title: The fission yeast php2 mutant displays a lengthened chronological lifespan.
abstract: The Schizosaccharomyces pombe php2(+) gene encodes a subunit of the CCAAT-binding factor complex. We found that disruption of the php2(+) gene extended the chronological lifespan of the fission yeast. Moreover, the lifespan of the Δphp2 mutant was barely extended under calorie restricted (CR) conditions. Many other phenotypes of the Δphp2 mutant resembled those of wild-type cells grown under CR conditions, suggesting that the Δphp2 mutant might undergo CR. The mutant also showed low respiratory activity concomitant with decreased expression of the cyc1(+) and rip1(+) genes, both of which are involved in mitochondrial electron transport. On the basis of a chromatin immunoprecipitation assay, we determined that Php2 binds to a DNA region upstream of cyc1(+) and rip1(+) in S. pombe. Here we discuss the possible mechanisms by which the chronological lifespan of Δphp2 mutant is extended.
authors.affiliation: Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Nagoya 464-8601, Japan.
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Takuma
authors.forename: Hokuto
authors.initials: H
authors.lastname: Ohtsuka
authors.forename: Kenko
authors.initials: K
authors.lastname: Azuma
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Murakami
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Aiba
mesh_terms: D023081:CCAAT-Binding Factor / Q000235:genetics*; D003470:Culture Media / Q000737:chemistry; D004579:Electron Transport / Q000187:drug effects / Q000235:genetics; D005947:Glucose / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D012568:Schizosaccharomyces / Q000166:cytology / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics* / Q000378:metabolism; D017384:Sequence Deletion; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects / Q000235:genetics
chemical_list: D023081:CCAAT-Binding Factor; D003470:Culture Media; C586422:Php2 protein, S pombe; D029702:Schizosaccharomyces pombe Proteins; D006861:Hydrogen Peroxide; D020928:Mitogen-Activated Protein Kinases; C095409:sty1 protein, S pombe; D005947:Glucose