Viral Envelope
Viral Envelope - Related Videos
08:29
Averaging of Viral Envelope Glycoprotein Spikes from Electron Cryotomography Reconstructions using Jsubtomo
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Cited by 21 •
2014
An approach is presented for determining structures of viral membrane glycoprotein complexes using a combination of electron cryo-tomography and sub-tomogram averaging with the computational package Jsubtomo.
01:18
Outer Layers of the Cell Envelope
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2025
The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
07:29
Determination of Molecular Structures of HIV Envelope Glycoproteins using Cryo-Electron Tomography and Automated Sub-tomogram Averaging
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Cited by 16 •
2011
The protocol describes a high-throughput approach to determining structures of membrane proteins using cryo-electron tomography and 3D image processing. It covers the details of specimen preparation, data collection, data processing and interpretation, and concludes with the production of a representative target for the approach, the HIV-1 Envelope glycoprotein. These computational procedures are designed in a way that enables researchers and students to work remotely and contribute to data...
03:56
An In Vitro Recombinant Virus Reporter System for the Detection of Viral Infection
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2025
This video demonstrates an in vitro technique to detect hepatitis B virus (HBV) infection via a recombinant HBV reporter system. Upon infecting host cells, the recombinant viral genome expresses the luciferase reporter enzyme, which produces bioluminescence upon oxidizing its substrate — helping detect viral infection.
02:38
An Assay to Evaluate the Effect of Test Compounds on Viral Entry and Fusion in Host Cells
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2025
This video demonstrates an assay to evaluate antiviral agents that target specific steps of the viral entry into host cells and fusion with the endosome. The cells are incubated at a low temperature and then infected with HCV. The low temperature permits viral binding to host cells but inhibits internalization via endocytosis. The test antiviral compound is added, and the cells are incubated at physiological temperature. This shift to a higher temperature facilitates viral entry and allows...
FAQs
Envelope glycoproteins first recognize and bind specific receptors on a host-cell surface. This interaction can initiate membrane fusion, allowing the viral envelope to merge with the cell membrane and release the viral genome into the cell. Because receptor binding and fusion depend on molecular compatibility, these proteins strongly influence which cells a virus can enter.
The lipid and protein composition of an envelope affects how well the virus remains intact outside a host cell. Differences in composition can alter environmental sensitivity, transmission potential, and susceptibility to detergents or disinfectants. Consequently, envelope stability helps determine how readily viral particles persist long enough to reach susceptible cells.
During budding, a virus typically acquires its envelope from a host-cell membrane, while inserting viral glycoproteins into that membrane. This host-derived component can influence how the particle interacts with the immune system, whereas the viral glycoproteins provide specific molecular features for receptor binding, fusion, and immune recognition.
Studies of entry commonly focus on the envelope glycoproteins, their ability to bind cell-surface receptors, and the resulting membrane-fusion step. Researchers can also consider envelope stability because a particle must retain functional surface components during transmission. These features connect molecular interactions with genome release and determine how entry contributes to viral spread.
Envelope glycoproteins provide important targets because they participate directly in receptor binding and membrane fusion. Research can therefore examine these surface components when developing vaccines or antiviral drugs. Envelope stability offers an additional consideration, since disrupting the membrane or altering its integrity may reduce the particle's ability to enter host cells.
Diagnostic assays can use distinctive envelope components, particularly viral glycoproteins, to help detect or characterize viruses. Their receptor-binding and immune-interaction properties provide biologically relevant features for assay design. Understanding envelope composition also helps researchers interpret how changes in the viral surface may affect detection, entry behavior, or interactions with host cells.
Envelope composition and stability help predict how sensitive a virus may be to detergents or disinfectants. This information is relevant when studying viral survival outside cells and designing strategies to limit viral spread. In biology research, the same properties also guide investigation of transmission, assembly, budding, and the conditions that preserve or disrupt infectious particles.