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Pyrimidine nucleotidases/phosphotransferases from human erythrocyte
A Amici1, M Emanuelli, N Raffaelli
1Istituto di Biochimica, Facoltà di Medicina e Chirurgia, Università di Ancona, Italy.
Nucleosides & Nucleotides
|August 5, 1999
Summary
Human erythrocyte pyrimidine nucleotidases (PN-I and PN-II) were purified and characterized. These enzymes can act as phosphotransferases, potentially aiding in the activation of chemotherapy nucleoside analogue drugs.
Area of Science:
- Biochemistry
- Enzymology
- Human Physiology
Background:
- Pyrimidine 5'-nucleotidases are enzymes involved in nucleotide metabolism.
- Understanding their function is crucial for drug development, particularly in chemotherapy.
Purpose of the Study:
- To purify and characterize two distinct cytoplasmic pyrimidine 5'-nucleotidases from human erythrocytes.
- To investigate the enzymatic activity and potential phosphotransferase function of these purified enzymes.
Main Methods:
- Purification of pyrimidine 5'-nucleotidases (PN-I and PN-II) from human erythrocytes to homogeneity.
- Characterization of enzyme properties, including substrate specificity and kinetic analysis.
- Assay of phosphotransferase activity using various nucleoside acceptors.
Main Results:
- Two homogeneous pyrimidine 5'-nucleotidases, PN-I and PN-II, were isolated.
- PN-I preferentially hydrolyzes pyrimidine 5'-monophosphates, while PN-II hydrolyzes 3'-monophosphates.
- Both enzymes demonstrated phosphotransferase activity, transferring phosphate to nucleoside acceptors.
Conclusions:
- Human erythrocytes contain at least two distinct pyrimidine 5'-nucleotidases with different substrate specificities.
- These enzymes possess phosphotransferase capabilities, suggesting a role in the activation of therapeutic nucleoside analogues.
- The findings have implications for understanding drug metabolism and developing novel chemotherapy strategies.