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Differential effect of hydroxyurea on a ribonucleotide reductase system
The Journal of Biological Chemistry
|March 10, 1978
Summary
Hydroxyurea inhibits phage T4-induced ribonucleotide reductase activity in Escherichia coli. CDP and ADP reductase activities are more sensitive to hydroxyurea than UDP and GDP reductase activities.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Bacteriophage T4 infection of Escherichia coli significantly elevates ribonucleotide reductase activity.
- Ribonucleotide reductases are crucial enzymes for DNA synthesis and repair.
Purpose of the Study:
- To investigate the in vitro inhibitory effects of hydroxyurea on T4-induced ribonucleotide reductase activities.
- To determine the differential sensitivity of CDP, ADP, UDP, and GDP reductase activities to hydroxyurea.
Main Methods:
- Enzyme assays were performed to measure ribonucleotide reductase activities.
- Hydroxyurea was used as an inhibitor at various concentrations.
Main Results:
- Hydroxyurea effectively inhibited T4-induced CDP, ADP, UDP, and GDP reductase activities in vitro.
- CDP and ADP reductase activities exhibited greater sensitivity to hydroxyurea inhibition compared to UDP and GDP reductase activities.
- Significant differences in inhibition were observed, with lower hydroxyurea concentrations impacting CDP and ADP reductases more severely.
Conclusions:
- Hydroxyurea demonstrates differential inhibitory effects on various ribonucleotide reductase activities induced by phage T4.
- These findings highlight the distinct biochemical properties of different ribonucleotide reductase forms and their susceptibility to specific inhibitors.