Inhibition of a DNA Polymerase from Bacillus subtilis by Hydroxyphenylazopyrimidines
- 1 January 1973
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 70 (1) , 103-107
- https://doi.org/10.1073/pnas.70.1.103
Abstract
The antimicrobial agent, 6-(p-hydroxyphenylazo)-uracil, specifically inhibits DNA polymerase III of Bacillus subtilis with a K(i) of less than 1 muM. The inhibition requires prior reduction of the drug, is reversible, and is competitive with dGTP. High amounts of dATP prevent inhibition by the closely related drug, 6-(p-hydroxyphenylazo)-isocytosine. A model is presented in which the inhibitors base-pair with the template while part of a ternary complex with the enzyme. These results imply that DNA polymerase III of B. subtilis is necessary for chromosomal replication.Keywords
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