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Analysis of the TORC1 interactome reveals a spatially distinct function of TORC1 in mRNP complexes.

ABSTRACT: The target of rapamycin complex 1 (TORC1) is mainly localized to the vacuolar membrane and regulates eukaryotic cell growth in response to nutrient availability. To obtain deeper insights into the functional roles of TORC1, we performed a genome-wide analysis of the TORC1 interactome in yeast using the bimolecular fluorescence complementation (BiFC) assay. We found that while most of the BiFC signals are observed at the vacuolar membrane, a fraction of them are detected at cytoplasmic messenger ribonucleoprotein (mRNP) granules. Moreover, mRNA-binding proteins are enriched in the TORC1 interactome, suggesting a functional relationship between TORC1 and mRNA metabolism. We show that a portion of TORC1 is consistently associated with mRNP complexes and interacts with a specific subset of mRNAs. We also demonstrate that TORC1 directly targets a translational repressor Scd6 and that the activity of Scd6 is inhibited by TORC1-dependent phosphorylation. Collectively, our data suggest that TORC1 plays a novel role in posttranscriptional regulation by controlling the activity of Scd6.

SUBMITTER: Chang Y

PROVIDER: S-EPMC7879482 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Structure-based engineering of Tor complexes reveals that two types of yeast TORC1 produce distinct phenotypes.

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The Cellular EJC Interactome Reveals Higher-Order mRNP Structure and an EJC-SR Protein Nexus

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The Cellular EJC Interactome Reveals Higher-Order mRNP Structure and an EJC-SR Protein Nexus

2012-10-18 | E-GEOD-41154 | biostudies-arrayexpress

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