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. 1991 May 15;88(10):4109–4113. doi: 10.1073/pnas.88.10.4109

Heat shock-regulated transcription in vitro from a reconstituted chromatin template.

P B Becker 1, S K Rabindran 1, C Wu 1
PMCID: PMC51607  PMID: 2034656

Abstract

To investigate the mechanisms of transcriptional regulation of Drosophila heat shock genes we studied the activity of a heat shock promoter in vitro after reconstitution into chromatin. Increasing the duration of nucleosome assembly progressively inactivated a plasmid template when it was transcribed with extracts of either unshocked or heat-shocked Drosophila embryos, despite induction of the transcriptional activator heat shock factor. Addition of the general transcription factor IID (TFIID) before nucleosome assembly did not significantly relieve nucleosomal inhibition, but TFIID potentiated the promoter to be responsive to activation by heat shock factor in the heat shock transcription extract. The potentiation by TFIID could be related to the nucleosome-free, hypersensitive state of heat shock promoters previously observed in vivo before heat shock induction and may be necessitated by the need to expedite activation of heat shock genes in response to environmental stress.

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