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The in vitro transcription properties of purified yeast RNA polymerase II have been analyzed on prokaryotic plasmids (pBR322 and pBR313) and chimaeric plasmids bearing yeast 2 micron sequences (BTYP 1, BTYH 2 and BTYH 3). Conditions for selective transcription of the 2 micron DNA sequences in chimaeric plasmids have been determined. pBR322 and pBR313 are not transcribed by the purified RNA polymerase II when not bearing eukaryotic inserts. We show that the agarose gel electrophoretic analysis of ternary transcription complexes allows the localization of nascent RNA chains. The RNA produced has been visualized by electron microscopy (nascent RNA hybridization loops) and by gel electrophoretic analysis. All the observed properties are shared by RNA polymerase II purified by a conventional method (1) and by a rapid alternative procedure described herein. The peculiar properties of a partially purified form of RNA polymerase II are reported.
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