Protein Unfolding
Protein Unfolding - 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...
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.
09:48
Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array
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Cited by 2 •
2015
We have developed an in vitro unfolded hippocampus which preserves CA1-CA3 array of neurons. Combined with the penetrating micro-electrode array, neural activity can be monitored in both the longitudinal and transverse orientations. This method provides advantages over hippocampal slice preparations as the propagation in the entire hippocampus can be recorded simultaneously.
FAQs
These conditions weaken the noncovalent forces that stabilize a protein’s folded state. Heat can disrupt hydrogen-bonding patterns, while extreme pH changes ionic interactions. Organic solvents and chemical denaturants can alter the chemical environment surrounding the protein. Comparing these conditions helps chemists determine which interactions contribute most strongly to structural stability and how environmental changes affect protein behavior.
Each interaction contributes differently to maintaining the native structure. Hydrogen bonds help organize local and larger-scale structural features, ionic interactions depend on charged groups, and hydrophobic effects help maintain the protein’s internal arrangement. Weakening several interactions at once can produce larger structural changes, which may explain simultaneous losses in activity, solubility, or normal molecular interactions.
Disulfide linkages are distinct because they can contribute a stronger covalent connection within a protein structure, whereas hydrogen bonds, ionic interactions, and hydrophobic effects are noncovalent. The overview indicates that unfolding conditions may sometimes affect disulfide linkages as well. Considering both types of stabilization gives a more complete chemical picture of why proteins differ in resistance to structural disruption.
Useful outcomes include changes in biological activity, solubility, and molecular interactions. These measurements connect a structural transition with observable chemical or functional consequences rather than treating unfolding as only a shape change. In chemistry research, comparing such outcomes under different conditions can reveal how strongly a protein depends on its native structure for remaining active, soluble, and properly interactive.
Unfolding measurements show how environmental conditions influence the structural state associated with useful protein function. For enzymes, this supports analysis of how structural disruption relates to altered activity. In protein formulation, the same information helps researchers study conditions that preserve stability or support the retention of biologically useful properties, making measurements relevant to both mechanistic chemistry and practical preparation.
Food processing can expose proteins to conditions that alter their structure, solubility, and interactions, so unfolding measurements help characterize those changes. In disease-related aggregation research, examining structural disruption can clarify how altered proteins behave and interact. The topic therefore connects fundamental chemical stability with applied questions about processed materials and proteins associated with disease.