Journal of Microbiology

Journal Article

HST1 increases replicative lifespan of a sir2Δ mutant in the absence of PDE2 in Saccharomyces cerevisiae: Woo Kyu Kang , Mayur Devare , Jeong-Yoon Kim; J. Microbiol. 2017;55(2):123-129. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6535-z

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Silent information regulator 2 (Sir2), which is the founding member of the sirtuin family of proteins, is a pro-longevity factor for replicative lifespan (RLS) in Saccharomyces cerevisiae. Sir2 is required for transcriptional silencing at mating type loci, telomeres, and rDNA loci. Sir2 also represses transcription of highly expressed growth-related genes, such as PMA1 and some ribosomal protein genes. Although the Sir2 paralogues Hst1, Hst2, Hst3, and Hst4 occur in S. cerevisiae, none of them could replace the transcriptional regulation of PMA1 by Sir2 in the wild type. In this study, we demonstrate that Hst1, the closest Sir2 paralogue, deacetylates the acetylated lysine 16 of histone H4 (H4K16Ac) and represses PMA1 transcription in the sir2Δ pde2Δ mutant. We further show that Hst1 plays a role in extending the RLS of the sir2Δ pde2Δ mutant. Collectively, our results suggest that Hst1 can substitute for Sir2 by deacetylating H4K16Ac only in the sir2Δ pde2Δ.

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Research Support, Non-U.S. Gov't

Growth Phase-dependent Roles of Sir2 in Oxidative Stress Resistance and Chronological Lifespan in Yeast: Woo Kyu Kang , Yeong Hyeock Kim , Byoung-Soo Kim , Jeong-Yoon Kim; J. Microbiol. 2014;52(8):652-658. Published online July 5, 2014; DOI: https://doi.org/10.1007/s12275-014-4173-2

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Abstract

Silent Information Regulator 2 (Sir2), a conserved NAD+- dependent histone deacetylase, has been implicated as one of the key factors in regulating stress response and longevity. Here, we report that the role of Sir2 in oxidative stress resistance and chronological lifespan is dependent on growth phase in yeast. In exponential phase, sir2Δ cells were more resistant to H2O2 stress and had a longer chronological lifespan than wild type. By contrast, in post-diauxic phase, sir2Δ cells were less resistant to H2O2 stress and had a shorter chronological lifespan than wild type cells. Similarly, the expression of antioxidant genes, which are essential to cope with oxidative stress, was regulated by Sir2 in a growth phasedependent manner. Collectively, our findings highlight the importance of the metabolic state of the cell in determining whether Sir2 can protect against or accelerate cellular aging of yeast.

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The intricate role of Sir2 in oxidative stress response during the post-diauxic phase in Saccharomyces cerevisiae
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Frontiers in Microbiology.2023;[Epub] CrossRef
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GigaScience.2018;[Epub] CrossRef
HST1 increases replicative lifespan of a sir2Δ mutant in the absence of PDE2 in Saccharomyces cerevisiae
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Journal of Microbiology.2017; 55(2): 123. CrossRef
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