory protein apolipoprotein C-II. Individuals with apolipoprotein C-II deficiency also exhibit abnormal plasma lipid levels with an associated increased risk of coronary heart disease. These considerations demonstrate that the activation of lipoprotein lipase by apolipoprotein C-II is pivotal to the maintenance of normal blood lipid levels. The present proposal will establish the structure and orientation of apolipoprotein C-II in a lipid environment and provide a structural model for the activation of lipoprotein lipase by apolipoprotein C-II. These molecular details will serve as a model for the regulatory interactions of other apolipoproteins within lipoprotein particles and will generate leads for the development of new strategies for the treatment of blood lipid irregularities.Read moreRead less