Hmo1 is required for TOR-dependent regulation of ribosomal protein gene transcription

Axel B. Berger, Laurence Decourty, Gwenaël Badis, Ulf Nehrbass*, Alain Jacquier, Olivier Gadal

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

71 Citations (Scopus)


Ribosome biogenesis requires equimolar amounts of four rRNAs and all 79 ribosomal proteins (RP). Coordinated regulation of rRNA and RP synthesis by eukaryotic RNA polymerases (Pol) I, III, and II is a key requirement for growth control. Using a novel global genetic approach, we showed that the absence of Hmo1 becomes lethal when combined with mutations of components of either the RNA Pol II or Pol I transcription machineries, of specific RP, or of the TOR pathway. Hmo1 directly interacts with both the region transcribed by Pol I and a subset of RP gene promoters. Down-regulation of Hmo1 expression affects RP gene expression. Upon TORC1 inhibition, Hmo1 dissociates from ribosomal DNA (rDNA) and some RP gene promoters simultaneously. Finally, in the absence of Hmo1, TOR-dependent repression of RP genes is alleviated. Therefore, we show here that Saccharomyces cerevisiae Hmo1 is directly involved in coordinating rDNA transcription by Pol I and RP gene expression by Pol II under the control of the TOR pathway.

Original languageEnglish
Pages (from-to)8015-8026
Number of pages12
JournalMolecular and Cellular Biology
Issue number22
Publication statusPublished - Nov 2007
Externally publishedYes


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