Chronological and replicative life-span extension in Saccharomyces cerevisiae by increased dosage of alcohol dehydrogenase 1

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2007
Author
Reverter Branchat, Gemma
Cabiscol Català, Elisa
Tamarit Sumalla, Jordi
Sorolla Bardají, Maria Alba
Torre Ruiz, M. A. de la
Ros Salvador, Joaquim
Suggested citation
Reverter Branchat, Gemma; Cabiscol Català, Elisa; Tamarit Sumalla, Jordi; Sorolla Bardají, Maria Alba; Torre Ruiz, M. A. de la; Ros Salvador, Joaquim; . (2007) . Chronological and replicative life-span extension in Saccharomyces cerevisiae by increased dosage of alcohol dehydrogenase 1. Microbiology, 2007, vol. 153, núm. 11, p. 3667-3676. https://doi.org/10.1099/mic.0.2007/009340-0.
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Abstract
Alcohol dehydrogenase 1 (Adh1)p catalyses the conversion of acetaldehyde to ethanol, regenerating NAD+. In Saccharomyces cerevisiae, Adh1p is oxidatively modified during ageing and, consequently, its activity becomes reduced. To analyse whether maintaining this activity is advantageous for the cell, a yeast strain with an extra copy of the ADH1 gene (2 ADH1) was constructed, and the effects on chronological and replicative ageing were analysed. The strain showed increased survival in stationary phase (chronological ageing) due to induction of antioxidant enzymes such as catalase and superoxide dismutases. In addition, 2 ADH1 cells displayed an increased activity of silent information regulator 2 (Sir2)p, an NAD+-dependent histone deacetylase, due to a higher NAD+/NADH ratio. As a consequence, a 30 % extension in replicative life span was observed. Taken together, these results suggest that the maintenance of enzymes that participate in NAD+/NADH balancing is important to chronological and replicative life-span parameters.
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http://hdl.handle.net/10459.1/57122
DOI
https://doi.org/10.1099/mic.0.2007/009340-0
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Microbiology, 2007, vol. 153, núm. 11, p. 3667-3676
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