The Ccr4-Not complex is a conserved global regulator of gene expression, which serves as a regulatory platform that senses and/or transmits nutrient and stress signals to various downstream effectors. Presumed effectors of this complex in yeast are TFIID, a general transcription factor that associates with the core promoter, and Msn2, a key transcription factor that regulates expression of stress-responsive element (STRE)-controlled genes. Here we show that the constitutively high level of STRE-driven expression in ccr4-not mutants results from two independent effects. Accordingly, loss of Ccr4-Not function causes a dramatic Msn2-independent redistribution of TFIID on promoters with a particular bias for STRE-controlled over ribosomal protein gene promoters. In parallel, loss of Ccr4-Not complex function results in an alteration of the posttranslational modification status of Msn2, which depends on the type 1 protein phosphatase Glc7 and its newly identified subunit Bud14. Tests of epistasis as well as transcriptional analyses of Bud14-dependent transcription support a model in which the Ccr4-Not complex prevents activation of Msn2 via inhibition of the Bud14/Glc7 module in exponentially growing cells. Thus, increased activity of STRE genes in ccr4-not mutants may result from both altered general distribution of TFIID and unscheduled activation of Msn2.

• PMID: 15601868
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Reference Type

Journal Article | Research Support, Non-U.S. Gov't

Authors

Lenssen E, James N, Pedruzzi I, Dubouloz F, Cameroni E, Bisig R, Maillet L, Werner M, Roosen J, Petrovic K, ... Show all

Primary Lit For

BUD14 | GLC7 | General transcription factor complex TFIID | BUD14-GLC7 phosphatase complex

Additional Lit For

CCR4 | CDC36 | TAF1 | TAF8 | SPT15 | NOT5 | MSN2 | REG1-GLC7 phosphatase complex | REG2-GLC7 phosphatase complex

Review For