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. 1993 Dec;12(12):4677–4684. doi: 10.1002/j.1460-2075.1993.tb06156.x

Synthesis of reinitiated transcripts by mammalian RNA polymerase II is controlled by elongation factor SII.

M N Szentirmay 1, M Sawadogo 1
PMCID: PMC413907  PMID: 8223477

Abstract

Previous studies have revealed that the in vitro synthesis of reinitiated transcripts by RNA polymerase II requires an additional activity, designated reinitiation transcription factor (RTF), which is distinct from all of the general class II initiation factors. While further characterizing this activity, it was found that RTF displays properties indistinguishable from those of the RNA polymerase II elongation factor SII. In addition, Western blot analysis using SII-specific antibodies revealed that human SII is a major component in purified RTF preparations. The functional equivalence of the two proteins was established using recombinant SII, which proved fully capable of substituting for RTF in the reinitiation assay. In these reconstituted reactions, transcription complexes resulting from reinitiation events required SII to proceed through a 400 bp G-free cassette, while complexes resulting from the first round of initiations were SII-independent. Reinitiations can take place in the absence of SII; however, addition of the elongation factor is essential for full extension of the reinitiated transcripts. These results suggest that events taking place at the promoter (e.g. first-round initiations versus reinitiations) can create marked differences in the properties of RNA polymerase II elongation complexes.

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