Specific Inhibition of Nuclear RNA Polymerase II by α-Amanitin

Science  23 Oct 1970:
Vol. 170, Issue 3956, pp. 447-449
DOI: 10.1126/science.170.3956.447


α-Amanitin, a toxic substance from the mushroom Amanita phalloides, is a potent inhibitor of DNA-dependent RNA polymerase II (the nucleoplasmic form) from sea urchin, rat liver, and calf thymus. This compound exerts no effect on the activity of polymerase I (nucleolar form) or polymerase III (also nucleoplasmic). The inhibition is due to a specific interaction with polymerase II or with a complex of DNA and polymerase II.

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