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Related Experiment Videos

Tyrosinase as glycoprotein

K Miyazaki, N Otaki

    Archiv Fur Dermatologische Forschung
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Neuraminidase treatment of purified tyrosinase T1 retained catalytic activity but altered its electrophoretic mobility. These findings suggest mammalian tyrosinase is a glycoprotein.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Glycoprotein characterization

    Background:

    • Tyrosinase is a key enzyme in melanin biosynthesis.
    • The precise molecular structure and post-translational modifications of mammalian tyrosinase are not fully elucidated.

    Purpose of the Study:

    • To investigate the structural characteristics of purified mammalian tyrosinase (T1).
    • To determine if tyrosinase possesses glycoprotein properties.

    Main Methods:

    • Purified tyrosinase T1 was treated with neuraminidase.
    • Enzyme activity was assessed.
    • Disc electrophoresis was performed using Dopa staining (for activity), protein staining, and Periodic acid-Schiff (PAS) staining (for carbohydrates).

    Main Results:

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    • Neuraminidase treatment did not abolish tyrosinase catalytic activity.
    • Electrophoresis showed a shift in the Dopa-stained and protein-stained bands to a less anodic form, similar to tyrosinase T2.
    • PAS staining revealed that native tyrosinase T1, initially a single band, split into three slower-moving bands after neuraminidase treatment.
    • One PAS-stained band corresponded to the Dopa- and protein-stained bands, while the other two PAS-stained bands lacked peptide and enzymatic activity.
    • The total PAS-densitometric value remained consistent across the native and treated forms.

    Conclusions:

    • Mammalian tyrosinase T1 exhibits characteristics of a glycoprotein.
    • The observed electrophoretic shifts and the presence of carbohydrate moieties indicate glycosylation of tyrosinase.
    • Neuraminidase treatment affects the glycosylation pattern, potentially involving sialic acid residues.