Protein Complex Visualization
Protein Complex Visualization - Related Videos
08:30
Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy
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Cited by 6 •
2011
A tapping mode atomic force microscope (AFM) method for the visualization of plasmid DNA, cytoplasmic proteins, and DNA-protein complexes is described. The method includes alternate approaches for preparing samples for AFM imaging following biochemical manipulation. DNA containing specific protein interacting regions are observed in near-physiologic buffer conditions.
02:41
Protein Complex Assembly
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2020
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes. Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:57
Protein Complexes with Interchangeable Parts
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2020
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct. The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
08:01
Visualizing Proteins and Macromolecular Complexes by Negative Stain EM: from Grid Preparation to Image Acquisition
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Cited by 137 •
2011
Visualizing protein samples by negative stain electron microscopy (EM) has become a popular structural analysis method. It is useful for quantitative structural analysis, such as calculating a 3D reconstruction of the molecules being studied, and also for qualitative examination of the quality of protein preparations. In this article we present detailed protocols for preparing the EM grids, staining the sample and visualizing the sample in an electron microscope. Novice users can follow these...
FAQs
These visual elements separate subunits and emphasize structural relationships that are difficult to inspect in an unlabeled atomic model. Surface rendering highlights the outer shape, while contrasting colors distinguish individual proteins, ligands, or selected regions. Labels then identify relevant structural features, allowing viewers to connect molecular organization with possible functional roles without changing the underlying coordinate data.
Contact interfaces show where subunits approach one another and where molecular interactions may support assembly. Examining these regions can help relate the arrangement of amino acids to complex stability, recognition, or activity. In biochemistry, interface views are especially useful for interpreting how proteins assemble into enzyme systems or signaling complexes and for selecting regions for further interaction studies.
Comparing structural representations can reveal shifts in subunit orientation, local shape, or the position of a binding region. A mutation can then be considered in relation to those structural features, such as a contact site or interface. The resulting model supports a testable hypothesis about altered function, rather than serving as direct proof of the mutation's biochemical effect.
The workflow begins with experimentally determined or computationally predicted atomic coordinates. The coordinates are then represented as an interactive model, with display choices selected to distinguish subunits, ligands, interfaces, and other features of interest. Researchers can adjust surfaces, colors, and labels to focus the view on a structural question, making the resulting representation useful for analysis and communication.
It is useful when researchers need to examine how multiple proteins organize into a functional assembly. Examples supported by the structural view include enzyme assemblies, signaling complexes, and protein–ligand recognition. By exposing spatial relationships, the visualization helps investigators formulate questions about binding, activity, and subunit organization before pursuing mutagenesis, docking, or interaction studies.
A carefully annotated model can guide hypotheses for mutagenesis, docking, and interaction experiments by identifying interfaces, contact sites, and structurally distinctive regions. It also improves communication of complex structural data among researchers because subunits and ligands can be viewed together in three dimensions. In this way, visualization connects structural interpretation with experimental planning and scientific discussion.