Helical Capsids
Helical Capsids - Related Videos
12:38
Structure of HIV-1 Capsid Assemblies by Cryo-electron Microscopy and Iterative Helical Real-space Reconstruction
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Cited by 8 •
2011
This article describes a method to obtain a three-dimensional (3D) structure of helically assembled molecules using cryo-electron microscopy. In this protocol, we use HIV-1 capsid assemblies to illustrate the detailed 3D reconstruction procedure for achieving a density map by the iterative helical real-space reconstruction method.
03:24
Visualizing Heat-Treated Viral Capsids Using Transmission Electron Microscopy
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2026
Source: Moore, M. D., et al. Alternative In Vitro Methods for the Determination of Viral Capsid Structural Integrity. J. Vis. Exp.(2017).This video demonstrates how purified viral capsids are heat-treated, prepared, and imaged using transmission electron microscopy (TEM) to reveal structural changes and heat-induced damage.
12:57
Alternative In Vitro Methods for the Determination of Viral Capsid Structural Integrity
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Cited by 6 •
2017
Routine detection methods utilizing viral genome amplification are limited by their inability to discriminate infectious from non-infectious particles. The purpose of this article is to provide detailed protocols for alternative methods to aid in discrimination of infectious norovirus particles using aptamer binding, dynamic light scattering, and transmission electron microscopy.
07:24
In Vitro Disassembly of Influenza A Virus Capsids by Gradient Centrifugation
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Cited by 4 •
2016
Disassembly of influenza A virus cores during virus entry into host cells is a multistep process. We describe an in vitro method to analyze the early stages of viral uncoating. In this approach, velocity gradient centrifugation is used to biochemically dissect the steps that initiate uncoating under defined conditions.
12:24
Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
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Cited by 9 •
2014
We present a combination of Cryo-electron microscopy, lipid nanotechnology, and structure analysis applied to resolve the membrane-bound structure of two highly homologous FVIII forms: human and porcine. The methodology developed in our laboratory to helically organize the two functional recombinant FVIII forms on negatively charged lipid nanotubes (LNT) is described.
FAQs
Repeated contacts between coat proteins and nucleic acid help organize capsid subunits into a continuous spiral arrangement. This interaction is not merely structural: it links the packaged genome to the shell and contributes to the particle’s flexible, elongated form. Because subunits associate repeatedly, the resulting architecture can be examined as a model of viral assembly and stability.
Capsid dimensions can vary with both the viral genome and the number of associated protein subunits. This relationship gives researchers a way to connect molecular composition with particle morphology, rather than treating size as an isolated feature. In biology, that connection supports analysis of how genome packaging relates to assembly and structural stability.
Studying the helical arrangement helps researchers relate capsid organization to two important viral outcomes: stability and host-cell entry. The same structural information also clarifies how repeated protein and nucleic-acid interactions produce an organized particle. This makes helical architecture useful for connecting molecular structure with biological function in viruses.
Microscopy and structural biology methods can investigate the organization of helical capsids and support questions about viral assembly, stability, and host-cell entry. Their relevance extends beyond producing an image: structural observations help researchers interpret how capsid proteins and nucleic acid are arranged within the particle, providing evidence for understanding its organization.
Structural knowledge of helical capsids supports antiviral research by providing a framework for examining viral assembly, stability, and entry. The same understanding can guide virus-like particle design and inform nanotechnology, where repeated protein organization is scientifically useful. These applications connect basic viral biology with efforts to design or study organized biological structures.
Helical capsids occur in viruses that infect plants, animals, and bacteria. This broad distribution makes them relevant to comparative biology because researchers can examine a shared capsid architecture across different host-associated viral systems. Comparing these systems places questions about assembly, genome packaging, stability, and entry within the wider biology of viruses rather than one host group.