Diethylmaleate activates the transcription factor Pap1 by covalent modification of critical cysteine residues
| Autor: | Cristina Chiva, Esther A. Castillo, Nic Jones, Joaquín Abián, Alberto Moldón, Elena Hidalgo, José Ayté, Montse Carrascal |
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| Rok vydání: | 2002 |
| Předmět: |
Pancreatitis-Associated Proteins
Biology Microbiology Fungal Proteins chemistry.chemical_compound Thioether Gene Expression Regulation Fungal Schizosaccharomyces medicine Cysteine Hydrogen peroxide Nuclear export signal Molecular Biology Transcription factor Cell Nucleus chemistry.chemical_classification Maleates Hydrogen Peroxide DNA-Binding Proteins Oxidative Stress Basic-Leucine Zipper Transcription Factors medicine.anatomical_structure chemistry Biochemistry Cytoplasm Spectrometry Mass Matrix-Assisted Laser Desorption-Ionization Thiol Schizosaccharomyces pombe Proteins Nucleus Signal Transduction |
| Zdroj: | Molecular Microbiology. 45:243-254 |
| ISSN: | 1365-2958 0950-382X |
| DOI: | 10.1046/j.1365-2958.2002.03020.x |
| Popis: | Summary During the last decade, much has been learnt about the mechanisms by which oxidative stress is per- ceived by aerobic organisms. The Schizosaccha- romyces pombe Pap1 protein is a transcription factor localized at the cytoplasm, which accumulates in the nucleus in response to different inducers, such as the pro-oxidant hydrogen peroxide (H2O2) or the glutathione-depleting agent diethylmaleate (DEM). As described for other H2O2 sensors, our genetic data indicates that H2O2 reversibly oxidizes two cysteine residues in Pap1 (Cys278 and Cys501). Surprisingly, our studies demonstrate that DEM generates a non-reversible modification of at least two cysteine residues located in or close to the nuclear export signal of Pap1 (Cys523 and Cys532). This modifica- tion impedes the interaction of the nuclear exporter Crm1 with the nuclear export signal located at the carboxy-terminal domain of Pap1. Mass spectrometry data suggest that DEM binds to the thiol groups of the target cysteine residues through the forma- tion of a thioether. Here we show that DEM triggers Pap1 nuclear accumulation by a novel molecular mechanism. |
| Databáze: | OpenAIRE |
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