Evidence for a heat shock transcription factor-independent mechanism for heat shock induction of transcription in Saccharomyces cerevisiae.
Transcription of the DNA damage-responsive gene, DDRA2, of Saccharomyces cerevisiae is activated by heat shock treatment as well as by mutagen/carcinogen exposure. Deletion analysis of upstream noncoding sequence indicated that sequences between approximately -190 and -140 base pairs were necessary for heat shock and DNA damage regulation of transcription. Fusion of this region to a CYC1-lacZ reporter gene demonstrated that the sequence between -202 and -165 base pairs was sufficient for basal level and heat shock-induced expression. This DNA sequence was unable to bind heat shock transcription factor as judged by binding competition experiments in vitro. These results indicate that yeast possesses a second, heat shock transcription factor-independent mechanism for activating transcription in response to thermal stress.
Kobayashi
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Laboratory of Biomedical and Environmental Sciences, University of California, Los Angeles 90024.
McEntee
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K
D000595:Amino Acid Sequence; D001483:Base Sequence; D002872:Chromosome Deletion; D004249:DNA Damage; D004271:DNA, Fungal / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D006358:Hot Temperature; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
D004271:DNA, Fungal; D015345:Oligonucleotide Probes; D014157:Transcription Factors; D001616:beta-Galactosidase