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Related Experiment Videos

Acyltransferase activities in rat lung microsomes.

H Hasegawa-Sasaki, K Ohno

    Biochimica Et Biophysica Acta
    |March 24, 1975
    PubMed
    Summary

    Rat lung microsomes contain at least two distinct acyltransferases. One enzyme prefers palmitoyl-CoA, while another shows specificity for arachidonoyl-CoA, suggesting different roles in phospholipid synthesis.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Enzymology

    Background:

    • Acyl-CoA:1-acyl-sn-glycero-3-phosphorylcholine acyltransferase activity is crucial for phospholipid metabolism in lung microsomes.
    • Understanding the specificities of these enzymes is key to elucidating pathways of lecithin formation.

    Purpose of the Study:

    • To characterize the kinetic properties and substrate specificities of acyltransferases involved in acyl-CoA incorporation into 1-acylglycerophosphorylcholine in rat lung microsomes.
    • To differentiate between potential acyltransferase activities based on their kinetic parameters and responses to various acyl-CoA substrates.

    Main Methods:

    • Enzymatic assays were performed on rat lung microsomes to measure the activity of acyl-CoA:1-acyl-sn-glycero-3-phosphorylcholine acyltransferase.
    • Kinetic parameters (Km, Vmax) and activation energies were determined for different acyl-CoA substrates.
    • The effect of various acyl-CoA additions on enzyme activity was assessed to determine substrate specificity.

    Main Results:

    • Two distinct acyltransferase activities were identified: palmitoyl-CoA:1-acylglycerophosphorylcholine acyltransferase and arachidonoyl-CoA:1-acylglycerophosphorylcholine acyltransferase.
    • Palmitoyl-CoA activity exhibited low Km, low Vmax, and low activation energy, and was inhibited by other acyl-CoAs.
    • Arachidonoyl-CoA activity showed high Km, high Vmax, and high activation energy, with high substrate specificity for polyenoyl-CoAs, particularly arachidonoyl-CoA, and was less affected by other acyl-CoAs.

    Conclusions:

    • Rat lung microsomes possess at least two acyltransferases with distinct kinetic properties and substrate preferences.
    • The palmitoyl-CoA:1-acylglycerophosphorylcholine acyltransferase does not appear to be the primary enzyme in the formation of dipalmitoyllecithin in the lung.
    • The findings suggest specialized roles for different acyltransferases in lung phospholipid synthesis, particularly highlighting the specificity of arachidonoyl-CoA incorporation.

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