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Yeast Life-span Extension by Calorie Restriction is Independent of NAD Fluctuation

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Journal Science
Specialty Science
Date 2003 Nov 8
PMID 14605207
Citations 60
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Abstract

Calorie restriction (CR) slows aging in numerous species. In the yeast Saccharomyces cerevisiae, this effect requires Sir2, a conserved NAD+-dependent deacetylase. We report that CR reduces nuclear NAD+ levels in vivo. Moreover, the activity of Sir2 and its human homologue SIRT1 are not affected by physiological alterations in the NAD+:NADH ratio. These data implicate alternate mechanisms of Sir2 regulation by CR.

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