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. 1986 Feb;5(2):343–354. doi: 10.1002/j.1460-2075.1986.tb04218.x

Adenovirus stimulation of transcription by RNA polymerase III: evidence for an E1A-dependent increase in transcription factor IIIC concentration.

S Yoshinaga, N Dean, M Han, A J Berk
PMCID: PMC1166738  PMID: 2940084

Abstract

Human cells expressing adenovirus E1A proteins transcribe transfected tRNA and adenovirus VAI genes at greater than 10-fold higher levels than uninfected HeLa cells. Here we show that the increased transcription observed in vivo is reflected in the in vitro transcriptional activity of cell extracts. Depletion of E1A protein from these extracts by immunoprecipitation with a monoclonal antibody did not diminish the activity, suggesting that E1A proteins do not stimulate transcription directly. Fractionation of the extracts by chromatography on phosphocellulose suggests that the higher activity of extracts of adenovirus-infected cells was due to increased activity of the transcription factor (TF) which is the limiting component required for specific initiation of tRNA and VAI transcription in extracts of uninfected HeLa cells, i.e. TFIIIC. Template commitment titrations further suggest that the increased TFIIIC activity was due to an increase in the concentration of active TFIIIC. On the basis of these results and recent genetic analyses of early adenovirus promoters, we suggest that E1A proteins stimulate transcription of adenovirus genes indirectly by increasing the effective in vivo concentration of the limiting cellular transcription factors required for their transcription.

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