Prolonged α-amanitin treatment of cells for studying mutated polymerases causes degradation of DSIF160 and other proteins.

Abstract excerpt

A useful method for studying the function of the mammalian RNA polymerase II takes advantage of the extreme sensitivity of its largest subunit, Rpb1, to α-amanitin. Mutations of interest are introduced into an α-amanitin-resistant version of Rpb1, which is then expressed ectopically in cells. The phenotypes of these cells are then examined after inhibiting the endogenous wild-type polymerase with α-amanitin....

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