Polyribosome Isolation
Polyribosome Isolation - Related Videos
09:16
Eukaryotic Polyribosome Profile Analysis
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Cited by 51 •
2010
This article describes a protocol for the extraction of translating ribosomes from eukaryotic cells. Once extracted, ribosomes are separated into monosomes and polyribosomes by sucrose gradient fractionation to allow different ribosomal populations to be analyzed. As such, this method is the gold standard for examining the regulation of translation.
09:13
In vivo Interrogation of Central Nervous System Translatome by Polyribosome Fractionation
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Cited by 14 •
2014
This protocol illustrates essential modifications of polyribosome fractionation in order to study the translatome of in vivo CNS samples. It allows global assessment of translation and transcription regulation through the isolation and comparison of total RNA to ribosome bound RNA fractions.
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
07:12
Neutrophil Isolation Protocol
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Cited by 173 •
2008
Neutrophils are among the first cells to arrive on the site of inflammatory immune response, and their functions and mechanisms have been studied extensively in vitro. We demonstrate a standard density gradient separation method to isolate human neutrophils from whole blood using commercially available separation media.
13:24
An Optimized Enrichment Technique for the Isolation of Arthrobacter Bacteriophage Species from Soil Sample Isolates
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Cited by 31 •
2015
We present an enrichment protocol for the isolation of bacteriophages infecting bacteria in the Arthrobacter genus. This enrichment protocol produces fast and reproducible results for the isolation and amplification of Arthrobacter phages from soil isolates.
FAQs
Separation depends on how complexes move through the sucrose density gradient during ultracentrifugation. Ribosome–mRNA assemblies with different sizes and sedimentation behavior migrate differently, producing distinguishable polyribosome profiles. This physical separation allows researchers to examine translating assemblies apart from other cellular components and assess how their distribution changes between experimental samples.
A stabilizing buffer helps preserve ribosome–mRNA assemblies during preparation. Maintaining these associations is essential because the isolated material must reflect groups of ribosomes engaged with the same messenger RNA rather than complexes disrupted before separation. Buffer stabilization therefore supports meaningful comparisons of translational activity and mRNA association across developmental samples or conditions.
Differences in polyribosome profiles can indicate altered translational activity, even when transcription has not changed. By comparing profiles from different developmental stages or conditions, researchers can investigate post-transcriptional regulation, meaning control that occurs after transcription. These comparisons help connect changes in mRNA translation with developmental outcomes such as differentiation or tissue formation.
The method provides information about which messenger RNAs are associated with active protein-synthesis assemblies, rather than measuring transcription alone. If polyribosome association changes between samples, researchers can identify a translational difference that may occur without altered transcription. This distinction is valuable for studying how developmental programs regulate gene expression at multiple molecular levels.
The workflow begins by preparing cellular material in a stabilizing buffer to preserve ribosome–mRNA assemblies. The preparation is then layered into a sucrose density gradient and subjected to ultracentrifugation. Because complexes migrate according to size and sedimentation behavior, the resulting separation produces polyribosome profiles that can be examined and compared between samples.
Researchers can apply it to embryonic development, cell differentiation, and tissue formation, especially when they need to examine changes in protein synthesis. Comparing isolated polyribosome profiles across developmental stages or experimental conditions can reveal stage-specific translational regulation and identify messenger RNAs associated with protein production during changing developmental states.