Multiple elements and auto-repression regulate Rox1, a repressor of hypoxic genes in Saccharomyces cerevisiae.
The ROX1 gene encodes a heme-induced repressor of hypoxic genes in yeast. Using RNA blot analysis and a ROX1/lacZ fusion construct that included the ROX1 upstream region and only the first codon, we discovered that Rox1 represses its own expression. Gel-retardation experiments indicated that Rox1 was capable of binding to its own upstream region. Overexpression of Rox1 from the inducible GAL1 promoter was found to be inhibitory to cell growth. Also, we found that, as reported previously, Hap1 is partially responsible for heme-induction of ROX1, but, in addition, it also may play a role in ROX1 repression in the absence of heme. There is a second repressor of anaerobic ROX1 expression that requires the general repressor Tup1/Ssn6 for its function.
Deckert
J
J
Department of Biological Sciences, State University of New York at Albany 12222, USA.
Perini
R
R
Balasubramanian
B
B
Zitomer
R S
RS
D000332:Aerobiosis; D000693:Anaerobiosis; D001483:Base Sequence; D001665:Binding Sites; D019757:Carbon-Oxygen Lyases; D002455:Cell Division; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism*; D005656:Fungal Proteins / Q000235:genetics; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal / Q000235:genetics*; D005800:Genes, Fungal; D006418:Heme / Q000494:pharmacology; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics; D011485:Protein Binding; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins; D017422:Sequence Analysis, DNA
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D009687:Nuclear Proteins; C083348:ROX1 protein, S cerevisiae; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; C066502:TUP1 protein, S cerevisiae; D006418:Heme; D019757:Carbon-Oxygen Lyases; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase