Related Experiment Video
Updated: Mar 18, 2026
14:29
Rapid In Vivo Fixation and Isolation of Translational Complexes from Eukaryotic Cells
Published on: December 25, 2021
4.9K
Upstream Open Reading Frames Differentially Regulate Gene-specific Translation in the Integrated Stress Response.
1From the Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202-5126.
The Journal of Biological Chemistry
|July 1, 2016
Summary
Short, upstream open reading frames (uORFs) control protein synthesis during cellular stress. These uORFs fine-tune translation, crucial for cell survival under environmental challenges.
Area of Science:
- Molecular Biology
- Cellular Biology
- Genetics
Background:
- Translation initiation is a key regulatory point in gene expression.
- Upstream open reading frames (uORFs) in mRNA 5'-leaders can influence translation.
- The integrated stress response (ISR) globally reduces translation initiation via eIF2 phosphorylation.
Purpose of the Study:
- To review the mechanisms by which uORFs regulate translation.
- To highlight the role of uORFs in stress response and cell fate.
- To present features of uORFs that optimize translational control.
Main Methods:
- Literature review of studies on translation regulation and uORFs.
- Analysis of uORF characteristics in stress-related transcripts.
- Integration of findings on ISR signaling and translational control.
Main Results:
- uORFs are preferentially translated during ISR activation.
- uORF selection is a key mechanism for stress-ameliorating transcript translation.
- Specific uORF features enhance their role in translational control.
Conclusions:
- uORF-mediated translation is essential for cellular adaptation to stress.
- Translational control via uORFs is critical for regulating cell fate.
- Understanding uORF function provides insights into stress response pathways.
Related Concept Videos
01:29Translational Regulation
763
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
763
01:23Stringent Response in E. coli
457
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
457
01:31Regulation of the Unfolded Protein Response
3.2K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
3.2K
01:30Other Stress Responses in Bacteria
500
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
500
01:23Regulation of Expression at Multiple Steps
1.5K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.5K
02:28Leaky Scanning
5.8K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.8K