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Isolation of mRNAs Associated with Yeast Mitochondria to Study Mechanisms of Localized Translation
Published on: March 14, 2014
Global analysis of yeast mRNPs.
Sarah F Mitchell1, Saumya Jain, Meipei She
1Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA.
Nature Structural & Molecular Biology
|December 11, 2012
Summary
Researchers identified 120 mRNA-binding proteins in yeast, including 66 novel ones involved in various cellular functions. These proteins dynamically change location during stress, aiding in the formation of stress granules and processing bodies (P bodies).
Area of Science:
- Molecular Biology
- Yeast Genetics
- RNA Biology
Background:
- Proteins are crucial for regulating gene expression through mRNA metabolism.
- Understanding mRNA-protein complexes (mRNPs) is key to deciphering these regulatory mechanisms.
Purpose of the Study:
- To comprehensively identify and characterize mRNA-binding proteins in Saccharomyces cerevisiae.
- To investigate the dynamic localization and assembly of mRNPs, particularly in processing bodies (P bodies) during cellular stress.
Main Methods:
- Global survey of mRNA-binding proteins using cross-linking techniques.
- Identification of novel mRNA-binding proteins.
- Cross-linking and immunoprecipitation (CLIP) analyses of specific P-body components (Pat1, Lsm1, Dhh1, Sbp1).
Main Results:
- Identified 120 mRNA-binding proteins, with 66 being novel discoveries.
- These proteins encompass diverse functions including kinases, RNA-modification enzymes, and metabolic enzymes.
- Observed dynamic subcellular localization of these proteins, including assembly into stress granules and P bodies under stress conditions.
- CLIP analysis revealed specific mRNA interaction sites and positional binding preferences for P-body components.
Conclusions:
- Defines the major mRNP protein landscape in yeast.
- Highlights dynamic changes in protein localization during stress responses.
- Provides insights into the assembly rules governing P-body mRNPs.
