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. 1993 Oct;13(10):6071–6078. doi: 10.1128/mcb.13.10.6071

The Rox1 repressor of the Saccharomyces cerevisiae hypoxic genes is a specific DNA-binding protein with a high-mobility-group motif.

B Balasubramanian 1, C V Lowry 1, R S Zitomer 1
PMCID: PMC364667  PMID: 8413209

Abstract

The ROX1 gene encodes a repressor of the hypoxic functions of the yeast Saccharomyces cerevisiae. The DNA sequence of the gene was determined and found to encode a protein of 368 amino acids. The amino-terminal third of the protein contains a high-mobility-group motif characteristic of DNA-binding proteins. To determine whether the Rox1 repressor bound DNA, the gene was expressed in Escherichia coli cells as a fusion to the maltose-binding protein and this fusion was partially purified by amylose affinity chromatography. By using a gel retardation assay, both the fusion protein and Rox1 itself were found to bind specifically to a synthetic 32-bp DNA containing the hypoxic consensus sequence. We assessed the role of the general repressor Ssn6 in ANB1 repression. An ANB1-lacZ fusion was expressed constitutively in an ssn6 deletion strain, and deletion of the Rox1 binding sites in the ANB1 upstream region did not increase the level of derepression, suggesting that Ssn6 exerts its effect through Rox1. Finally, ROX1 was mapped to yeast chromosome XVI, near the ARO7-OSM2 locus.

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