Rewiring AMPK and mitochondrial retrograde signaling for metabolic control of aging and histone acetylation in respiratory-defective cells

Cell Rep. 2014 Apr 24;7(2):565-574. doi: 10.1016/j.celrep.2014.03.029. Epub 2014 Apr 13.

Abstract

Abnormal respiratory metabolism plays a role in numerous human disorders. We find that regulation of overall histone acetylation is perturbed in respiratory-incompetent (ρ(0)) yeast. Because histone acetylation is highly sensitive to acetyl-coenzyme A (acetyl-CoA) availability, we sought interventions that suppress this ρ(0) phenotype through reprogramming metabolism. Nutritional intervention studies led to the discovery that genetic coactivation of the mitochondrion-to-nucleus retrograde (RTG) response and the AMPK (Snf1) pathway prevents abnormal histone deacetylation in ρ(0) cells. Metabolic profiling of signaling mutants uncovered links between chromatin-dependent phenotypes of ρ(0) cells and metabolism of ATP, acetyl-CoA, glutathione, branched-chain amino acids, and the storage carbohydrate trehalose. Importantly, RTG/AMPK activation reprograms energy metabolism to increase the supply of acetyl-CoA to lysine acetyltransferases and extend the chronological lifespan of ρ(0) cells. Our results strengthen the framework for rational design of nutrient supplementation schemes and drug-discovery initiatives aimed at mimicking the therapeutic benefits of dietary interventions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetyl Coenzyme A / metabolism
  • Acetylation
  • Cell Nucleus / metabolism
  • Cell Respiration*
  • Histones / metabolism*
  • Mitochondria / metabolism
  • Oxidative Stress
  • Protein Processing, Post-Translational*
  • Protein-Serine-Threonine Kinases / genetics
  • Protein-Serine-Threonine Kinases / metabolism*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / growth & development
  • Saccharomyces cerevisiae / metabolism*
  • Signal Transduction
  • Time Factors

Substances

  • Histones
  • Acetyl Coenzyme A
  • SNF1-related protein kinases
  • Protein-Serine-Threonine Kinases