Small toxic protein encoded on chromosome VII of Saccharomyces cerevisiae

Koji Makanae, Reiko Kintaka, Koji Ishikawa, Hisao Moriya

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In a previous study, we found an unknown element that caused growth inhibition after its copy number increased in the 30 region of DIE2 in Saccharomyces cerevisiae. In this study, we further identified this element and observed that overexpression of a small protein (sORF2) of 57 amino acids encoded in this region caused growth inhibition. The transcriptional response and multicopy suppression of the growth inhibition caused by sORF2 overexpression suggest that sORF2 overexpression inhibits the ergosterol biosynthetic pathway. sORF2 was not required in the normal growth of S. cerevisiae, and not conserved in related yeast species including S. paradoxus. Thus, sORF2 (designated as OTO1) is an orphan ORF that determines the specificity of this species.

Original languageEnglish
Article numbere0120678
JournalPloS one
Issue number3
Publication statusPublished - Mar 17 2015

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • General


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