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Polyamine biosynthesis and interconversion in rodent tissues

A E Pegg, J E Seely, H Pösö

    Federation Proceedings
    |December 1, 1982
    PubMed
    Summary

    This study details the purification and characterization of key enzymes regulating polyamine levels in rodents, including ornithine decarboxylase and spermidine/spermine N1-acetyltransferase, crucial for understanding polyamine metabolism.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Polyamine levels in rodent tissues are controlled by three key enzymes: ornithine decarboxylase (ODC), S-adenosylmethionine decarboxylase (SAMDC), and spermidine/spermine N1-acetyltransferase (SSAT).
    • These enzymes are characterized by low cellular abundance, short half-lives, and high inducibility, making their study challenging.

    Purpose of the Study:

    • To purify and characterize the key enzymes involved in polyamine metabolism.
    • To utilize specific inhibitors for enzyme quantification, localization, and degradation studies.
    • To investigate differences in enzyme forms across tissues.

    Main Methods:

    • Purification of ornithine decarboxylase from androgen-treated mouse kidneys.
    • Specific labeling of ODC using radioactive alpha-difluoromethylornithine (DFMO).
    • Purification of S-adenosylmethionine decarboxylase from rat liver and psoas muscle.
    • Purification of spermidine/spermine N1-acetyltransferase from carbon tetrachloride-induced rat liver.

    Main Results:

    • Ornithine decarboxylase was purified ~10,000-fold and specifically labeled with radioactive DFMO, allowing for molecular titration and autoradiographic localization.
    • Significant differences were observed in S-adenosylmethionine decarboxylase forms between rat liver and psoas muscle.
    • Spermidine/spermine N1-acetyltransferase was purified >100,000-fold and shown to acetylate both spermine and spermidine, with products subsequently oxidized by polyamine oxidase.

    Conclusions:

    • The study successfully purified and characterized key enzymes in polyamine metabolism, providing tools for further investigation.
    • Specific labeling with DFMO is effective for studying ornithine decarboxylase kinetics and localization.
    • The findings highlight tissue-specific variations in S-adenosylmethionine decarboxylase and the role of SSAT in polyamine catabolism.

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