Abstract
In Candida albicans, ergosterol biosynthetic genes, including ERG11, which encodes the target of azole antifungal drugs, are regulated by the transcriptional regulator Upc2p. To initially characterize the promoter of the UPC2 gene, 5' rapid amplification of cDNA ends was used to identify two transcriptional initiation sites upstream of the ATG codon. The regions within the UPC2 promoter required for azole regulation of the UPC2 promoter were then identified using nested deletions fused to a luciferase reporter which were tested for azole inducibility in wild-type (WT) and upc2Delta/upc2Delta strains. Two distinct regions important for azole induction were identified: a Upc2p-dependent region (UDR) between bp -450 and -350 upstream of the ATG codon and a Upc2p-independent region (UIR) between bp -350 and -250 upstream of the ATG codon. Within the UDR, loss or mutation of the sterol response element (SRE), so named because of homology to the Saccharomyces cerevisiae Upc2p binding site, resulted in a decrease in both basal and induced expression in the WT strain but did not affect azole inducibility in the upc2Delta/upc2Delta deletion strain. Gel shift analyses using the DNA binding domain of Upc2p confirmed binding of the protein...Continue Reading
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