title: Autophagy-dependent regulation of the DNA damage response protein ribonucleotide reductase 1.
abstract: Protein synthesis and degradation are posttranscriptional pathways used by cells to regulate protein levels. We have developed a systems biology approach to identify targets of posttranscriptional regulation and we have employed this system in Saccharomyces cerevisiae to study the DNA damage response. We present evidence that 50% to 75% of the transcripts induced by alkylation damage are regulated posttranscriptionally. Significantly, we demonstrate that two transcriptionally-induced DNA damage response genes, RNR1 and RNR4, fail to show soluble protein level increases after DNA damage. To determine one of the associated mechanisms of posttranscriptional regulation, we tracked ribonucleotide reductase 1 (Rnr1) protein levels during the DNA damage response. We show that RNR1 is actively translated after damage and that a large fraction of the corresponding Rnr1 protein is packaged into a membrane-bound structure and transported to the vacuole for degradation, with these last two steps dependent on autophagy proteins. We found that inhibition of target of rapamycin (TOR) signaling and subsequent induction of autophagy promoted an increase in targeting of Rnr1 to the vacuole and a decrease in soluble Rnr1 protein levels. In addition, we demonstrate that defects in autophagy result in an increase in soluble Rnr1 protein levels and a DNA damage phenotype. Our results highlight roles for autophagy and TOR signaling in regulating a specific protein and demonstrate the importance of these pathways in optimizing the DNA damage response.
authors.affiliation: Department of Biomedical Sciences, University at Albany, State University of New York, Rensselaer, New York 12144, USA.
authors.forename: Madhu
authors.initials: M
authors.lastname: Dyavaiah
authors.forename: John P
authors.initials: JP
authors.lastname: Rooney
authors.forename: Sridar V
authors.initials: SV
authors.lastname: Chittur
authors.forename: Qishan
authors.initials: Q
authors.lastname: Lin
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Begley
mesh_terms: D000478:Alkylation / Q000235:genetics; D001343:Autophagy / Q000235:genetics / Q000502:physiology*; D004249:DNA Damage / Q000235:genetics*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D012323:RNA Processing, Post-Transcriptional; D012264:Ribonucleotide Reductases / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000166:cytology* / Q000201:enzymology / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000235:genetics; D014617:Vacuoles / Q000235:genetics / Q000378:metabolism
chemical_list: D029701:Saccharomyces cerevisiae Proteins; D012264:Ribonucleotide Reductases; C551024:Rnr1 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases; C500749:target of rapamycin protein, S cerevisiae