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A series of 6-anilinouracils, dGTP analogues which selectively inhibit specific bacterial DNA polymerases, were examined for their capacity to inhibit purified DNA polymerases from HeLa cells. The p-n-butyl derivative (BuAU) was found to inhibit DNA polymerase alpha with a Ki of approximately 60 microM. The inhibitory effect of BuAU was reversed specifically by dGTP and was observed only for DNA polymerase alpha; polymerases beta and lambda were not inhibited by drug at concentrations as high as 1 mM. BuAU also was inhibitory in vivo in HeLa cell culture; at 100 microM it reversibly inhibited cell division and selectively depressed DNA synthesis. The results of these studies indicate that BuAU is an inhibitor with considerable potential as a specific probe with which to dissect the structure of mammalian polymerase alpha and its putative role in cellular DNA replication.

Butylanilinouracil: a selective inhibitor of HeLa cell DNA synthesis and HeLa cell DNA polymerase alpha