Abstract
Transfer RNA nucleotidyl transferase from Ehrlich tumor cells was inhibited by proflavine sulfate and ethidium bromide but not by actinomycin D, chromomycin, rifamycin SV, rifampin, daunomycin, or alpha-amanitin. Complete inhibition of nucleotidyl transferase activity was attained at a final concentration of 1 mmol/1 proflavine sulfate, while 2 mmol/1 ethidium bromide was required to completely inhibit the enzyme. CMP incorporation into tRNA was more sensitive to both proflavine sulfate and ethidium bromide than was AMP incorporation.
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