Abstract
Plasmid DNA containing the adenovirus type 2 genes for VA RNA was linearized at a site distal to the gene, end labeled with a biotin-nucleotide analog of TTP, and incubated with avidin to form an avidin-biotinylated DNA complex. HeLa cell S100 extracts containing crude RNA polymerase III and transcription factors (TFs) IIIB and IIIC were programmed with the avidin-biotin-VA DNA to allow stable complex formation (A.B. Lassar, P.L. Martin, and R.G. Roeder, Science 222:740-748, 1983). Chromatography of the programmed extract over a biotin-cellulose affinity resin resulted in the selective, and virtually quantitative, retention of one of two stable preinitiation complexes, either VA-IIIC or VA-IIIC-IIIB, depending on the length of template incubation in the S100 extract. After washing the resin with 0.10 M and 0.25 M KCl to remove RNA polymerase III and nonspecifically bound proteins, respectively, TFIIIC was eluted from the VA-IIIC complex by the addition of 1.5 M KCl. The VA-IIIC-IIIB complex exhibited a higher salt stability. Most of TFIIIB and some TFIIIC were released by the addition of 1.5 M KCl; however, the majority of TFIIIC activity was recovered only after a subsequent 3.0 M KCl elution. The specific activity of the TFIIIC in the 3.0 M KCl fraction was 770-fold higher than that in the S100 extract, while the protein content of the 1.5 and 3.0 M KCl fractions was reduced 7,500- and 100,000-fold, respectively.
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Selected References
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