Comprehensive transcriptional analysis of the oxidative response in yeast
Molina Navarro, Maria Micaela
Pérez-Ortín, José E.
MetadataShow full item record
The oxidative stress response in Saccharomyces cerevisiae has been analyzed by parallel determination of mRNA levels and transcription rates for the entire genome. A mathematical algorithm has been adapted for a dynamic situation such as the response to stress, to calculate theoretical mRNA decay
rates from the experimental data. Yeast genes have been grouped into 25 clusters according to mRNA level and transcription rate kinetics, and average mRNA decay rates have been calculated for each cluster. In most of the genes, changes in one or both experimentally determined parameters occur during the stress response. 24% of the genes are transcriptionally induced without an increase inmRNAlevels. The lack of parallelism between the evolution of the mRNA amount and transcription rate predicts changes inmRNAstability during stress. Genes for ribosomal proteins and rRNA processing enzymes are abundant among those whose mRNAs are predicted to destabilize. The number of genes whose mRNAs are predicted to stabilize is lower, although some protein folding or proteasomal genes are among the latter. We have confirmed the mathematical predictions for several genes pertaining to different clusters by experimentally determining mRNA decay rates using the regulatable tetO promoter in transcriptional expression conditions not affected by the oxidative stress. This study indicates that the oxidative stress response in yeast cells is not only conditioned by gene transcription but also by the mRNA decay dynamics and that this complex response may be particularly relevant to explain the temporary down-regulation of protein synthesis occurring during stress.
Is part ofThe Journal of Biological Chemistry, 2008, vol. 283, núm. 26, p. 17908-17918
European research projects
Showing items related by title, author, creator and subject.
Castells i Roca, Laia; García-Martínez, José; Moreno, Joaquín; Herrero Perpiñán, Enrique; Bellí i Martínez, Gemma; Pérez-Ortín, José E. (Public Library of Science (PLoS), 2011)We have analyzed the heat stress response in the yeast Saccharomyces cerevisiae by determining mRNA levels and transcription rates for the whole transcriptome after a shift from 25uC to 37uC. Using an established mathematical ...
Saccharomyces cerevisiae glutaredoxin 5-deficient cells subjected to continuous oxidizing conditions are affected in the expression of specific sets of genes Bellí i Martínez, Gemma; Molina Navarro, Maria Micaela; García-Martínez, José; Pérez-Ortín, José E.; Herrero Perpiñán, Enrique (The American Society for Biochemistry and Molecular Biology, 2004)The Saccharomyces cerevisiae GRX5 gene codes for a mitochondrial glutaredoxin involved in the synthesis of iron/sulfur clusters. Its absence prevents respiratory growth and causes the accumulation of iron inside cells and ...
Prokaryotic and eukaryotic monothiol glutaredoxins are able to perform the functions of Grx5 in the biogenesis of Fe/S clusters in yeast mitochondria Molina Navarro, Maria Micaela; Casas Herranz, Celia; Piedrafita Llorens, Lídia; Bellí i Martínez, Gemma; Herrero Perpiñán, Enrique (Elsevier, 2003)The Saccharomyces cerevisiae monothiol glutare- doxin Grx5 participates in the mitochondrial biogenesis of iron–sulfur clusters. Grx5 homologues exist in organisms from bacteria to humans. Chicken (cGRX5) and human ...