Protein Unfolding Forces
Protein Unfolding Forces - Related Videos
01:37
The Unfolded Protein Response
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2023
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
06:45
Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Cited by 4 •
2019
We describe the detailed procedures and strategies to measure the mechanical properties and mechanical unfolding pathways of single protein molecules using an atomic force microscope. We also show representative results as a reference for selection and justification of good single protein molecule recordings.
02:38
Assessing Bacterial Chaperone Activity via Thermal Unfolding of a Model Protein
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2025
Source: Dahl, J. et al. Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo. J. Vis. Exp. (2016)This video demonstrates a fluorescence spectrophotometer-based assay to evaluate chaperone activity on a substrate protein under acid and heat stress. It outlines the steps for monitoring substrate unfolding and aggregation through light scattering, comparing conditions with and without the chaperone.
01:31
Regulation of the Unfolded Protein Response
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2023
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
03:25
Recording Neural Activity of Unfolded Hippocampal Tissue Using Penetrating Microelectrode Array
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2025
This video demonstrates the procedure to set up a recording chamber with a penetrating microelectrode array (PMEA) to capture neural signals from an unfolded hippocampus. This method allows us to study the speed and direction of propagation of neural activity within the unfolded hippocampus in vitro.
FAQs
Protein unfolding forces act through different routes, but their common effect is weakening the interactions that maintain the native structure. Thermal energy can disrupt stabilizing contacts, while pH changes, chemical denaturants, and mechanical tension challenge the structure in distinct ways. Comparing these influences helps reveal which conditions most strongly reduce stability in an engineered protein.
Mechanical tension applies a physical challenge to the polypeptide chain rather than relying only on chemical or thermal conditions. As tension weakens the structural network, the chain can expand and expose residues that were previously buried. This perspective is especially relevant when bioengineers design proteins or protein-based materials that must retain performance under mechanical demands.
Hydrogen bonds, ionic interactions, hydrophobic packing, and other stabilizing forces each contribute to the folded state. Unfolding occurs when conditions weaken enough of this network for the chain to expand, rather than because one interaction necessarily fails in isolation. Identifying the affected interactions helps explain differences in stability among engineered proteins and guides efforts to preserve function.
Tracking responses to thermal energy, pH changes, chemical denaturants, or mechanical tension provides evidence about protein stability and structural resilience. A response that includes chain expansion or exposure of buried residues indicates disruption of native packing. These measurements allow bioengineers to compare candidate designs and identify proteins better suited to demanding applications.
Understanding how proteins respond to destabilizing influences helps researchers design more robust enzymes and therapeutic proteins. It also informs the development of protein-based biomaterials by identifying conditions that could compromise structure and performance. Comparing unfolding behavior can therefore guide selection or modification of proteins for engineered biological systems where stability and function must be maintained.
Unfolding can expose residues that are normally buried within the protein, changing the molecular features presented to the surrounding environment. Controlling the conditions that promote this exposure can help researchers address aggregation, a major concern when developing engineered proteins. This knowledge supports strategies for improving the performance and reliability of protein-based systems.