Abstract
Perturbations in secretory function activate stress response pathways critical for yeast survival. Here we report the identification of the Hos2p/Set3p deacetylase complex (SET3C) as an essential component of the secretory stress response. Strains lacking core components of the Hos2p/Set3p complex exhibit hypersensitivity to secretory stress. Although not required for the unfolded protein response (UPR) and ribosomal gene repression, the Hos2p complex is required for proper activation of the Mpk1p/Slt2p cell integrity kinase cascade. Disruption of the Hos2p complex results in abrogated Mpk1p phosphorylation, whereas constitutive activation of the Mpk1p pathway rescues the hos2Delta mutant growth defect in response to secretory stress. Furthermore, Hos2p activity is required for the Mpk1p-mediated activation of stress-responsive transcription factor Rlm1p, but not for the stress-induced degradation of the C-type cyclin Ssn8p. Our results identify the Hos2p complex as a critical component of the secretory stress response and support the existence a coordinated stress response consisting of the UPR, ribosomal gene repression, and mitogen-activated protein kinase signaling in response to defects in secretory function.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Antimetabolites / pharmacology
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Basic-Leucine Zipper Transcription Factors / genetics
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Basic-Leucine Zipper Transcription Factors / metabolism
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Gene Expression Regulation, Fungal*
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Histone Deacetylases / genetics
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Histone Deacetylases / metabolism*
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MADS Domain Proteins
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Mitogen-Activated Protein Kinases / genetics
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Mitogen-Activated Protein Kinases / metabolism*
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Mutation
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Phenotype
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Repressor Proteins / genetics
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Repressor Proteins / metabolism
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Ribosomal Proteins / genetics
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Ribosomal Proteins / metabolism
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Saccharomyces cerevisiae / drug effects
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Saccharomyces cerevisiae / genetics
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Saccharomyces cerevisiae / physiology*
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Saccharomyces cerevisiae Proteins / genetics
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Saccharomyces cerevisiae Proteins / metabolism*
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Signal Transduction*
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Transcription Factors / genetics
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Transcription Factors / metabolism
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Tunicamycin / pharmacology
Substances
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Antimetabolites
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Basic-Leucine Zipper Transcription Factors
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HAC1 protein, S cerevisiae
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MADS Domain Proteins
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RLM1 protein, S cerevisiae
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Repressor Proteins
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Ribosomal Proteins
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Saccharomyces cerevisiae Proteins
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Transcription Factors
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Tunicamycin
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Mitogen-Activated Protein Kinases
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SLT2 protein, S cerevisiae
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HOS2 protein, S cerevisiae
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Set3 protein, S cerevisiae
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Histone Deacetylases