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Related Experiment Videos

Hepatic lipase. Purification and characterization.

J S Twu, A S Garfinkel, M C Schotz

    Biochimica Et Biophysica Acta
    |March 7, 1984
    PubMed
    Summary

    Researchers purified rat liver hepatic lipase, revealing it has four subunits. This enzyme hydrolyzes triacylglycerols, monoacylglycerols, and phospholipids, with activity modulated by apolipoprotein C-III.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Hepatic lipase is a key enzyme in lipid metabolism.
    • Understanding its structure and function is crucial for metabolic research.

    Purpose of the Study:

    • To purify and characterize rat liver hepatic lipase.
    • To investigate the substrate specificity and kinetic properties of the enzyme.
    • To explore the effects of apolipoproteins on hepatic lipase activity.

    Main Methods:

    • Purification of hepatic lipase from rat liver homogenates.
    • SDS-polyacrylamide gel electrophoresis for molecular weight determination.
    • Enzyme kinetics assays using triacylglycerol, monoacylglycerol, and phospholipid substrates.
    • Inhibition studies with diisopropylfluorophosphate and apolipoproteins C-II, C-I, and C-III.

    Main Results:

    • Hepatic lipase was purified to homogeneity, showing a native molecular weight of 200,000 Da and a subunit molecular weight of 53,000 Da.
    • The enzyme exhibited optimal activity at pH 8.5 for all tested substrates.
    • Competitive inhibition between triolein and monoolein hydrolysis suggests a common active site.
    • Apolipoprotein C-III inhibited triacylglycerol hydrolysis, while C-II and C-I had no effect.

    Conclusions:

    • Rat liver hepatic lipase is a tetrameric enzyme with broad substrate specificity.
    • The enzyme's activity is differentially regulated by specific apolipoproteins.
    • Further research into hepatic lipase function can inform metabolic disease understanding.

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