Diethylmaleate activates the transcription factor Pap1 by covalent modification of critical cysteine residues.
Mol Microbiol
; 45(1): 243-54, 2002 Jul.
Article
em En
| MEDLINE
| ID: mdl-12100563
ABSTRACT
During the last decade, much has been learnt about the mechanisms by which oxidative stress is perceived by aerobic organisms. The Schizosaccharomyces 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 modification 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 formation of a thioether. Here we show that DEM triggers Pap1 nuclear accumulation by a novel molecular mechanism.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Schizosaccharomyces
/
Proteínas Fúngicas
/
Regulação Fúngica da Expressão Gênica
/
Proteínas de Ligação a DNA
/
Maleatos
Idioma:
En
Revista:
Mol Microbiol
Assunto da revista:
BIOLOGIA MOLECULAR
/
MICROBIOLOGIA
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Espanha