title: Reduced Histone Expression or a Defect in Chromatin Assembly Induces Respiration.
abstract: Regulation of mitochondrial biogenesis and respiration is a complex process that involves several signaling pathways and transcription factors as well as communication between the nuclear and mitochondrial genomes. Here we show that decreased expression of histones or a defect in nucleosome assembly in the yeast Saccharomyces cerevisiae results in increased mitochondrial DNA (mtDNA) copy numbers, oxygen consumption, ATP synthesis, and expression of genes encoding enzymes of the tricarboxylic acid (TCA) cycle and oxidative phosphorylation (OXPHOS). The metabolic shift from fermentation to respiration induced by altered chromatin structure is associated with the induction of the retrograde (RTG) pathway and requires the activity of the Hap2/3/4/5p complex as well as the transport and metabolism of pyruvate in mitochondria. Together, our data indicate that altered chromatin structure relieves glucose repression of mitochondrial respiration by inducing transcription of the TCA cycle and OXPHOS genes carried by both nuclear and mitochondrial DNA.
authors.affiliation: Department of Biological Sciences, St. John's University, Queens, New York, USA.
authors.forename: Luciano
authors.initials: L
authors.lastname: Galdieri
authors.affiliation: Department of Biological Sciences, St. John's University, Queens, New York, USA.
authors.forename: Tiantian
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Department of Biological Sciences, St. John's University, Queens, New York, USA.
authors.forename: Daniella
authors.initials: D
authors.lastname: Rogerson
authors.affiliation: Department of Biological Sciences, St. John's University, Queens, New York, USA vancuraa@stjohns.edu.
authors.forename: Ales
authors.initials: A
authors.lastname: Vancura
mesh_terms: D000255:Adenosine Triphosphate / Q000096:biosynthesis; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / Q000378:metabolism; D023081:CCAAT-Binding Factor / Q000378:metabolism; D042002:Chromatin Assembly and Disassembly; D056915:DNA Copy Number Variations; D004271:DNA, Fungal / Q000378:metabolism; D004272:DNA, Mitochondrial / Q000378:metabolism; D005285:Fermentation; D015966:Gene Expression Regulation, Fungal; D006657:Histones / Q000096:biosynthesis* / Q000235:genetics; D008928:Mitochondria / Q000378:metabolism*; D010085:Oxidative Phosphorylation; D010101:Oxygen Consumption; D019289:Pyruvic Acid / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism
chemical_list: D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D023081:CCAAT-Binding Factor; D004271:DNA, Fungal; D004272:DNA, Mitochondrial; C061437:HAP4 protein, S cerevisiae; D006657:Histones; C079378:RTG1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D019289:Pyruvic Acid; D000255:Adenosine Triphosphate