Subunit Assembly
Subunit Assembly - Related Videos
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...
06:09
In Vitro Reassociation Assay to Measure the Formation of 80S Ribosomal Particles Using Salt-washed Ribosomal Subunits
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2025
Here, we describe a detailed protocol for the in vitro reassociation of purified, salt-washed eukaryotic ribosomal subunits for the analysis of 80S particle formation. This method is illustrated by analyzing ribosomal subunits isolated from a wild-type strain of Saccharomyces cerevisiae and a mutant strain deficient in the ribosomal protein eL24.
10:01
Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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Cited by 11 •
2017
The architecture of protein complexes is essential for their function. Combining various mass spectrometric techniques proved powerful to study their assembly. We provide protocols for chemical cross-linking and native mass spectrometry and show how these complementary techniques help to elucidate the architecture of multi-subunit protein assemblies.
11:36
Assembly, Loading, and Alignment of an Analytical Ultracentrifuge Sample Cell
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Cited by 21 •
2009
The analytical ultracentrifuge (AUC) sample cell holds sample and reference buffer and during experiments and is exposed to high vacuum and rotor speeds up to 60,000 rpm. This video will demonstrate the rigorous attention to detail necessary for assembly, loading and alignment of this very important component of an AUC experiment.
08:55
Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis
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Cited by 3 •
2016
This article describes a simple and rapid protocol to evaluate the oligomeric state of the dynamin-like GTPase MxA protein from lysates of human cells using a combination of non-denaturing PAGE with western blot analysis.
FAQs
Specific subunits recognize one another through complementary surfaces rather than combining randomly. Hydrophobic regions, electrostatic attractions, and hydrogen bonds help determine which components associate and how they are positioned. These interactions create the structural arrangement needed for coordinated function, so changes that disrupt surface complementarity can prevent a complex from forming correctly or reduce its stability.
Subunit concentration, temperature, pH, and the presence of cofactors can alter assembly outcomes. These variables affect whether interacting components encounter one another, maintain favorable molecular contacts, or preserve the resulting structure. Examining them helps researchers distinguish conditions that support stable, functional complexes from those that favor incomplete assembly, instability, or aggregation.
Correct assembly places individual components in an arrangement that allows them to perform coordinated functions. If subunits associate incorrectly, the resulting complex may lose activity even when its components are present. Faulty assembly can also promote aggregation, making assembly state an important connection between molecular structure, functional performance, and cellular consequences.
Analysis of how components associate shows how biological systems organize separate molecular parts into larger functional structures. This perspective supports research on proteins, enzymes, ribosomes, and viral capsids while connecting molecular interactions with overall complex behavior. It also helps clarify how structural organization enables coordinated activity rather than isolated action by individual components.
When assembly fails, complexes may show impaired activity or a tendency to aggregate. These outcomes provide a framework for investigating how molecular organization becomes disrupted in disease-related processes. By relating altered assembly to changes in structure and function, researchers can study disease mechanisms at the level of molecular interactions rather than considering cellular dysfunction as an isolated event.
Understanding recognition surfaces, stabilizing interactions, and environmental influences gives researchers principles for designing biomolecular systems with chosen structural organizations. Assembly studies can indicate which components need compatible interfaces and which conditions help preserve the resulting complex. This knowledge is relevant when developing engineered systems intended to combine molecular parts into coordinated, functional structures.