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Nucleic Acids Research, Vol 26, Issue 18 4186-4195, Copyright © 1998 by Oxford University Press

ARTICLES

Biochemical and genetic characterization of the dominant positive element driving transcription ofthe yeast TBP-encoding gene, SPT15

SC Schroeder and PA Weil
Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville,TN 37232-0615, USA.

We previously demonstrated that a combination of both positive and negative cis -acting upstream elements control the transcription of the gene encoding TBP ( SPT15 ) in Saccharomyces cerevisiae . One of these elements found in that study, resident between 5' flanking sequences - 147 and -128 , and termed PED (for positive element distal), was found to play an essential positive role in driving transcription of the gene encoding TBP. In this report, we map at nucleotide-level resolution, the critical residues which comprise PED, purify and sequence the protein that binds to it and determine that this PED binding factor is Abf1p, an abundant yeast protein previously broadly implicated in both gene regulation and DNA replication. In the case of the TBP-encoding gene, however, Abf1p works through the PED element which is a non- consensus binding site. Based upon the work of others, the PED-variant ABF1 site would be predicted to be a very poor binding site for this factor yet Abf1p binds PED and a consensus ABF1 site with comparable affinity. These results are discussed in light of the broader context of Abf1p-mediated gene regulation.
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