Abstract
The cationic triphenylmethane dyes crystal violet, methyl green, and malachite green inhibited DNA synthesis catalyzed by Escherichia coli B polymerase I (polymerase I). Lower concentrations of the dyes inhibited DNA replication as a direct function of the proportion of AT to GC in the DNA of Clostridium perfringens, Escherichia coli, and Micrococcus lysodeikticus. When the intercalant proflavin was employed, the GC-rich micrococcal DNA was most severely inhibited. In addition, both the triphenylmethanes and proflavin inhibited product hydrolysis catalyzed by polymerase I.
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