RESUMO
Pmt1p is an important member of the protein O-mannosyltransferase (PMT) family of enzymes, which participates in the endoplasmic reticulum (ER) unfolded protein response (UPR), an important pathway for alleviating ER stress. ER stress and the UPR have been implicated in aging and age-related diseases in several organisms; however, a possible role for PMT1 in determining lifespan has not been previously described. In this study, we report that deletion of PMT1 increases replicative lifespan (RLS) in the budding yeast Saccharomyces cerevisiae, while overexpression of PMT1 (PMT1-OX) reduces RLS. Relative to wild-type and PMT1-OX strains, the pmt1Δ strain had enhanced HAC1 mRNA splicing and elevated expression levels of UPR target genes. Furthermore, the increased RLS of the pmt1Δ strain could be completely abolished by deletion of either IRE1 or HAC1, two upstream modulators of the UPR. The double deletion strains pmt1Δhac1Δ and pmt1Δire1Δ also displayed generally reduced transcription of UPR target genes. Collectively, our results suggest that PMT1 deficiency enhances basal activity of the ER UPR and extends the RLS of yeast mother cells through a mechanism that requires both IRE1 and HAC1.
Assuntos
Envelhecimento/genética , Longevidade/genética , Manosiltransferases/genética , Saccharomyces cerevisiae/genética , Resposta a Proteínas não Dobradas , Envelhecimento/metabolismo , Fatores de Transcrição de Zíper de Leucina Básica/genética , Fatores de Transcrição de Zíper de Leucina Básica/metabolismo , Western Blotting , Estresse do Retículo Endoplasmático , Manosiltransferases/metabolismo , Glicoproteínas de Membrana/genética , Glicoproteínas de Membrana/metabolismo , Reação em Cadeia da Polimerase , Proteínas Serina-Treonina Quinases/genética , Proteínas Serina-Treonina Quinases/metabolismo , Proteínas Repressoras/genética , Proteínas Repressoras/metabolismo , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/metabolismoRESUMO
Yeast Cia2p is a component of the cytosolic Fe/S protein assembly (CIA) machinery. Initial studies of the CIA machinery were performed in yeast, but the precise role of Cia2p in this eukaryote is still unknown. We report that CIA2 deficiency results in impaired oxidative stress response, as evidenced by increased sensitivity to the oxidant cumene hydroperoxide (CHP), impaired activities of superoxide dismutases and aconitase and decreased replicative lifespan in the mutants. Moreover, intracellular reactive oxygen species levels were significantly increased in CIA2-deficient cells after treatment with CHP. We also show that CIA2-deficient cells display an increased resistance to tunicamycin-induced endoplasmic reticulum (ER) stress, as evidenced by the upregulated splicing of the mRNA of HAC1, which encodes a functional transcription factor that regulates the transcription of unfolded protein response (UPR) target genes, suggesting enhanced intracellular UPR activity. Furthermore, the transcription of several canonical UPR target genes is strongly induced in CIA2-deficient cells as compared with wild-type controls. Taken together, these results suggest the involvement of Cia2p in oxidative and ER stress responses in yeast.
Assuntos
Estresse do Retículo Endoplasmático , Estresse Oxidativo , Proteínas de Saccharomyces cerevisiae/fisiologia , Saccharomyces cerevisiae/metabolismo , Resposta a Proteínas não Dobradas , Fatores de Transcrição de Zíper de Leucina Básica/genética , Derivados de Benzeno/farmacologia , Citoplasma/genética , Citoplasma/fisiologia , Mutação , Espécies Reativas de Oxigênio/metabolismo , Reação em Cadeia da Polimerase em Tempo Real , Proteínas Repressoras/genética , Proteínas Repressoras/fisiologia , Saccharomyces cerevisiae/efeitos dos fármacos , Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/genética , Transdução de Sinais , Fatores de Transcrição , Tunicamicina/farmacologia , Resposta a Proteínas não Dobradas/genética , Regulação para CimaRESUMO
Saccharomyces cerevisiae Nar1p is an essential Fe/S protein that exhibits striking similarity to bacterial iron-only hydrogenases. Nar1p is required for the maturation of cytosolic and nuclear, but not of mitochondrial Fe/S proteins, and plays a role in modulating sensitivity to oxygen in both yeast and Caenorhabditis elegans through unknown mechanisms. Here we report that Nar1 deficiency results in shortened lifespan and sensitivity to paraquat that is rescued by increased expression of mitochondrial superoxide dismutase. These data suggest that Nar1p promotes protection against oxidative stress and define a new role for Nar1p in promoting replicative lifespan.
