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Fusion proteins known to activate transcription in vivo were tested for the ability to stimulate transcription in vitro in a recently developed Saccharomyces cerevisiae RNA polymerase II transcription system. One fusion protein, whose activation domain was derived from the herpesvirus transcriptional activator VP16, gave more than 100-fold stimulation in the in vitro system. The order of effects of the various proteins was the same for transcription in vitro and in vivo, suggesting that the natural mechanism of activation is preserved in vitro.

Activation of yeast polymerase II transcription by herpesvirus VP16 and GAL4 derivatives in vitro.