GO:1904592 positive regulation of protein refolding: Protein Homeostasis Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1904592 (positive regulation of protein refolding) describes any process that activates or increases the frequency, rate or extent of protein refolding, a critical arm of proteostasis.
• Protein refolding is assisted by molecular chaperones and disaggregases that rescue misfolded or aggregated proteins, and its positive regulation is essential for cellular survival under stress.
• Key regulators include heat shock proteins (HSPs), chaperonins, and ATP-dependent disaggregases such as CLPB, which can ameliorate disease pathology in models of neurodegeneration.
• Dysregulation of protein refolding is linked to cancer, neurodegeneration, and metabolic disorders, making this process a therapeutic target.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal interrogation of genes that positively regulate protein refolding.
• High-throughput methods such as Ribo-seq, proteomics, and imaging are used to quantify refolding capacity and identify regulators.
Description
Protein homeostasis (proteostasis) relies on the efficient refolding of misfolded or stress-denatured polypeptides to maintain functional proteomes. The Gene Ontology term GO:1904592, positive regulation of protein refolding, encompasses any process that activates or increases the frequency, rate or extent of protein refolding. This process is fundamental to cellular resilience against environmental insults, including heat shock, oxidative stress, and pathological aggregation. Understanding its regulation is crucial for deciphering mechanisms of diseases such as cancer and neurodegeneration, where protein misfolding plays a central role. Researchers investigate positive regulation of protein refolding to identify therapeutic targets and to engineer cells with enhanced stress tolerance. The term is distinct from protein refolding itself (GO:0042026) and from chaperone-mediated protein folding, as it specifically refers to the upregulation or activation of refolding activities.
positive regulation of protein refolding At A Glance
| GO ID | GO:1904592 |
|---|---|
| GO term | positive regulation of protein refolding |
| Ontology | biological_process |
| Synonym | activation of heat shock protein activity; activation of protein refolding; positive regulation of heat shock protein activity; up regulation of heat shock protein activity; up-regulation of heat shock protein activity; upregulation of heat shock protein activity; up regulation of protein refolding; up-regulation of protein refolding; upregulation of protein refolding |
| Major function | Enhances the refolding of misfolded or denatured proteins, contributing to proteostasis and stress survival. |
| Related processes | Protein refolding (GO:0042026), chaperone-mediated protein folding (GO:0061077), cellular response to heat stress (GO:0034605). |
| Cellular location | Cytoplasm, mitochondria, endoplasmic reticulum (varies by organism and chaperone system). |
| Taxonomic range | Eukaryota, Bacteria, Archaea. |
What Is GO:1904592?
GO:1904592 is defined as any process that activates or increases the frequency, rate or extent of protein refolding. In other words, it covers the regulatory events that boost the cell's ability to refold denatured or misfolded proteins back into their native conformations. This includes the activation of heat shock protein activity and the upregulation of protein refolding machinery.
Why Is positive regulation of protein refolding Important in Cell Biology?
Positive regulation of protein refolding is vital for cellular survival under proteotoxic stress and for preventing the accumulation of toxic protein aggregates. Its dysregulation is implicated in a wide range of human diseases, including cancer, neurodegenerative disorders, and metabolic diseases. Modulating this process offers therapeutic potential, as demonstrated by studies showing that enhancing disaggregase activity can ameliorate Huntington's disease pathology in mice. Furthermore, understanding how cells upregulate refolding capacity can inform strategies for bioproduction of recombinant proteins and for engineering stress-resistant crops.
• Maintains proteostasis by rescuing misfolded proteins from degradation or aggregation.
• Protects cells from heat, oxidative, and other environmental stresses.
• Prevents neurodegeneration by clearing toxic protein aggregates, as shown for CLPB in Huntington's disease models.
• Contributes to cancer cell survival and chemoresistance by buffering proteotoxic stress.
• Enhances recombinant protein production in biotechnology by improving folding yields.
• Plays a role in bacterial thermosensing and adaptation.
• Can be targeted to modulate immune responses and inflammation.
• Involved in plant thermotolerance, with implications for agriculture.
• Provides a mechanism for epigenetic regulation via G-quadruplexes under oxidative stress.
• Offers a pathway for therapeutic intervention in protein-misfolding diseases.
What Happens During positive regulation of protein refolding?
Stress Sensing and Signaling
In simple terms: Cells detect stress and turn on signals to boost refolding.
Upon exposure to stressors such as heat, oxidative stress, or proteotoxic insults, cells activate signaling pathways that lead to the increased expression or activity of chaperones and refolding factors. For example, thermosensors in bacteria trigger heat shock responses, and in eukaryotes, the heat shock transcription factor HSF1 induces HSP expression. Oxidative stress can also modulate epigenetic regulation via G-quadruplexes, influencing the expression of stress-responsive genes.
Chaperone Activation and Upregulation
In simple terms: Chaperone proteins are made more active or more abundant to help refold proteins.
Positive regulation often involves the activation of heat shock proteins (HSPs) such as Hsp70, Hsp40, and chaperonins. These chaperones bind to exposed hydrophobic regions of misfolded proteins and facilitate their refolding in an ATP-dependent manner. The term's synonyms include 'activation of heat shock protein activity', reflecting this core mechanism. In maize, the transcription factor ZmNF-YA1 regulates heat shock response to confer thermotolerance.
Disaggregation and Refolding
In simple terms: Clumped proteins are untangled and refolded into their proper shapes.
When proteins aggregate, disaggregases such as CLPB (caseinolytic peptidase B) can unfold and disentangle them, allowing subsequent refolding by chaperones. Overexpression of neuronal mitochondrial disaggregase CLPB ameliorated Huntington's disease pathology in mice, demonstrating the therapeutic potential of enhancing disaggregation and refolding.
Co-chaperone and Cofactor Interactions
In simple terms: Helper proteins and small molecules assist the refolding process.
Co-chaperones like Hsp40, Hop, and Bag-1 modulate the activity of major chaperones. Additionally, cofactors such as ATP, magnesium, and specific lipids can influence refolding efficiency. For instance, lipid-assisted membrane protein folding and topogenesis highlight the role of membrane environments in refolding. The CARD domain of rat RIP2 kinase undergoes pH-dependent refolding and interacts with protein partners, illustrating how environmental factors regulate refolding.
Integration with Degradation Pathways
In simple terms: If refolding fails, proteins are tagged for destruction.
Positive regulation of refolding is coordinated with protein degradation pathways. When refolding attempts fail, misfolded proteins are targeted for ubiquitin-proteasome or autophagy-lysosome degradation. This balance ensures that toxic species are eliminated. The interplay between refolding and degradation is critical for proteostasis and is often dysregulated in disease.
Key Genes Involved in GO:1904592 positive regulation of protein refolding
The following genes and proteins are key players in the positive regulation of protein refolding, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSPA1A | Hsp70 chaperone; ATP-dependent protein refolding | Core refolding machinery; target for cancer and neurodegeneration |
| HSPA8 | Hsc70; constitutive chaperone involved in refolding and trafficking | Essential for proteostasis; studied in neurodegeneration models |
| DNAJB1 | Hsp40 co-chaperone; stimulates Hsp70 ATPase activity | Regulates refolding specificity; linked to cancer |
| HSPD1 | Hsp60 chaperonin; assists mitochondrial protein folding | Mutations cause hereditary spastic paraplegia |
| CLPB | Mitochondrial disaggregase; unfolds and refolds aggregated proteins | Overexpression ameliorates Huntington's disease in mice |
| HSF1 | Master transcription factor for heat shock response | Upregulates HSPs; target in cancer and proteostasis |
| ZmNF-YA1 | Transcription factor regulating heat shock response in maize | Confers thermotolerance; crop engineering |
| RIP2 | Kinase with CARD domain that undergoes pH-dependent refolding | Involved in immune signaling; refolding studied in vitro |
| IL-2/GM-CSF fusion protein | Recombinant protein requiring refolding for activity | Biotechnological production; refolding methods compared |
| p53 | Tumor suppressor; mutant p53 can be refolded by chaperones | Mutant p53 drives endocrine resistance; refolding may restore function |
| ERα | Estrogen receptor alpha; interacts with mutant p53 | Endocrine resistance in ovarian cancer; refolding interplay |
| G-quadruplex structures | DNA/RNA secondary structures regulating gene expression under oxidative stress | Epigenetic regulation of refolding genes |
| Membrane proteins | Require lipid-assisted folding and topogenesis | Biogenesis and refolding in membranes |
| HSPB1 | Small heat shock protein; holds misfolded proteins for refolding | Cytoprotection; mutations cause neuropathy |
| HSP90 | Chaperone for client protein maturation and refolding | Cancer target; regulates signaling proteins |
| BAG3 | Co-chaperone; facilitates chaperone-assisted selective autophagy | Muscle and neurodegeneration disorders |
| CHIP | E3 ubiquitin ligase; balances refolding and degradation | Quality control; cancer and neurodegeneration |
| VCP/p97 | AAA+ ATPase; extracts misfolded proteins for degradation or refolding | Inclusion body myopathy; neurodegeneration |
How Is positive regulation of protein refolding Regulated?
Positive regulation of protein refolding is tightly controlled at multiple levels. Transcriptional regulation via heat shock factors (e.g., HSF1) increases chaperone gene expression upon stress. Post-translational modifications, such as phosphorylation of chaperones, can modulate their activity. Co-chaperones and nucleotide exchange factors regulate the ATPase cycle of Hsp70, determining refolding efficiency. In bacteria, thermosensors directly sense temperature to activate heat shock genes. Additionally, oxidative stress can influence refolding through epigenetic mechanisms involving G-quadruplexes. The balance between refolding and degradation is regulated by factors like CHIP and BAG3. In plants, transcription factors like ZmNF-YA1 orchestrate heat shock responses for thermotolerance.
positive regulation of protein refolding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CLPB | Huntington's disease; protein aggregation | Knockout and overexpression in neuronal cell lines; mouse models |
| TP53 | Ovarian cancer; endocrine resistance | Point mutation knock-in in cancer cell lines; xenografts |
| HSPA1A | Cancer; neurodegeneration | Knockout and overexpression in HeLa and SH-SY5Y cells |
| RIP2 | Inflammatory signaling | Point mutations in CARD domain; HEK293T cells |
| ZmNF-YA1 | Maize thermotolerance | Knockout and overexpression in maize protoplasts and plants |
Neurodegenerative Diseases
Protein misfolding and aggregation are hallmarks of neurodegenerative disorders such as Huntington's, Alzheimer's, and Parkinson's diseases. Enhancing protein refolding and disaggregation can mitigate pathology. For instance, overexpression of the mitochondrial disaggregase CLPB reduced mutant huntingtin aggregation and improved motor function in a mouse model of Huntington's disease. Similarly, chaperone upregulation has shown protective effects in models of polyglutamine diseases.
Cancer
Cancer cells often rely on enhanced proteostasis to survive proteotoxic stress induced by rapid proliferation and hostile microenvironments. Positive regulation of protein refolding supports oncogenic signaling and chemoresistance. Mutant p53, a common driver in ovarian cancer, binds and controls estrogen receptor activity to promote endocrine resistance, and refolding of mutant p53 by chaperones may restore tumor-suppressive functions. Targeting chaperones like Hsp90 is an active therapeutic strategy.
Metabolic and Inflammatory Disorders
Chronic inflammation and metabolic stress can overwhelm refolding capacity, contributing to diseases such as diabetes and atherosclerosis. The CARD domain of RIP2 kinase undergoes pH-dependent refolding, which affects its interactions and downstream inflammatory signaling. Modulating refolding pathways may offer therapeutic benefits in inflammatory conditions.
Plant Thermotolerance
In crops, positive regulation of protein refolding is critical for heat tolerance. The maize transcription factor ZmNF-YA1 regulates heat shock response genes, enhancing thermotolerance and potentially improving yield under heat stress. Understanding these mechanisms can guide breeding or engineering of climate-resilient crops.
From positive regulation of protein refolding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate protein refolding? | CRISPR knockout and overexpression in HEK293T or HeLa cells, followed by refolding assays |
| What is the effect of a disease-associated point mutation on refolding activity? | CRISPR point mutation knock-in in isogenic cell lines |
| Can a candidate gene rescue protein aggregation in neurodegeneration? | Neuronal overexpression and knockout in SH-SY5Y or primary neurons |
| How does a gene affect thermotolerance in plants? | CRISPR knockout and overexpression in maize or Arabidopsis |
| What is the interactome of a refolding regulator? | Knock-in of epitope tags (e.g., FLAG, HA) followed by immunoprecipitation-mass spectrometry |
| Can enhancing refolding improve recombinant protein yield? | Overexpression of chaperones in CHO or E. coli expression systems |
How to Study the positive regulation of protein refolding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Luciferase refolding assay | Chaperone-mediated refolding activity | Screening for positive regulators of refolding |
| Immunoprecipitation-MS | Protein-protein interactions | Identifying co-chaperones and substrates |
| RNA-seq | Transcriptional changes | Heat shock response gene expression |
| Ribo-seq | Translational efficiency | Global translation of refolding genes |
| Fluorescence microscopy | Protein aggregation and refolding | Neurodegeneration models |
| Western blot | Protein solubility and levels | Detecting misfolded protein clearance |
| ATPase assay | Chaperone ATP hydrolysis | Measuring Hsp70 activity |
| CRISPR screening | Genes affecting refolding | Genome-wide knockout libraries |
Refolding Assays
In vitro refolding assays using denatured model substrates (e.g., luciferase, citrate synthase) are used to measure the activity of chaperones and refolding regulators. These assays can be coupled with ATP regeneration systems and monitored spectrophotometrically or by fluorescence.
Proteomics and Interactomics
Mass spectrometry-based proteomics can identify proteins that co-aggregate or interact with refolding machinery. Immunoprecipitation of tagged chaperones followed by LC-MS/MS reveals dynamic interactomes under stress. For example, the CARD domain of RIP2 was studied using solution structure and protein-protein interaction assays.
Transcriptomics and Ribo-seq
RNA-seq and Ribo-seq measure changes in mRNA expression and translation efficiency of refolding-related genes upon stress or genetic perturbation. This helps identify transcriptional and translational regulators of the refolding response.
Imaging and Aggregation Detection
Fluorescence microscopy with aggregation-sensitive dyes (e.g., Thioflavin T) or fluorescently tagged misfolded proteins (e.g., Htt-polyQ) allows visualization of aggregates and refolding in live cells. High-content imaging can quantify aggregate clearance upon overexpression of disaggregases like CLPB.
How CRISPR Can Be Used to Study GO:1904592 positive regulation of protein refolding
Knockout
CRISPR knockout of candidate genes (e.g., HSPA1A, CLPB) in cell lines such as HEK293T or SH-SY5Y can determine whether they are required for positive regulation of protein refolding. Knockout cells are subjected to stress (e.g., heat shock) and refolding capacity is measured using luciferase or aggregation assays.
Point Mutation
Introducing disease-associated point mutations (e.g., in TP53 or HSPD1) via CRISPR base editing or homology-directed repair allows study of their impact on refolding activity and client protein interactions. Isogenic cell lines provide controlled comparisons.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins (e.g., GFP) at endogenous loci enables real-time tracking of refolding regulators and their interactomes. This is useful for imaging and proteomics.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of genes like CLPB or HSPA1A can enhance refolding capacity and rescue aggregation phenotypes. This approach is used to test therapeutic potential in neurodegeneration models.
How EDITGENE Supports positive regulation of protein refolding Research
Researchers studying positive regulation of protein refolding-related genes often need to determine whether a candidate gene is causally involved in the process or is merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such causal studies, from knockout to precise point mutations and overexpression, along with library screening and bioinformatics support.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of protein refolding research.
Frequently Asked Questions About positive regulation of protein refolding
What is GO:1904592?
GO:1904592 is the Gene Ontology term for 'positive regulation of protein refolding', defined as any process that activates or increases the frequency, rate or extent of protein refolding.
What genes are involved in positive regulation of protein refolding?
Key genes include HSPA1A, HSPA8, DNAJB1, HSPD1, CLPB, HSF1, and ZmNF-YA1, among others.
How is protein refolding regulated?
Protein refolding is regulated by heat shock transcription factors, co-chaperones, ATP levels, and post-translational modifications that modulate chaperone activity.
What diseases are associated with defective protein refolding?
Neurodegenerative diseases (e.g., Huntington's), cancer, and inflammatory disorders are linked to dysregulated protein refolding.
What methods are used to study positive regulation of protein refolding?
Common methods include luciferase refolding assays, immunoprecipitation-mass spectrometry, RNA-seq, Ribo-seq, and fluorescence microscopy.
Can CRISPR be used to study protein refolding?
Yes, CRISPR knockout, point mutation knock-in, and overexpression models are widely used to dissect the causal roles of genes in protein refolding.
What is the role of CLPB in protein refolding?
CLPB is a mitochondrial disaggregase that unfolds and refolds aggregated proteins; its overexpression ameliorates Huntington's disease pathology in mice.
How does heat shock affect protein refolding?
Heat shock induces the expression of heat shock proteins via HSF1, which enhance protein refolding and protect cells from stress.
What is the difference between protein refolding and protein folding?
Protein folding is the initial acquisition of native structure, while protein refolding refers to the rescue of misfolded or denatured proteins back to their native state.
Why is positive regulation of protein refolding important for biotechnology?
Enhancing refolding can improve yields of recombinant proteins and reduce aggregation in bioproduction processes.
Conclusion
Positive regulation of protein refolding (GO:1904592) is a fundamental biological process that safeguards proteostasis and cellular survival under stress. Its dysregulation contributes to major human diseases, and its modulation holds therapeutic promise. CRISPR-based models and advanced omics methods are invaluable for dissecting the underlying mechanisms and identifying new targets. EDITGENE offers comprehensive services to support such research, from gene editing to bioinformatics.
References
- 1. Dowhan W et al.. 2019. Lipid-Assisted Membrane Protein Folding and Topogenesis.. Protein J 38(3):274-288 PMID: 30937648
- 2. Fleming AM et al.. 2021. Oxidative stress-mediated epigenetic regulation by G-quadruplexes.. NAR Cancer 3(3):zcab038 PMID: 34541539
- 3. Shao C et al.. 2026. Mutant p53 binds and controls estrogen receptor activity to drive endocrine resistance in ovarian cancer.. Genes Dev 40(3-4):199-214 PMID: 41193244
- 4. Goncharuk SA et al.. 2018. CARD domain of rat RIP2 kinase: Refolding, solution structure, pH-dependent behavior and protein-protein interactions.. PLoS One 13(10):e0206244 PMID: 30352081
- 5. Wen Q et al.. 2008. Comparison of four methods for the purification and refolding of human interleukin-2-mouse granulocyte/macrophage colony-stimulating factor fusion protein.. Biotechnol Appl Biochem 50(Pt 1):41-8 PMID: 17708750
- 6. Schumann W. 2007. Thermosensors in eubacteria: role and evolution.. J Biosci 32(3):549-57 PMID: 17536174
- 7. Yang Y et al.. 2024. ZmNF-YA1 Contributes to Maize Thermotolerance by Regulating Heat Shock Response.. Int J Mol Sci 25(11) PMID: 38892463
- 8. Kim H et al.. 2026. Neuronal mitochondrial disaggregase CLPB ameliorates Huntington's disease pathology in mice.. Theranostics 16(5):2388-2404 PMID: 41424860
