Translational Complex Isolation
Translational Complex Isolation - Related Videos
10:07
Identification of Post-translational Modifications of Plant Protein Complexes
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Cited by 8 •
2014
We describe here a protocol for the purification and characterization of plant protein complexes. We demonstrate that by immunoprecipitating a single protein within a complex, so we can identify its post-translational modifications and its interacting partners.
14:29
Rapid In Vivo Fixation and Isolation of Translational Complexes from Eukaryotic Cells
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Cited by 4 •
2021
We present a technique to rapidly stabilize translational (protein biosynthesis) complexes with formaldehyde crosslinking in live yeast and mammalian cells. The approach enables dissecting transient intermediates and dynamic RNA:protein interactions. The crosslinked complexes can be used in multiple downstream applications such as in deep sequencing-based profiling methods, microscopy, and mass-spectrometry.
11:19
Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Cited by 2 •
2011
A major impediment to biochemical analyses of ribosomes containing nascent peptidyl-tRNAs has been the presence of other ribosomes in the same samples, ribosomes not involved in the translation of the specific mRNA sequence being analyzed. We developed a simple methodology to purify, exclusively, the ribosomes containing the nascent peptidyl-tRNA of interest.
02:33
Initiation of Translation
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2020
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs. First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
FAQs
The central technical challenge is preserving ribosome-messenger RNA-nascent polypeptide associations during cell lysis. When these relationships remain intact, researchers can examine translation in a state that reflects ongoing protein synthesis rather than analyzing only separated components. This preservation also retains information about associated factors that may influence ribosome activity or translation regulation.
Density-based separation resolves cellular material according to differences that allow intact translational complexes to be distinguished from free components. The resulting fractions provide a biochemical means of separating assemblies from unassociated molecules. Researchers can then compare these fractions to determine which material contains ribosome-associated translation intermediates and which represents cellular components outside those assemblies.
Preserved complexes can provide information about ribosome activity, translation regulation, and protein synthesis intermediates. Because ribosomes remain associated with messenger RNA, nascent polypeptides, and other factors, analysis can address how translation-related components occur together. This supports investigation of molecular relationships that would be difficult to assess after the assemblies had fully dissociated.
A typical workflow begins with cell lysis designed to retain translation-associated assemblies, followed by biochemical fractionation. Density-based separation can then distinguish intact complexes from free cellular material. Researchers collect the separated material for downstream analysis, using the resulting fractions to characterize ribosome activity, associated factors, or intermediates of protein synthesis.
Isolated material can serve as structural and biochemical material for downstream analysis. Researchers may use it to characterize ribosome activity, examine translation regulation, investigate protein synthesis intermediates, and assess interactions with associated factors. The value of the preparation therefore extends beyond separation itself, providing molecular material for studying how translation-related assemblies are organized and functioning.
This approach is useful when a study needs to connect molecular translation assemblies with broader changes in gene expression, cellular responses, or disease mechanisms. By preserving and separating complexes for analysis, researchers can examine translation-related material in a biochemical context. The method therefore supports both fundamental studies of protein synthesis and investigations of biologically significant cellular conditions.