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Reference: Barbaric S, et al. (2007) Redundancy of Chromatin Remodeling Pathways for the Induction of the Yeast PHO5 Promoter in Vivo. J Biol Chem 282(38):27610-21

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Abstract

Induction of the yeast PHO5 and PHO8 genes leads to a prominent chromatin transition at their promoter regions as a prerequisite for transcription activation. Whereas induction of PHO8 is strictly dependent on Snf2 and Gcn5, there is no chromatin remodeler identified so far that would be essential for the opening of PHO5 promoter chromatin. Nonetheless, the non-essential but significant involvement of cofactors can be identified if the chromatin opening kinetics is delayed in respective mutants. Using this approach we have tested individually all 16 viable Snf2 type ATPase deletion mutants for their effect on PHO5 promoter induction and opening. Only the absence of Snf2 and Ino80 showed a strong delay in chromatin remodeling kinetics. The snf2 ino80 double mutation had a synthetic kinetic effect but eventually still allowed strong PHO5 induction. The same was true for the snf2 gcn5 and ino80 gcn5 double mutants. This strongly suggests a complex network of redundant and mutually independent parallel pathways that lead to the remodeling of the PHO5 promoter. Further, chromatin remodeling kinetics at a transcriptionally inactive TATA box mutated PHO5 promoter is not affected neither under wild type conditions nor in the absence of Snf2 or Gcn5. This demonstrates the complete independence of promoter chromatin opening on downstream PHO5 transcription processes. Finally, the histone variant Htz1 has no prominent role for the kinetics of PHO5 promoter chromatin remodeling.

Reference Type
Journal Article
Authors
Barbaric S, Luckenbach T, Schmid A, Blaschke D, Horz W, Korber P
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