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Monoamine oxidase substrates and substrate affinity.

E F Domino

    Schizophrenia Bulletin
    |January 1, 1980
    PubMed
    Summary

    This review details evidence for two forms of monoamine oxidase (MAO) enzymes: type A and type B. These distinct MAO types are identified through substrate affinities, inhibitor responses, and heat stability, with telemethylhistamine as a type B substrate.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Neuroscience

    Background:

    • Monoamine oxidase (MAO) enzymes play a critical role in neurotransmitter metabolism.
    • Understanding MAO enzyme subtypes is crucial for neuropharmacology and the study of neurological disorders.
    • Previous research suggested heterogeneity in MAO enzymatic activity.

    Purpose of the Study:

    • To review the evidence supporting the existence of two distinct forms of monoamine oxidase (MAO) enzymes.
    • To differentiate between the proposed MAO type A and MAO type B.
    • To identify endogenous substrates specific to MAO subtypes.

    Main Methods:

    • Analysis of substrate affinities across different tissues.
    • Assessment of differential enzyme inhibition using specific agents like deprenyl and clorgyline.
    • Evaluation of enzyme activity through heat inactivation studies.

    Main Results:

    • Evidence supports the presence of two MAO forms, designated type A and type B, in various tissues.
    • Differential substrate affinities and inhibitor sensitivities distinguish MAO-A from MAO-B.
    • The enzymatic oxidation of telemethylhistamine (tMH) was identified as an example of an endogenous substrate processed by MAO-B.

    Conclusions:

    • The existence of two distinct MAO enzyme forms (A and B) is well-supported by biochemical and pharmacological data.
    • MAO-A and MAO-B exhibit unique properties allowing for their differentiation.
    • Telemethylhistamine serves as a specific endogenous substrate for MAO-B, aiding in subtype characterization.

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