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In order to analyze the structure–function of multi-subunit RNA polymerases (RNAPs), it is necessary to make site-directed mutations in key residues. Because Saccharomyces cerevisiae RNAP II is isolated as a 12 subunit enzyme that has not been amenable to in vitro reconstitution, making site-directed mutations in a particular subunit presents technical issues. In this work, we demonstrate a method...
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