title: Yeast hEST1A/B (SMG5/6)-like proteins contribute to environment-sensing adaptive gene expression responses.
abstract: During its natural life cycle, budding yeast (Saccharomyces cerevisiae) has to adapt to drastically changing environments, but how environmental-sensing pathways are linked to adaptive gene expression changes remains incompletely understood. Here, we describe two closely related yeast hEST1A-B (SMG5-6)-like proteins termed Esl1 and Esl2 that contain a 14-3-3-like domain and a putative PilT N-terminus ribonuclease domain. We found that, unlike their metazoan orthologs, Esl1 and Esl2 were not involved in nonsense-mediated mRNA decay or telomere maintenance pathways. However, in genome-wide expression array analyses, absence of Esl1 and Esl2 led to more than two-fold deregulation of ∼50 transcripts, most of which were expressed inversely to the appropriate metabolic response to environmental nutrient supply; for instance, normally glucose-repressed genes were derepressed in esl1Δ esl2Δ double mutants during growth in a high-glucose environment. Likewise, in a genome-wide synthetic gene array screen, esl1Δ esl2Δ double mutants were synthetic sick with null mutations for Rim8 and Dfg16, which form the environmental-sensing complex of the Rim101 pH response gene expression pathway. Overall, these results suggest that Esl1 and Esl2 contribute to the regulation of adaptive gene expression responses of environmental sensing pathways.
authors.affiliation: St. Vincent's Institute of Medical Research, Melbourne, Victoria 3065, Australia.
authors.forename: Xianning
authors.initials: X
authors.lastname: Lai
authors.forename: Traude
authors.initials: T
authors.lastname: Beilharz
authors.forename: Wei-Chun
authors.initials: WC
authors.lastname: Au
authors.forename: Andrew
authors.initials: A
authors.lastname: Hammet
authors.forename: Thomas
authors.initials: T
authors.lastname: Preiss
authors.forename: Munira A
authors.initials: MA
authors.lastname: Basrai
authors.forename: Jörg
authors.initials: J
authors.lastname: Heierhorst
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics; D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins; D044783:F-Box Proteins / Q000235:genetics / Q000378:metabolism; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D019098:Telomerase / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D043743:Ubiquitin-Protein Ligase Complexes / Q000235:genetics / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D018797:Cell Cycle Proteins; C000589014:Esl1 protein, S cerevisiae; D044783:F-Box Proteins; D047908:Intracellular Signaling Peptides and Proteins; C470285:MET30 protein, S cerevisiae; C489601:RIM101 protein, S cerevisiae; D012333:RNA, Messenger; D012097:Repressor Proteins; C547024:Rim8 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D043743:Ubiquitin-Protein Ligase Complexes; C509185:EST2 protein, S cerevisiae; D019098:Telomerase
keywords: SMG5; SMG6; gene expression; genetic interactions; hEST1
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