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Soluble 5'-nucleotidase from thyroid gland partial purification and properties

J Niedźwiecka1, L Jaroszewicz

  • 1Department of Physical Chemistry, Medical Acedemy, Bialystok, Poland.

Biochemical and Biophysical Research Communications
|April 16, 1996
PubMed
Summary

Researchers purified a pig thyroid 5'-nucleotidase enzyme, finding it preferentially hydrolyzes IMP and GMP. This enzyme requires magnesium ions and shows optimal activity at pH 6.5.

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Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • 5'-nucleotidases are crucial enzymes in nucleotide metabolism.
  • Understanding their substrate specificity and kinetic properties is vital for biochemical research.

Purpose of the Study:

  • To purify and characterize a soluble 5'-nucleotidase from pig thyroid.
  • To determine the enzyme's substrate specificity, optimal conditions, and kinetic parameters.

Main Methods:

  • Purification using phosphocellulose chromatography, ammonium sulfate precipitation, and Sephadex G-150 gel filtration.
  • Enzyme activity assays to determine substrate preference, optimal pH, and Michaelis constants (Km).

Main Results:

  • A soluble 5'-nucleotidase was purified over 110-fold, free of non-specific phosphatases.

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  • The enzyme exhibited optimal activity at pH 6.5 and preferentially hydrolyzed inosine monophosphate (IMP) and guanosine monophosphate (GMP).
  • Michaelis constants (Km) were 0.66 mM for IMP and 1.0 mM for GMP, with relative Vmax values indicating a preference for IMP > CMP > AMP > UMP. Magnesium ions (Mg2+) were essential for activity.

    • Conclusions:

    • The purified pig thyroid 5'-nucleotidase is a distinct enzyme with specific substrate preferences.
    • Kinetic data and cofactor requirements provide insights into its role in nucleotide metabolism.