Abstract
Three nuclear RNA polymerases and one poly(A) polymerase were isolated from the yeast, Saccharomyces cerevisiae. The ability of cordycepin triphosphate to inhibit each was determined. RNA polymerase II was significantly more sensitive to this compound than the other polymerases. RNA polymerase I was relatively insensitive, being inhibited less than 20% by 40 μ m cordycepin triphosphate. The calculated apparent K i values of RNA polymerases II and III and poly(A) polymerase were, respectively, 0.3, 3.0, and 4.6 μ m. Inhibition was competitive with regard to ATP. These data do not support the idea that, in yeast, poly(A) addition to preformed RNA in vivo is the primary site of cordycepin action.
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