Crude Virion Extraction
Crude Virion Extraction - Related Videos
08:56
Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
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2018
Here we present a new approach to identify plant viruses with double-strand DNA genomes. We use standard methods to extract DNA and RNA from infected leaves and carry out next-generation sequencing. Bioinformatic tools assemble sequences into contigs, identify contigs representing virus genomes and assign genomes to taxonomic groups.
03:58
Preparation of Crude Cell Extract from Vibrio natriegens
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the preparation of a cell extract from Vibrio natriegens, a rapidly growing bacterium known for its high protein synthesis rate. The bacterial pellet is washed and resuspended in lysis buffer before sonication on ice to prevent cellular degradation. The lysate is centrifuged to separate insoluble cell debris, and the cell extract is...
03:32
Cell-Free Protein Expression Using a Bacterial Crude Cell Extract
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the use of a bacterial cell-free protein expression system based on Vibrio natriegens crude lysate to perform coupled in vitro transcription and translation. It highlights the preparation of a master mix with essential components and the step-by-step synthesis of functional proteins from a DNA template.
09:18
Assessing the Putative Anticryptococcal Properties of Crude and Clarified Extracts from Mollusks
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Cited by 3 •
2022
The human fungal pathogen Cryptococcus neoformans produces a variety of virulence factors (e.g., peptidases) to promote its survival within the host. Environmental niches represent a promising source of novel natural peptidase inhibitors. This protocol outlines the preparation of extracts from mollusks and the assessment of their effect on fungal virulence factor production.
12:12
Identification of Hemolytic and Phospholipase Activity in Crude Extracts from Sea Anemones by Straightforward Bioassays
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2022
Here, we describe a protocol to obtain crude venom extract from sea anemone and detect its hemolytic and phospholipase activity.
FAQs
Chemical or mechanical lysis releases material from infected cells or biological samples, creating a mixture that contains virions alongside disrupted cellular components. Clarification then uses centrifugation or filtration to remove cell debris while retaining the liquid fraction containing particles. This separation improves usability without providing the selectivity of a fully purified preparation.
Clarification does not remove every nonviral component. Host proteins and other contaminants can remain in the virion-containing liquid, so downstream measurements may reflect both viral and sample-derived material. This limitation matters when interpreting abundance or composition and helps determine whether a later purification step is necessary for high specificity or structural resolution.
The choice between chemical and mechanical lysis represents a process variable rather than a cosmetic difference. Both approaches release virus-containing material, but the resulting preparation must be considered in relation to particle stability and the planned analysis. Crude virion extraction is therefore useful for preliminary work, while especially sensitive studies may require additional purification.
Crude virion extraction is favored when speed and accessible starting material matter more than maximum purity. A purified preparation is more appropriate when high specificity or structural resolution is required, because the crude liquid still contains host proteins and other contaminants. The practical distinction is therefore analytical purpose: preliminary characterization versus more selective measurements.
A basic workflow starts with an infected-cell or biological sample, applies chemical or mechanical lysis, and then clarifies the lysate by centrifugation or filtration. The retained virion-containing liquid becomes the working preparation. Its crude status should remain part of the interpretation, since debris is reduced but contaminants are not necessarily eliminated.
Researchers can use the preparation in infectivity assays, microscopy, nucleic-acid detection, and preliminary characterization. These applications examine different properties, including biological activity, visible particles, viral genetic material, or broad sample features. Because the material is not extensively purified, each result should be interpreted with awareness that host-derived components remain present.
In biology, the method supports rapid investigation of viral abundance, particle stability, and interactions with host cells. It can provide an initial view of a virus-containing sample before researchers decide whether more purification is justified. This makes it useful for exploratory studies and for selecting preparations suited to later, more specific analyses.