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10:59
Analysis of Translation Initiation During Stress Conditions by Polysome Profiling
Published on: May 19, 2014
Protor-2 interacts with tristetraprolin to regulate mRNA stability during stress
Brent Holmes1, Nicholas Artinian, Lauren Anderson
1Department of Research & Development, Greater Los Angeles Veterans Affairs Healthcare System, Los Angeles, California 91343, USA.
Cellular Signalling
|October 4, 2011
Summary
Protor-2 interacts with tristetraprolin (TTP) to enhance the destabilization of specific mRNAs, linking mTORC2 signaling to RNA turnover and stress granule formation. This discovery reveals a novel regulatory pathway for immune and growth-related gene expression.
Area of Science:
- Molecular Biology
- RNA Metabolism
- Signal Transduction
Background:
- Tristetraprolin (TTP) is an RNA-binding protein that destabilizes AU-rich mRNAs, regulating immune and cell growth proteins.
- TTP also mediates stress-induced mRNA decay.
- The mTORC2 kinase complex plays roles in cell signaling, apoptosis, and integrity.
Purpose of the Study:
- To investigate the interaction between TTP and Protor-2, a component of mTORC2.
- To determine the functional consequences of this interaction on TTP-mediated mRNA turnover.
- To explore the link between mTORC2 activity and TTP-regulated mRNA stability.
Main Methods:
- Yeast two-hybrid screening to identify TTP interactors.
- Co-immunoprecipitation assays to confirm in vivo interactions.
- Overexpression and RNA interference (RNAi) studies in Jurkat cells to assess mRNA turnover.
- Analysis of TTP localization to stress granules (SG) and processing bodies (P-bodies).
Main Results:
- Protor-2 was identified as a TTP interactor.
- Protor-2 overexpression stimulated TTP-mediated turnover of specific mRNAs (TNF-α, GM-CSF, IL-3, COX-2).
- Protor-2 knockdown inhibited TTP-mediated mRNA turnover and TTP's association with SGs/P-bodies during stress response.
Conclusions:
- Protor-2 associates with TTP to accelerate TTP-mediated mRNA turnover.
- This interaction functionally links TTP-regulated mRNA stability to mTORC2 activity.
- Protor-2 may act as a bridge connecting mTORC2 signaling pathways with mRNA decay machinery.
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