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. 1991 Oct;11(10):5285–5290. doi: 10.1128/mcb.11.10.5285

RNA polymerase II pauses at the 5' end of the transcriptionally induced Drosophila hsp70 gene.

T O'Brien 1, J T Lis 1
PMCID: PMC361584  PMID: 1922045

Abstract

An RNA polymerase II molecule is associated with the 5' end of the Drosophila melanogaster hsp70 gene under non-heat shock conditions. This polymerase is engaged in transcription but has paused, or arrested, after synthesizing about 25 nucleotides (A. E. Rougvie and J. T. Lis, Cell 54:795-804, 1988). Resumption of elongation by this paused polymerase appears to be the rate-limiting step in hsp70 transcription in uninduced cells. Here we report results of nuclear run-on assays that measure the distribution of elongating and paused RNA polymerase molecules on the hsp70 gene in induced cells. Pausing of polymerase was detected at the 5' end of hsp70 in cells exposed to the intermediate heat shock temperatures of 27 and 30 degrees C. At 30 degrees C, each copy of hsp70 was transcribed approximately five times during the 25-min heat shock that we used. Therefore, once the hsp70 gene is induced to an intermediate level, initiation of transcription by RNA polymerase II remains more rapid than the resumption of elongation by a paused polymerase molecule.

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Selected References

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