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Specific inhibitors of each of the three RNA polymerases of Blastocladiella emersonii have been found. Cycloheximide specifically inhibited the in vitro activity of the DEAE-fraction I enzyme, alpha-amanitin specifically inhibited the DEAE-fraction II enzyme, and rifampicin specifically inhibited the fraction III enzyme. DNA stimulation and dependency on the four riboside triphosphates were shown to be characteristic of each of the three fractions. Optimum concentrations of magnesium ions required were shown to differ among the three fractions and to be somewhat higher than optimum concentrations of manganese ions. The effect of pH on activity was essentially identical for each of the three fractions. Kinetic experiments and nuclease assays indicated the presence of some interfering substances in the partially purified RNA polymerase fractions.

Specific Inhibitors of the Three RNA Polymerases from the Aquatic Fungus Blastocladiella emersonii