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. 1990 Jul;10(7):3635–3645. doi: 10.1128/mcb.10.7.3635

A downstream-element-binding factor facilitates assembly of a functional preinitiation complex at the simian virus 40 major late promoter.

D E Ayer 1, W S Dynan 1
PMCID: PMC360800  PMID: 2162478

Abstract

Recent work has shown that many promoters recognized by eucaryotic RNA polymerase II contain essential sequences located downstream of the transcriptional initiation site. We show here that the activity of a promoter element centered 28 base pairs downstream of the simian virus 40 major late initiation site appears to be mediated by a DNA-binding protein, which was isolated by affinity chromatography from HeLa cell nuclear extracts. In the absence of the other components of the transcriptional machinery, the protein bound specifically but weakly to its recognition sequence, with a Kd of approximately 10(-8) M. Analysis of kinetic data showed that mutation of the downstream element decreased the number of functional preinitiation complexes assembled at the promoter without significantly altering the time required for half the complexes to assemble. This suggests that in the absence of the downstream activating protein, preinitiation complexes are at least partially assembled but are not transcriptionally competent.

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