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. 1990 Aug;10(8):3926–3933. doi: 10.1128/mcb.10.8.3926

Transcriptional potentiation of the vitellogenin B1 promoter by a combination of both nucleosome assembly and transcription factors: an in vitro dissection.

B Corthésy 1, P Léonnard 1, W Wahli 1
PMCID: PMC360903  PMID: 2370858

Abstract

The Xenopus laevis vitellogenin B1 promoter was assembled into nucleosomes in an oocyte extract. Subsequent RNA polymerase II-dependent transcription from these DNA templates fully reconstituted in chromatin in a HeLa nuclear extract was increased 50-fold compared with naked DNA. Remarkably, under specific conditions, production of a high level of transcripts occurred at very low DNA (1 ng/microliter) and HeLa nuclear protein (1.6 micrograms/microliters) concentrations. When partially reconstituted templates were used, transcription efficiency was intermediate between that of fully reconstituted and naked DNA. These results implicate chromatin in the process of the transcriptional activation observed. Depletion from the oocyte assembly extract of an NF-I-like factor which binds in the promoter region upstream of the TATA box (-114 to -101) or deletion from the promoter of the region interacting with this factor reduced the transcriptional efficiency of the assembled templates by a factor of 5, but transcription of these templates was still 10 times higher than that of naked DNA. Together, these results indicate that the NF-I-like factor participates in the very efficient transcriptional potentiation of the vitellogenin B1 promoter which occurs during nucleosome assembly.

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