Related Experiment Videos
Processing bodies require RNA for assembly and contain nontranslating mRNAs.
Daniela Teixeira1, Ujwal Sheth, Marco A Valencia-Sanchez
1Department of Molecular and Cellular Biology & Howard Hughes Medical Institute, University of Arizona, Tucson, AZ 85721-0106, USA.
RNA (New York, N.Y.)
|February 11, 2005
Summary
Processing bodies (P-bodies) are dynamic cellular structures containing untranslating mRNAs. Their formation depends on RNA, and they play roles in cellular stress responses beyond mRNA degradation.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Processing bodies (P-bodies) are cytoplasmic foci concentrating mRNA decay factors.
- The physical nature, relationship to translation, and cellular roles of P-bodies are not fully understood.
Purpose of the Study:
- To investigate the dynamic nature of yeast P-bodies.
- To determine the relationship between P-bodies, mRNA, and translation.
- To explore P-body functions in cellular stress responses.
Main Methods:
- In vivo and in vitro analyses of yeast P-bodies.
- Observation of P-body dynamics under various cellular conditions (glucose deprivation, osmotic stress, UV light, cell growth stages).
- Assessment of P-body association with translation machinery (initiation and elongation inhibitors).
Main Results:
- P-body formation is RNA-dependent.
- P-body number and size fluctuate with cellular stress and growth stage.
- Inhibition of translation initiation increases P-bodies, while inhibition of elongation dissociates them.
- P-bodies lack certain translation factors and ribosomal proteins.
Conclusions:
- Yeast P-bodies are dynamic structures containing nontranslating mRNAs.
- P-bodies are involved in cellular responses to stress.
- P-bodies have biological roles beyond mRNA degradation.