Positive charge of arginine residues on histone H4 tail is required for maintenance of mating type in saccharomyces cerevisiae

Soojin Yeom, Junsoo Oh, Eun-Jin Lee, Jung Shin Lee

Research output: Contribution to journalArticle

Abstract

Transcriptional gene silencing is regulated by the chromatin structure, which is by various factors including histones. Saccharomyces cerevisiae contains transcriptionally silenced regions such as telomeric regions and hidden mating (HM) loci. The positively-charged amino acids on the histone H4 tail were reported to be critical for the telomeric silencing in yeast, by interacting with Dot1, a specific methyltransferase for the 79 th lysine on histone H3. However, Dot1 did not affect gene silencing within HM loci, but whether the positively-charged amino acids on the H4 tail affect HM silencing has not been defined. To elucidate the function of the H4 tail on HM silencing, we created several MATa-type yeast strains bearing the substitution of arginine with alanine or lysine on the histone H4 tail and checked the sensitivity of MATa-type yeast to alpha pheromone. The arginine point mutants substituted by alanine (R17A, R19A, and R23A) did not show sensitivity to alpha pheromone, but only two arginine mutants substituted by lysine (R17K and R19K) restored the sensitivity to alpha pheromone-like wild type. These data suggested that the basic property of arginine at 17 th and 19 th positions in the histone H4 tail is critical for maintaining HM silencing, but that of the 23 rd arginine is not. Our data implicated that the positive charge of two arginine residues on the histone H4 tail is required for HM silencing in a manner independent of Dot1.

Original languageEnglish
Pages (from-to)1573-1579
Number of pages7
JournalJournal of microbiology and biotechnology
Volume28
Issue number9
DOIs
Publication statusPublished - 2018 Sep 1
Externally publishedYes

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Keywords

  • Arginine residues
  • Histone H4
  • HM silencing
  • Saccharomyces cerevisiae

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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