Viral Antigen Plasmids
Viral Antigen Plasmids - Related Videos
05:04
Viral Antigen Microarray Assay to Detect Antibody Isotypes in Serum Against Viral Antigen
0 Views •
2025
In this video, we demonstrate the process for detecting antibody isotypes in multiple human serum samples using a microarray slide printed with antigenic subtypes of influenza virus strains.
02:50
Suppressing Hepatitis B Virus Replication Using Viral Antigen-Specific T Cells
0 Views •
2025
The video demonstrates an assay using human induced pluripotent stem cell (iPSC)-derived CD8+ T cells to inhibit hepatitis B virus (HBV) replication in mice. These T cells, engineered with HBV-specific receptors, are transferred into transgenic mice. Replication-competent HBV genome plasmids are then injected directly into the liver, enabling viral DNA uptake. Once viral antigens are expressed and presented by hybrid MHC-I molecules, the engineered T cells recognize and bind to these complexes.
03:13
Immunostaining to Visualize Viral Antigen and Host Protein Colocalization in the Insect Gut
0 Views •
2026
Source: Zhang, L., et al. Immunofluorescent Labeling of Plant Virus and Insect Vector Proteins in Hemipteran Guts. J. Vis. Exp. (2021)The video demonstrates the preparation of gut tissue from a plant virus–infected insect vector for fluorescence imaging. Fixed guts were washed, permeabilized, and incubated with two fluorescent antibodies in a blocking solution—one targeting a viral antigen in vesicles, the other a vesicle-associated membrane protein. The tissue was counterstained for actin...
08:16
Plasmid Purification
0 Views •
2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
02:44
Generation of Recombinant Adeno-Associated Virus Through Plasmid Transfection
0 Views •
2026
Source: Ding, J., et al. Preparation of rAAV9 to Overexpress or Knockdown Genes in Mouse Hearts. J. Vis. Exp. (2016)This video demonstrates the production of recombinant adeno-associated virus particles through plasmid transfection in mammalian cells. It highlights the coordinated expression of Rep, Cap, and helper proteins that drive viral genome replication and capsid assembly within the nucleus.
FAQs
After introduction into suitable host cells, the plasmid directs the cells’ transcription and translation machinery to produce the encoded viral protein. This controlled expression provides material for examining antigen structure, immune recognition, and functional activity under defined laboratory conditions. The approach allows researchers to connect a selected viral sequence with measurable molecular or immunological properties.
Viral antigen plasmids can be designed with targeted changes to antigen sequences, allowing researchers to compare variants under controlled conditions. Such comparisons can reveal how sequence differences relate to antigen structure, immune recognition, or functional activity. This design flexibility also supports focused investigation of particular viral protein features rather than treating all variants as equivalent.
The expressed viral protein provides an experimental antigen for studying two major forms of adaptive immune recognition. Researchers can evaluate how antibodies respond to the antigen and investigate related T-cell responses using the same defined construct. Examining these responses helps connect the molecular properties of a viral protein with immunological findings relevant to infection research.
A typical workflow begins by selecting or modifying a plasmid sequence that encodes the viral antigen, introducing the construct into suitable host cells, and allowing the cells to express the protein. The resulting antigen can then be analyzed for structure, immune recognition, or functional activity. These stages provide a defined path from construct design to experimental measurement.
They are useful when researchers need a controlled source of a viral antigen for evaluating diagnostic assays. Expression in suitable host cells produces the selected protein, which can then be examined for recognition by immune components relevant to the assay. Comparing constructs or viral variants can further support assessment of how antigen sequence affects diagnostic performance.
In vaccine development, researchers can use expressed viral antigens to study immune recognition and compare modified or variant sequences before selecting candidates for further investigation. In host-pathogen research, the same constructs support analysis of viral protein function and interactions with host immune responses. Together, these applications connect defined antigen designs with broader infection-related questions.