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Human liver prenyltransferase and its characterization

G F Barnard, G Popják

    Biochimica Et Biophysica Acta
    |September 15, 1981
    PubMed
    Summary

    Human liver prenyltransferase, crucial for farnesyl pyrophosphate synthesis, was purified and characterized. This enzyme requires specific divalent cations and is sensitive to substrate concentrations and chemical modification.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Human Physiology

    Background:

    • Prenyltransferase (EC 2.5.1.1) catalyzes a key step in isoprenoid biosynthesis.
    • Understanding human prenyltransferase is vital for metabolic pathway research.

    Purpose of the Study:

    • To purify and characterize prenyltransferase from human liver.
    • To investigate its kinetic properties, cofactor requirements, and structural similarities to porcine prenyltransferase.

    Main Methods:

    • Enzyme purification to homogeneity from human liver autopsy samples.
    • Enzyme activity assays with varying substrate and cofactor concentrations.
    • Characterization of kinetic parameters (Km, Vmax) and pH optimum.
    • Investigation of enzyme inhibition and activation mechanisms.
    • Immunological comparison with porcine prenyltransferase.

    Main Results:

    • Purified human liver prenyltransferase is a dimer (74 kDa) with a broad pH optimum (7.3-8.8).
    • The enzyme requires Mn2+ or Mg2+ and exhibits Michaelis constants of 0.44 µM for geranyl pyrophosphate and 0.94 µM for isopentenyl pyrophosphate.
    • Human prenyltransferase is similar to the B-form of porcine prenyltransferase and shows cross-reactivity with antibodies against it.
    • Enzyme activity is modulated by dithiols, phenylglyoxal, and iodoacetic acid, indicating specific functional residues.

    Conclusions:

    • The study provides a comprehensive biochemical characterization of human liver prenyltransferase.
    • The findings highlight the enzyme's structural and functional relationship with its porcine counterpart.
    • This research contributes to the understanding of isoprenoid biosynthesis in humans.

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