Mrna-protein Complex Purification
Mrna-protein Complex Purification - Related Videos
11:30
Tandem Affinity Purification of Protein Complexes from Eukaryotic Cells
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Cited by 7 •
2017
We describe here a novel, robust, and efficient tandem affinity purification (TAP) method for the expression, isolation, and characterization of protein complexes from eukaryotic cells. This protocol could be utilized for the biochemical characterization of discrete complexes as well as the identification of novel interactors and post-translational modifications that regulate their function.
14:58
Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Cited by 11 •
2012
Affinity purification of tagged proteins in combination with mass spectrometry (APMS) is a powerful method for the systematic mapping of protein interaction networks and for investigating the mechanistic basis of biological processes. Here, we describe an optimized sequential peptide affinity (SPA) APMS procedure developed for the bacterium Escherichia coli that can be used to isolate and characterize stable multi-protein complexes to near homogeneity even starting from low copy numbers per...
06:45
Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification (BiCAP)
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Cited by 4 •
2018
This manuscript describes the protocol for Bimolecular Complementation Affinity Purification (BiCAP). This novel method facilitates the specific isolation and downstream proteomic characterization of any two interacting proteins, while excluding un-complexed individual proteins as well as complexes formed with competing binding partners.
09:35
Purification and Visualization of Influenza A Viral Ribonucleoprotein Complexes
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Cited by 8 •
2009
The genome of the influenza A virus consists of eight separate complexes of RNA and proteins, termed viral ribonucleoprotein complexes (vRNPs). This paper describes the glycerol gradient purification and transmission electron microscopy visualization of influenza A vRNPs.
02:41
Protein Complex Assembly
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2020
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes. Many viruses self-assemble into a fully functional unit using the infected host cell to...
FAQs
Preservation depends on carrying out cell lysis, fractionation, and separation under conditions that limit complex dissociation. This allows messenger RNA to remain associated with its bound proteins rather than becoming separated during handling. Maintaining these interactions is important because the resulting preparation can more closely represent regulatory assemblies present in the cell and support interpretation of RNA function.
Separating complexes from unbound RNA and proteins enriches molecules that are physically associated with the messenger RNA. Affinity capture, centrifugation, or chromatography can provide this separation, although each approach uses a different physical basis. Enrichment improves the ability to distinguish interaction partners from free cellular components and supports more focused analysis of post-transcriptional regulatory assemblies.
Analysis can connect specific RNA-associated proteins with post-transcriptional processes, including mRNA stability, localization, translation, and degradation. Examining both RNA and protein components helps researchers characterize regulatory assemblies rather than studying either molecule in isolation. These findings can clarify how cells control gene expression after transcription and how RNA-associated interactions influence messenger RNA behavior.
The main concern is whether handling conditions preserve the interaction throughout cell lysis, fractionation, and separation. Conditions that promote complex dissociation can reduce recovery of genuine assemblies and alter the observed protein partners. Consequently, the selected purification strategy and the way each processing step is performed directly influence how faithfully the isolated material reflects native RNA-protein organization.
A typical workflow begins with cell lysis, followed by fractionation to prepare the relevant material while limiting disruption of RNA-protein interactions. The complexes are then separated from unbound molecules by affinity capture, centrifugation, or chromatography. Finally, the recovered material is examined through RNA and protein analyses to identify associated components and characterize the purified assemblies.
Researchers would use it when they need to identify proteins associated with messenger RNA or investigate how those associations regulate RNA behavior. The method is especially relevant to studies of post-transcriptional regulation, where changes in stability, localization, translation, or degradation must be connected to RNA-bound proteins. It therefore supports mechanistic investigations of RNA-based control of gene expression.