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JBC, Vol. 254, Issue 2, 253-254, Jan, 1979

Effect of hydroxyurea on T4 ribonucleotide reductase

O. Berglund and B. M. Sjoberg

Phage T4-induced ribonucleotide reductase, purified to homogeneity, catalyzes the reduction of the four ribonucleotides CDP, UDP, ADP, and GDP to the corresponding deoxyribonucleotides. The enzyme is an order of magnitude more sensitive to hydroxyurea than the corresponding Escherichia coli enzyme. Fifty per cent inhibition occurs at 10 micrometer hydroxyurea. Inhibition is complete at a high concentration of the drug, and there is no differential effect on the four substrates. Treatment of T4 ribonucleotide reductase or its isolated subunits with hydroxyurea does not lead to their irreversible inactivation.
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