Precursor Unfolding
Precursor 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.
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.
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...
FAQs
Molecular chaperones bind regions exposed when a precursor protein loses or relaxes its folded structure. This binding helps shield the precursor from aggregation while preserving a conformation suitable for transport. By maintaining that translocation-competent state, chaperones connect structural remodeling with delivery through membrane translocases and support the precursor’s later maturation.
A precursor must retain a transport-compatible state so it can pass through a membrane translocase rather than simply collapse into aggregates. Chaperone binding helps preserve this condition during targeting. The requirement links protein structure to localization: successful transport allows import or processing to occur before the molecule acquires its mature functional form.
No. In the targeting context, the structural change can be followed by refolding or acquisition of a functional form after import or processing. This sequence distinguishes a preparatory change in conformation from permanent structural damage. The distinction is important because cells use unfolding to coordinate transport and maturation rather than to eliminate the precursor.
A useful conceptual sequence begins with a newly synthesized precursor, followed by relaxation of its folded structure and chaperone association. Researchers then consider its passage through a membrane translocase, subsequent import or processing, and recovery of a functional form. Examining these linked stages reveals how structural state, transport, and maturation are coordinated.
This topic helps explain intracellular protein trafficking and organelle biogenesis by showing how a precursor’s structural state affects its delivery and maturation. It also contributes to understanding proteostasis, the cellular management of protein structure and quality. Together, these applications connect molecular conformational changes with the organization and maintenance of biological compartments.
The process provides a structural link between where a precursor is located and when it becomes functional. A precursor can undergo the conformational change needed for targeting, pass through a membrane translocase, and then be imported or processed before acquiring its functional form. This relationship helps explain how cells coordinate localization, maturation, and activation.