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Enzymatic depolymerization of emulsan.

Y Shoham, E Rosenberg

    Journal of Bacteriology
    |October 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    An emulsan depolymerase enzyme breaks down the emulsan polymer, reducing its viscosity and emulsifying activity. This enzyme is an endoglycosidase, and higher emulsan molecular weight correlates with greater emulsifying power.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Polymer Science

    Background:

    • Emulsan is a potent polyanionic emulsifying agent produced by Acinetobacter calcoaceticus RAG-1.
    • Understanding emulsan's structure-function relationship is key to its applications.

    Purpose of the Study:

    • To characterize the enzyme responsible for emulsan depolymerization.
    • To elucidate the mechanism of emulsan degradation by this enzyme.
    • To investigate the relationship between emulsan molecular weight and its emulsifying activity.

    Main Methods:

    • Isolation and purification of an extracellular emulsan depolymerase from a soil bacterium (YUV-1).
    • Enzyme characterization including molecular weight estimation (89,000 Da).
    • Analysis of depolymerization products and reaction kinetics, including spectrophotometry and gel filtration.

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    Main Results:

    • The enzyme functions as an eliminase, cleaving glycosidic linkages in the emulsan backbone.
    • Deesterification reduces emulsan degradation rate by the enzyme.
    • Significant loss of viscosity and emulsifying activity occurs with minimal glycosidic bond breakage, indicating an endoglycosidase mechanism.
    • Higher molecular weight emulsan exhibits greater emulsifying activity.
    • Exhaustive digestion yields oligosaccharides with an average molecular weight of approximately 3,000 Da.

    Conclusions:

    • Emulsan depolymerase is an endoglycosidase that degrades emulsan.
    • The emulsifying activity of emulsan is directly related to its polymer molecular weight.
    • The enzyme's action provides insights into the structural basis of emulsan's functionality.