期刊
MOLECULAR BIOLOGY OF THE CELL
卷 22, 期 17, 页码 3127-3138出版社
AMER SOC CELL BIOLOGY
DOI: 10.1091/mbc.E10-12-1007
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资金
- European Research Council
- Israeli Science Foundation [1496/06, 1043/09]
The Msn2 and Msn4 transcription factors play major roles in the yeast general stress response by mediating the transcription of hundreds of genes. Despite extensive information on Msn2/4-mediated gene expression profiles, much less is known regarding the network of proteins that regulate its activity. Here we describe a systematic approach designed to examine the roles of 35 Msn2/4 partners in regulating Msn2/4 transcriptional activity in the face of four different environmental conditions. Our analysis indicates that single deletions of 26 Msn2/4 partners significantly affect Msn2/4 transcription activity under four different conditions. The low functional redundancy of the Msn2 regulatory network indicates that Msn2/4 activity is finely tuned by many of Msn2/4 partners to provide an optimized stress response through differential activation, nuclear localization, degradation, and chromatin remodeling. Our specific analysis of Msn2 activity showed that a relatively large number of partners act to suppress Msn2 activity under nonstress conditions through independent mechanisms, including cytoplasmic retention, proteosome-mediated Msn2 degradation, and chromatin remodeling. Such negative regulation is crucial to minimize the cost of uncontrolled stress response gene expression and ensures a high growth rate in the absence of stress.
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