Control of 26S proteasome expression by transcription factors regulating multidrug resistance in Saccharomyces cerevisiae

Molecular Microbiology
Grzegorz OwsianikMichel Ghislain

Abstract

In eukaryotic cells, intracellular proteolysis occurs mainly via the ubiquitin-proteasome system. Expression of the yeast proteasome is under the control of the transcription factor, Rpn4p (also known as Son1p/Ufd5p). We show here that the RPN4 gene promoter contains regulatory sequences that bind Pdr1p and Pdr3p, two homologous zinc finger-containing transcription factors, which mediate multiple drug resistance through the expression of membrane transporter proteins. Mutations in the RPN4 Pdr1p/Pdr3p binding sites lead to decreased expression of the proteasome RPT6 gene and to defective ubiquitin-mediated proteolysis. Pdr3p, but not Pdr1p, is required for normal levels of intracellular proteolysis, indicating that the two transcription factors have distinct functions in the control of RPN4 expression. The RPN4 promoter contains an additional sequence that binds Yap1p, a bZIP-type transcription factor that plays an important role in the oxidative stress response and multidrug resistance. We also show that the Yap1p response element is important in the transactivation of RPN4 by Yap1p. In yeast cells lacking Pdr1p, ubiquitin-Pro-beta-galactosidase, a short-lived protein used to assay proteasome activity, is stabilized by the los...Continue Reading

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