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Endogenous basic protein phosphatases in the brain myelin.

S D Yang, J S Liu, Y L Fong

    Journal of Neurochemistry
    |January 1, 1987
    PubMed
    Summary
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    A latent protein phosphatase, identified as latent phosphatase 2, is the primary enzyme responsible for dephosphorylating brain myelin basic protein (MBP). This finding clarifies the key phosphatase involved in myelin regulation.

    Area of Science:

    • Neurochemistry
    • Enzymology
    • Myelin Biology

    Background:

    • Myelin basic protein (MBP) phosphorylation is crucial for myelin structure and function.
    • The specific phosphatases involved in myelin dephosphorylation remain incompletely understood.

    Purpose of the Study:

    • To identify the predominant phosphatase responsible for dephosphorylating brain myelin.
    • To characterize the activity and properties of endogenous myelin phosphatases.

    Main Methods:

    • Brain myelin was treated with freezing/thawing and 2-mercaptoethanol to stimulate phosphatase activity.
    • Chromatographic techniques (DEAE-cellulose, Sephadex G-200) were used to isolate and characterize the active enzyme.
    • The effect of purified latent phosphatase 2 on endogenous MBP phosphorylation was assessed.

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    Main Results:

    • Freezing/thawing in 2-mercaptoethanol significantly stimulated endogenous myelin phosphatase activity.
    • A high-molecular-weight latent phosphatase (350,000 MW), identified as latent phosphatase 2, was purified.
    • Latent phosphatase 2 effectively reversed endogenous MBP phosphorylation, unlike other tested phosphatases.

    Conclusions:

    • Latent phosphatase 2 is the predominant enzyme responsible for dephosphorylating brain myelin basic protein.
    • This enzyme plays a significant role in regulating myelin phosphorylation status.