The Forkhead Transcription Factor Hcm1 Promotes Mitochondrial Biogenesis and Stress Resistance in Yeast
Reverter Branchat, Gemma
MetadataShow full item record
In Saccharomyces cerevisiae, the forkhead transcription factor Hcm1 is involved in chromosome segregation, spindle pole dynamics, and budding. We found that Hcm1 interacts with the histone deacetylase Sir2 and shifts from cytoplasm to the nucleus in the G1/S phase or in response to oxidative stress
stimuli. The nuclear localization of Hcm1 depends on the activity of Sir2 as revealed by activators and inhibitors of the sirtuins and the sir2 mutant. Hcm1-overexpressing cells display more mitochondria that can be attributed to increased amounts of Abf2, a protein involved in mitochondrial biogenesis. These cells also show higher rates of oxygen consumption and improved resistance to oxidative stress that would be explained by increased catalase and Sod2 activities and molecular chaperones such as Hsp26, Hsp30, and members of Hsp70 family. Microarray analyses also reveal increased expression of genes involved in mitochondrial energy pathways and those allowing the transition from the exponential to the stationary phase. Taken together, these results describe a new and relevant role of Hcm1 for mitochondrial functions, suggesting that this transcription factor would participate in the adaptation of cells from fermentative to respiratory metabolism.
Is part ofJournal of Biological Chemistry, 2010, Vol. 285, núm. 47, p. 37092-37101
Showing items related by title, author, creator and subject.
Sir2 is induced by oxidative stress in a yeast model of Huntington disease and its activation reduces protein aggregation Sorolla Bardají, Maria Alba; Nierga, Clara; Rodríguez Colman, Maria José; Reverter Branchat, Gemma; Arenas, Alicia; Tamarit Sumalla, Jordi; Ros Salvador, Joaquim; Cabiscol Català, Elisa (Elsevier, 2011)Huntington disease (HD) is a neurodegenerative disorder caused by expansion of CAG trinucleotide repeats, leading to an elongated polyglutamine sequence (polyQ) in the huntingtin protein. Misfolding of mutant polyQ ...
The FOX transcription factor Hcm1 regulates oxidative metabolism in response to early nutrient limitation in yeast. Role of Snf1 and Tor1/Sch9 kinases Rodríguez Colman, Maria José; Sorolla Bardají, Maria Alba; Vall-llaura Espinosa, Núria; Tamarit Sumalla, Jordi; Ros Salvador, Joaquim; Cabiscol Català, Elisa (Elsevier, 2013)Within Saccharomyces cerevisiae, Hcm1is a member of the forkhead transcription factor family with a role in chromosome organization. Our group recently described its involvement in mitochondrial biogenesis and stress ...
Sorolla Bardají, Maria Alba; Reverter Branchat, Gemma; Tamarit Sumalla, Jordi; Ferrer, Isidre; Ros Salvador, Joaquim; Cabiscol Català, Elisa (Elsevier, 2008)Huntington disease (HD) is a neurodegenerative disorder caused by expansion of CAG repeats in exon 1 of the huntingtin gene, affecting initially the striatum and progressively the cortex. This work reports a proteomic analysis ...