Protein Refolding Measurement
Protein Refolding Measurement - Related Videos
07:18
Intracellular Refolding Assay
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Cited by 9 •
2012
In this protocol a method to measure intracellular protein refolding after heat shock is described. This method can be used to study foldases like molecular chaperones and their co-factors or compounds able to influence their activity. Firefly luciferase activity is used as reporter to measure chaperone refolding activity.
13:52
Coupled Assays for Monitoring Protein Refolding in Saccharomyces cerevisiae
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Cited by 14 •
2013
This article describes the use of a firefly luciferase-GFP fusion protein to investigate in vivo protein folding in Saccharomyces cerevisiae. Using this reagent, refolding of a model heat-denatured protein can be monitored simultaneously by fluorescence microscopy and an enzymatic assay to probe the roles of proteostasis network components in protein quality control.
09:43
Purification and Refolding to Amyloid Fibrils of (His)6-tagged Recombinant Shadoo Protein Expressed as Inclusion Bodies in E. coli
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Cited by 3 •
2015
A two-step chromatographic method is described for the purification of recombinant Shadoo protein expressed as inclusion bodies in Escherichia coli, as well as a protocol to fibrillate purified Shadoo into amyloid structures.
06:17
Measuring Protein Binding to F-actin by Co-sedimentation
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Cited by 18 •
2017
This protocol describes a method to test the ability of a protein to co-sediment with filamentous actin (F-actin) and, if binding is observed, to measure the affinity of the interaction.
08:38
Protein Membrane Overlay Assay: A Protocol to Test Interaction Between Soluble and Insoluble Proteins in vitro
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Cited by 6 •
2011
Testing protein-protein interaction is indispensable for dissection of protein functionality. Here, we introduce an in vitro protein-protein binding assay to probe a membrane-immobilized protein with a soluble protein. This assay provides a reliable method to test interaction between an insoluble protein and a protein in solution.
FAQs
Time-resolved measurements show how rapidly structural or functional signals change after refolding begins. The resulting patterns can distinguish rapid recovery from slower transitions and may expose folding intermediates that appear during the process. They can also reveal aggregation, making the experiment useful for understanding the pathway and not merely whether the protein eventually regains its native state.
Controlled denaturation establishes a reproducible starting state, while removing or diluting the denaturant initiates refolding under defined conditions. Consistent handling allows researchers to compare recovery rates and outcomes between experiments. If these conditions vary, differences in fluorescence, circular dichroism, absorbance, or enzymatic activity may reflect the experimental setup rather than genuine changes in protein behavior.
Fluorescence, circular dichroism, and absorbance provide measurements of changing protein structure during recovery, whereas enzymatic activity indicates whether functional performance returns. Comparing these signals can show whether structural changes coincide with restored function. This distinction is valuable because a protein may display structural recovery while the measured functional activity provides a separate outcome to evaluate.
A typical workflow begins by denaturing the protein under controlled conditions. Refolding then starts when the denaturant is removed or diluted, followed by measurements collected over time. Researchers monitor fluorescence, circular dichroism, absorbance, or enzymatic activity to follow recovery. The resulting time-dependent data can be examined for refolding behavior, intermediates, aggregation, and functional return.
The same denaturation and refolding measurements can be applied to different protein variants or to reactions with and without chaperone effects. Comparing the resulting structural or activity signals helps identify differences in stability, refolding kinetics, or recovery. This makes the approach useful for determining how sequence variation or chaperone involvement influences protein behavior.
Researchers can apply refolding measurements when optimizing purification or bioprocessing conditions, where recovery of stable and functional protein is important. The approach also supports molecular biology studies of protein stability and provides context for investigating protein-misfolding diseases. By tracking structural recovery, activity, intermediates, and aggregation, experiments connect measurable behavior with broader biological and biotechnology questions.