Ha Protein
Ha Protein - Related Videos
03:03
Measuring the Activation of Fc-Mediated Effector Functions by HA Antibodies
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2025
This video demonstrates an assay measuring the antibody-mediated activation of T cell effector functions. Adding an influenza virus hemagglutinin (HA)-specific monoclonal antibody to transfected mammalian cells expressing HA results in the formation of immune complexes with HA. Upon introducing engineered T cells expressing Fc receptors and a luciferase reporter, the T cells are activated by the antibody-HA complexes, and this activation is detected by adding a luciferase substrate and...
06:08
Application of Ha-CoV-2 Pseudovirus for Rapid Quantification of SARS-CoV-2 Variants and Neutralizing Antibodies
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2023
This protocol describes the application of a novel hybrid alphavirus-SARS-CoV-2 pseudovirus (Ha-CoV-2) as a platform for rapid quantification of infectivity of SARS-CoV-2 variants and their sensitivity to neutralizing antibodies.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 33 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
07:16
Immunoprecipitation with an Anti-Epitope Tag Affinity Gel to Study Protein-Protein Interactions
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Cited by 1 •
2024
Protein-protein interactions are important for elucidating the function of target proteins, and co-immunoprecipitation (co-IP) can easily confirm PPIs. We transiently transfected a plasmid encoding an epitope-tagged protein into HEK-293 cells and developed an immunoprecipitation method to easily confirm the binding of two target proteins.
10:01
In vitro Methylation Assay to Study Protein Arginine Methylation
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Cited by 8 •
2014
Protein arginine methylation, catalyzed by a class of enzymes viz., protein arginine methyl transferases (PRMTs), is the process of enzymatic addition of methyl group(s) to arginines within proteins. The in vitro methylation assay is the most dependable tool for assessing the methylation status of known or novel PRMT substrates.
FAQs
The key event is an acid-triggered structural rearrangement after the virus enters an endosome. This change converts receptor-bound Ha protein into a fusion-active form, allowing the viral envelope and endosomal membrane to merge. Studying this transition helps explain how influenza infection proceeds after attachment and provides a mechanistic framework for investigating viral entry.
Binding to sialic acid receptors provides the recognition step that links a viral particle to a host-cell membrane. This interaction helps determine which cells can be engaged before internalization occurs. Consequently, receptor recognition is important in studies of influenza infection and in investigations of how viral changes may influence host range.
When researchers examine antigenic variation, they can ask whether changes in Ha protein affect recognition by antibodies and contribute to immune escape. This makes the protein useful for connecting molecular variation with differences in influenza biology. Such studies also clarify why antibody responses are central when evaluating changes in viral properties.
Ha protein serves as a major target of antibody responses, making it an important focus in vaccine development. Researchers can use this relationship to study how vaccine-related immune responses recognize influenza viruses and how antigenic variation may affect that recognition. The resulting work connects molecular features of the virus with vaccine-focused investigations.
Ha protein is used in diagnostic assays as a measurable viral component relevant to influenza research. Its association with host-cell recognition and antibody responses gives investigators a way to examine biologically important features of the virus. This application complements mechanistic studies by supporting experimental analysis beyond the infection process itself.
Researchers examine Ha protein because its receptor interactions and antigenic changes are linked to important influenza behaviors. Studies can investigate how mutations alter host range, transmission, or immune escape, while also considering the protein’s role in viral entry. This makes it a useful molecular focus for connecting viral variation with broader infection outcomes.