it stimulates transcription by each of the four yeast-nuclear rna polymerases , by rat-liver rna polymerases i and ii , and by escherichia coli rna polymerase . pi-factor can cause each of the eukaryotic rna polymerases to become insensitive to rifamycin af-013 , but does not stop inhibition of e. coli rna polymerase by rifamycin af-013 .
C0035678
rna polymerases i
C0035681
rna polymerase