Fluorescent Polyq Proteins
Fluorescent Polyq Proteins - Related Videos
05:36
Fluorescence Lifetime Imaging of PolyQ Protein Aggregation in Caenorhabditis elegans Neurons
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2025
Source: Pigazzini, M. L., et. al. Characterization of Amyloid Structures in Aging C. Elegans Using Fluorescence Lifetime Imaging. J. Vis. Exp. (2020).This video demonstrates the use of fluorescence lifetime imaging microscopy (FLIM) to assess polyQ protein aggregation in C. elegans neurons, comparing control and chaperone protein-deficient worms. Increased aggregation in chaperone-deficient worms promotes energy transfer between clustered fluorophores, reducing fluorescence lifetime.
04:06
An Assay to Study Effect of Test Compound against PolyQ-Mediated Neurotoxicity in Worms
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2025
In this video, we describe a method to evaluate the neuroprotective effect of a test compound, astragalan, on neuronal survival in Caenorhabditis elegans from polyQ-mediated neurotoxicity. The assay uses Caenorhabditis elegans expressing the abnormally expanded polyQ repeats fused to GFP in their ASH neurons to measure neuronal survival following test compound treatment.
04:32
PolyQ Aggregation Assay to Identify Neuroprotective Effect of a Compound in Worms
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2025
This video describes an in vivo method to screen the protective potential of neuroprotective test compounds in reducing polyQ aggregation in body wall muscle cells of nematodes and ameliorating aggregation-associated proteotoxicity.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
06:26
Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography
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Cited by 2 •
2023
The present protocol describes a procedure to perform fluorescent size exclusion chromatography (FSEC) on membrane proteins to assess their quality for downstream functional and structural analysis. Representative FSEC results collected for several G-protein coupled receptors (GPCRs) under detergent-solubilized and detergent-free conditions are presented.
FAQs
Expansion beyond a disease-associated threshold can destabilize the protein’s conformation, promoting misfolding and self-association. These changes may produce soluble oligomers before larger intracellular aggregates become visible. Tracking this progression helps researchers examine how altered protein states relate to cellular toxicity and distinguish early aggregation behavior from later accumulation.
The fluorescent reporter makes the engineered protein detectable in living cells without relying only on endpoint measurements. Its signal supports visualization of intracellular distribution and quantitative analysis of changes in aggregation-related patterns. This allows investigators to compare polyQ behavior across experimental conditions and assess whether a factor alters accumulation or cellular responses.
Oligomers and aggregates represent different observable outcomes of polyQ self-association and misfolding. Measuring their appearance or abundance can reveal how an expanded tract behaves inside cells and whether aggregation-modifying factors change that behavior. These readouts also provide a way to investigate connections between protein accumulation and toxicity without treating every fluorescent signal as equivalent.
Researchers can examine fluorescent patterns and quantitative measurements under different experimental conditions, then compare the resulting levels or distributions of polyQ-associated accumulation. Such comparisons may show whether cells respond differently to expanded protein states or to aggregation-modifying factors. The approach is therefore useful for linking protein behavior with cellular response rather than observing aggregation in isolation.
A supported workflow includes introducing the engineered fluorescent polyQ construct into a living-cell model, observing its signal by imaging, and quantifying relevant aggregation-associated patterns. Investigators can then compare measurements across conditions, such as the presence or absence of an aggregation-modifying factor. This workflow connects visual observations with numerical analysis of polyQ behavior.
They are useful when a study needs an observable model for testing whether experimental conditions modify polyQ aggregation or related cellular responses. Fluorescence enables researchers to compare candidate effects in living cells and prioritize strategies that reduce unfavorable accumulation or toxicity-associated outcomes. The system supports screening, while subsequent work is needed to interpret therapeutic relevance.
Expanded polyQ proteins provide a controllable experimental context for examining protein misfolding, self-association, aggregation, and cellular toxicity associated with polyglutamine disorders. In Huntington’s disease research, they help investigators compare disease-relevant protein behavior and evaluate aggregation-modifying factors. More broadly, the models connect molecular aggregation processes with cellular changes relevant to neurodegenerative disease studies.