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Related Experiment Videos

Lysozyme from the insect Ceratitis capitata eggs.

J M Fernandez-Sousa, J G Gavilanes, A M Municio

    European Journal of Biochemistry
    |January 3, 1977
    PubMed
    Summary

    This study characterizes the first insect lysozyme from Ceratitis capitata eggs, revealing unique properties compared to other animal lysozymes. It possesses distinct stability, activity, and amino acid composition, including a single tryptophan residue.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Insect Physiology

    Background:

    • Lysozymes are crucial enzymes found across various organisms, playing a role in immune defense.
    • Characterization of lysozymes from diverse sources, particularly insects, is essential for understanding their evolutionary and functional diversity.
    • Previous studies have focused on lysozymes from non-insect sources, leaving insect lysozymes largely uncharacterized.

    Purpose of the Study:

    • To purify and characterize lysozyme from the eggs of the dipterous insect Ceratitis capitata.
    • To investigate the physicochemical properties of this novel insect lysozyme.
    • To compare the properties of insect lysozyme with those of known animal and plant lysozymes.

    Main Methods:

    • Purification using ion-exchange chromatography and gel filtration.

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  • Physicochemical property analysis including molecular weight determination (gel electrophoresis) and stability studies.
  • Enzyme activity assays to determine the chitinase/muramidase specific activity ratio.

    • Main Results:

    • The purified insect lysozyme has a molecular weight of approximately 23,200 Da and a sedimentation coefficient of 2.4 S, composed of a single polypeptide chain.
    • The enzyme exhibits stability at acidic pH, lability at alkaline pH, with an optimal pH around 6.5.
    • A significantly higher chitinase/muramidase specific activity ratio (approx. 350x) was observed compared to hen egg-white lysozyme.
    • Unique amino acid composition including one tryptophan residue and glycine as the N-terminal residue was identified.

    Conclusions:

    • This work presents the first detailed characterization of an insect lysozyme, highlighting its unique biochemical and functional properties.
    • The distinct features, such as the presence of tryptophan and high specific activity, differentiate it from other known lysozymes.
    • The findings contribute to the broader understanding of lysozyme diversity and evolution across different taxa.