Inhibitors of Bacillus subtilis DNA polymerase III. 6-(arylalkylamino)uracils and 6-anilinouracils.

J Med Chem (1977), Volume 20, Page 1186

Abstract:

6-(Benzylamino)uracils and substituted 6-anilinouracils have been found to be potent inhibitors of Bacillus subtilis DNA polymerase III by a mechanism identical with that of 6-(phenylhydrazino)uracils. Higher phenylalkylamino homologues are progressively weaker inhibitors of the enzyme. Examination of the effects of substituents on the activity of 6-(benzylamino)uracils against wild-type and mutant enzymes and preliminary results for 6-anilinouracils have permitted further dissection of the mechanism of inhibition. The experimental results indicate that (1) the polymerase inhibitor binding site is compact, accommodating only small alterations in the distance between the uracil and phenyl rings, (2) the phenyl ring, which provides the major contribution to inhibitor-enzyme binding, adopts a specific active conformation, and (3) an enzyme site which interacts with substituents in the phenyl ring forms a part of the active site of DNA polymerase III.

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