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Dinucleosidetetraphosphatase inhibition by Zn(II)
Biochemical and Biophysical Research Communications
|June 15, 1983
Summary
Zinc (II) significantly inhibits dinucleoside-tetraphosphatase, an enzyme crucial for cellular processes. This inhibition is reversible and suggests a link between cellular zinc levels and dinucleoside tetraphosphate metabolism.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Dinucleoside-tetraphosphatase (EC 3.6.1.17) plays a role in cellular metabolism.
- The regulation of dinucleoside tetraphosphate levels is not fully understood.
- Zinc (II) is a common cofactor in biological systems.
Purpose of the Study:
- To investigate the effect of Zinc (II) on the activity of partially purified dinucleoside-tetraphosphatase.
- To characterize the nature of Zinc (II) inhibition.
- To explore the potential relationship between cellular Zinc (II) levels and dinucleoside tetraphosphate metabolism.
Main Methods:
- Enzyme inhibition assays using partially purified dinucleoside-tetraphosphatase.
- Time-dependent inhibition studies at 37 degrees C.
- Determination of kinetic parameters (Km) and effect of chelating agents (EDTA).
Main Results:
- 5 microM Zinc (II) caused almost complete inhibition of dinucleoside-tetraphosphatase activity.
- Inhibition was reversible by EDTA and time-dependent, reaching maximum inhibition within 5 minutes.
- Zinc (II) acted as a non-competitive inhibitor, not altering the Km for diadenosine tetraphosphate.
Conclusions:
- Zinc (II) is a potent inhibitor of dinucleoside-tetraphosphatase.
- The findings suggest that cellular Zinc (II) levels may directly influence dinucleoside tetraphosphate levels.
- This study highlights a potential dual role of Zinc (II) in regulating dinucleoside tetraphosphate metabolism (inhibition of degradation and activation of synthesis).