GO:0101031 protein folding chaperone complex: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0101031 (protein folding chaperone complex) defines a protein complex required for non-covalent folding, unfolding, maturation, stabilization, assembly or disassembly of macromolecular structures, often acting during or immediately after translation.
• Major chaperone complexes include the Hsp70 system, Hsp90 system, chaperonin CCT/TRiC, and intramembrane chaperone complexes such as the PAT complex.
• These complexes maintain proteostasis by preventing aggregation, assisting folding, and facilitating client maturation.
• Dysfunction of chaperone complexes is linked to cancer, neurodegeneration, and other protein-misfolding diseases.
• Key genes include HSPA1A, HSP90AA1, CCT1, and others that form the core of these complexes.
• Research methods such as NMR, cryo-EM, and CRISPR screening are essential to dissect chaperone complex functions.
Description
The Gene Ontology (GO) term GO:0101031, protein folding chaperone complex, describes a cellular component comprising a protein complex that is required for the non-covalent folding or unfolding, maturation, stabilization, assembly, or disassembly of macromolecular structures. These complexes typically act during or immediately after translation and often contain heat shock proteins. Understanding chaperone complexes is fundamental to cell biology because they ensure proper protein folding and maintain proteostasis, preventing the accumulation of misfolded proteins that can lead to disease. Researchers study these complexes to elucidate mechanisms of protein folding, to identify therapeutic targets for diseases such as cancer and neurodegeneration, and to engineer cells with altered chaperone capacity. This article provides a comprehensive overview of the protein folding chaperone complex, covering its definition, structure, molecular mechanisms, key genes, disease relevance, and research methodologies, with a focus on CRISPR-based models and services offered by EDITGENE.
protein folding chaperone complex At A Glance
| GO ID | GO:0101031 |
|---|---|
| GO term | protein folding chaperone complex |
| Ontology | cellular_component |
| Synonym | chaperone complex |
| Major function | Assists non-covalent folding, unfolding, maturation, stabilization, assembly, or disassembly of macromolecular structures |
| Cellular location | Cytosol, endoplasmic reticulum, mitochondria, and other compartments |
| Typical components | Heat shock proteins (e.g., Hsp70, Hsp90), chaperonins (e.g., CCT/TRiC), co-chaperones |
| Associated processes | Protein folding, proteostasis, stress response |
What Is GO:0101031?
GO:0101031, protein folding chaperone complex, is defined as a protein complex that is required for the non-covalent folding or unfolding, maturation, stabilization, assembly, or disassembly of macromolecular structures. It is usually active during or immediately after the completion of translation. Many chaperone complexes contain heat shock proteins. This definition is based on the QuickGO authoritative data.
Why Is protein folding chaperone complex Important in Cell Biology?
Protein folding chaperone complexes are essential for maintaining cellular proteostasis by ensuring that proteins attain their correct three-dimensional structures and by preventing the accumulation of toxic aggregates. They are involved in a wide range of cellular processes, including signal transduction, cell cycle regulation, and immune response. Dysregulation of chaperone complexes is implicated in numerous human diseases, including cancer, neurodegenerative disorders, and metabolic diseases. Therefore, studying these complexes is critical for understanding basic biology and for developing novel therapeutic strategies.
• Maintains proteostasis by assisting protein folding and preventing aggregation.
• Plays a key role in the cellular stress response, particularly the heat shock response.
• Involved in the maturation of signaling proteins, such as steroid hormone receptors and kinases.
• Dysfunction is linked to cancer, where chaperones support oncogenic protein folding.
• Implicated in neurodegenerative diseases like Alzheimer's and Parkinson's due to protein misfolding.
• Targeted by drugs such as Hsp90 inhibitors in clinical trials for cancer.
• Essential for the biogenesis of membrane proteins via intramembrane chaperone complexes.
• Required for the folding of cytoskeletal proteins like actin and tubulin by CCT/TRiC.
• Studied using advanced techniques like NMR and cryo-EM to visualize folding trajectories.
• Can be engineered using CRISPR to create knockout or knock-in models for research.
Core Biology of protein folding chaperone complex
What Happens During protein folding chaperone complex?
In simple terms: Chaperone complexes help newly made proteins fold correctly and prevent them from clumping together.
Protein folding chaperone complexes assist in the non-covalent folding, unfolding, maturation, stabilization, assembly, or disassembly of macromolecular structures. They typically act during or immediately after translation to ensure proper protein conformation. The process begins with the recognition of exposed hydrophobic patches on nascent polypeptides by chaperones such as Hsp70, which binds to these regions and prevents aggregation. Subsequently, the client protein may be transferred to other chaperones like Hsp90 or the chaperonin CCT/TRiC for further folding. This sequential action facilitates the attainment of the native state, often coupled with ATP hydrolysis. If folding is unsuccessful, the protein may be targeted for degradation.
Structure and Composition of protein folding chaperone complex
In simple terms: These complexes are made of multiple proteins that work together like a machine to fold other proteins.
Protein folding chaperone complexes are composed of various proteins, including heat shock proteins and co-chaperones. For example, the Hsp70 system consists of Hsp70 (HSPA1A) and its co-chaperone Hsp40 (DNAJ), which together bind and fold client proteins. The Hsp90 system includes Hsp90 (HSP90AA1) and co-chaperones such as Hop (STIP1) and p23 (PTGES3), forming a dynamic complex that matures client proteins like steroid hormone receptors. The chaperonin CCT/TRiC is a large barrel-shaped complex composed of eight different subunits (CCT1-8) that provides an isolated environment for folding actin and tubulin. Intramembrane chaperone complexes, such as the PAT complex (composed of PAT-3 and PAT-10), facilitate the folding of membrane proteins within the lipid bilayer. These complexes often undergo conformational changes driven by ATP binding and hydrolysis.
Molecular Mechanism of protein folding chaperone complex
In simple terms: Chaperones use energy from ATP to grab onto proteins and help them fold into the right shape.
The molecular mechanism of chaperone complexes involves ATP-dependent cycles of client binding and release. Hsp70, for instance, binds to hydrophobic segments of unfolded proteins in its ATP-bound state, and upon ATP hydrolysis, it locks onto the substrate, facilitating folding. Hsp90 acts downstream, using ATP to drive conformational changes that mature client proteins, often in collaboration with Hsp70 and Hop. The chaperonin CCT/TRiC encapsulates client proteins in a central cavity, where folding occurs in an ATP-dependent manner. Intramembrane chaperones like the PAT complex assist in the folding of transmembrane domains within the membrane. These mechanisms are regulated by co-chaperones and post-translational modifications, ensuring proper proteostasis.
Regulation of protein folding chaperone complex
In simple terms: The activity of chaperone complexes is controlled by cellular signals and stress conditions.
The expression and activity of protein folding chaperone complexes are regulated at multiple levels. Heat shock transcription factor 1 (HSF1) induces the expression of heat shock proteins in response to stress, thereby increasing chaperone complex availability. Co-chaperones such as Hop and p23 modulate the ATPase activity and client specificity of Hsp90. Post-translational modifications, including phosphorylation and acetylation, can affect chaperone function. Additionally, the unfolded protein response (UPR) in the endoplasmic reticulum regulates the expression of ER chaperones like BiP (HSPA5). These regulatory mechanisms ensure that chaperone complexes are active when needed to maintain proteostasis.
Key Genes Involved in GO:0101031 protein folding chaperone complex
The following genes encode key components of protein folding chaperone complexes, including heat shock proteins, chaperonins, and co-chaperones.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSPA1A | Hsp70 family chaperone; binds unfolded proteins | Central to stress response and proteostasis |
| HSP90AA1 | Hsp90 family chaperone; matures client proteins | Target in cancer therapy |
| HSPA5 | ER chaperone BiP; involved in UPR | Studied in ER stress and membrane protein folding |
| CCT1 (TCP1) | Subunit of CCT/TRiC chaperonin | Required for actin and tubulin folding |
| CCT2 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT3 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT4 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT5 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT6A | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT7 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| CCT8 | Subunit of CCT/TRiC chaperonin | Component of chaperonin complex |
| DNAJA1 | Hsp40 co-chaperone; stimulates Hsp70 ATPase | Regulates Hsp70 function |
| DNAJB1 | Hsp40 co-chaperone; binds unfolded proteins | Involved in protein quality control |
| STIP1 | Hop co-chaperone; links Hsp70 and Hsp90 | Essential for Hsp90 client loading |
| PTGES3 | p23 co-chaperone; stabilizes Hsp90 complexes | Modulates Hsp90 activity |
| PAT-3 | Component of intramembrane chaperone complex | Facilitates membrane protein biogenesis |
| PAT-10 | Component of intramembrane chaperone complex | Facilitates membrane protein biogenesis |
How Is protein folding chaperone complex Regulated?
The activity of protein folding chaperone complexes is regulated by various mechanisms, including transcriptional induction via heat shock factor 1 (HSF1), co-chaperone interactions, and post-translational modifications. Additionally, the unfolded protein response (UPR) regulates ER chaperones. These regulatory pathways ensure that chaperone complexes respond to cellular stress and maintain proteostasis.
protein folding chaperone complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSP90AA1 | Cancer; supports oncogenic protein folding | Knockout or point mutation in cancer cell lines |
| HSPA1A | Neurodegeneration; prevents protein aggregation | Knock-in of disease-associated mutations in neurons |
| CCT1 | Cancer; required for cytoskeletal protein folding | Knockout in tumor models |
| PAT-3 | Membrane protein biogenesis disorders | Knockout in C. elegans or mammalian cells |
| STIP1 | Cancer; Hsp90 client loading | Overexpression or knockout in cancer cells |
Cancer
Protein folding chaperone complexes are often upregulated in cancer cells to support the folding of oncogenic proteins and to maintain proteostasis under stress. Hsp90 inhibitors, such as geldanamycin derivatives, have been developed as anticancer agents and are in clinical trials. Targeting chaperone complexes is a promising therapeutic strategy for various cancers.
Neurodegenerative Diseases
Misfolding and aggregation of proteins are hallmarks of neurodegenerative diseases such as Alzheimer's and Parkinson's. Chaperone complexes, including Hsp70 and Hsp90 systems, are involved in preventing aggregation and promoting clearance of misfolded proteins. Dysfunction of these complexes can exacerbate disease progression.
Membrane Protein Biogenesis Disorders
Intramembrane chaperone complexes, such as the PAT complex, are essential for the folding of membrane proteins. Defects in these complexes can lead to diseases associated with membrane protein misfolding, although specific disorders are still being elucidated.
From protein folding chaperone complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of Hsp70 in protein folding? | Knockout of HSPA1A in cell lines |
| How do point mutations in Hsp90 affect client maturation? | Point mutation knock-in of HSP90AA1 |
| What is the effect of CCT/TRiC overexpression? | Overexpression of CCT subunits in cells |
| How does the PAT complex facilitate membrane protein folding? | Tagged knock-in of PAT-3 for imaging |
| What are the interactors of Hsp90? | Knock-in of epitope-tagged HSP90AA1 for proteomics |
| Can CRISPR screening identify novel chaperone regulators? | Genome-wide CRISPR knockout library screening |
How to Study the protein folding chaperone complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NMR spectroscopy | Protein structure and dynamics | Studying folding trajectories |
| Cryo-EM | High-resolution structures of complexes | Determining chaperone complex architecture |
| ATPase assay | ATP hydrolysis rate | Measuring chaperone activity |
| RNA-seq | Gene expression profiles | Analyzing chaperone gene regulation |
| Proteomics | Protein interactions and abundance | Identifying client proteins and interactors |
| CRISPR screening | Gene function on a genome-wide scale | Discovering novel chaperone regulators |
| Fluorescence microscopy | Localization and dynamics | Visualizing chaperone complexes in cells |
Structural Biology Methods
Techniques such as NMR and cryo-EM are used to determine the structures of chaperone complexes and visualize their conformational changes during client folding. For example, NMR has been used to study the folding trajectory of the G protein β5 β-propeller mediated by CCT/TRiC.
Biochemical Assays
ATPase assays, client binding assays, and folding assays are commonly used to measure chaperone activity. These methods help quantify the efficiency of chaperone-mediated folding and the effects of mutations.
Genomic and Proteomic Approaches
RNA-seq and proteomics can profile the expression of chaperone genes and identify client proteins. CRISPR screening combined with these methods can uncover novel components and regulators of chaperone complexes.
Imaging Techniques
Fluorescence microscopy and live-cell imaging allow visualization of chaperone localization and dynamics in real time. Tagged knock-in models enable tracking of endogenous chaperones.
How CRISPR Can Be Used to Study GO:0101031 protein folding chaperone complex
Knockout
CRISPR knockout of chaperone genes such as HSPA1A or HSP90AA1 can reveal their essential roles in protein folding and cell viability. Knockout cell lines are valuable for studying loss-of-function phenotypes and for drug target validation.
Point Mutation
Introducing point mutations in chaperone genes using CRISPR can mimic disease-associated variants or disrupt key functional domains, such as ATPase activity. These models help dissect the molecular mechanisms of chaperone function.
Knock-in
Knock-in of tagged chaperones (e.g., GFP or HA) allows for real-time imaging and proteomic analysis of endogenous complexes. This approach is useful for studying chaperone localization and interactions.
Overexpression
CRISPR-mediated overexpression of chaperone genes can model conditions of chaperone stress and investigate their protective effects against protein aggregation. Overexpression models are also used to study chaperone-mediated folding in disease contexts.
How EDITGENE Supports protein folding chaperone complex Research
Researchers studying protein folding chaperone complex-related genes often need to determine whether a candidate gene is causally involved in protein folding, proteostasis, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to create precise cell models for such investigations, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for protein folding chaperone complex research.
Frequently Asked Questions About protein folding chaperone complex
What is GO:0101031 protein folding chaperone complex?
GO:0101031 is a Gene Ontology term for a protein complex required for non-covalent folding, unfolding, maturation, stabilization, assembly, or disassembly of macromolecular structures, often acting during or after translation.
What genes are involved in protein folding chaperone complex?
Key genes include HSPA1A, HSP90AA1, CCT1-8, DNAJA1, DNAJB1, STIP1, PTGES3, and PAT-3, among others.
What is the function of protein folding chaperone complex?
It assists in protein folding, prevents aggregation, and maintains proteostasis by facilitating the maturation of client proteins.
How is protein folding chaperone complex regulated?
It is regulated by heat shock factors, co-chaperones, post-translational modifications, and the unfolded protein response.
What diseases are associated with protein folding chaperone complex?
Dysfunction is linked to cancer, neurodegenerative diseases, and membrane protein biogenesis disorders.
What methods are used to study protein folding chaperone complex?
Common methods include NMR, cryo-EM, ATPase assays, RNA-seq, proteomics, and CRISPR screening.
How can CRISPR be used to study protein folding chaperone complex?
CRISPR can create knockout, point mutation, knock-in, and overexpression models to dissect gene function and disease mechanisms.
What is the role of Hsp70 in protein folding chaperone complex?
Hsp70 binds unfolded proteins and, with co-chaperones, facilitates folding in an ATP-dependent manner.
What is the role of Hsp90 in protein folding chaperone complex?
Hsp90 matures client proteins, often in collaboration with Hsp70 and co-chaperones like Hop.
What is the CCT/TRiC chaperonin?
CCT/TRiC is a barrel-shaped chaperonin complex that folds actin and tubulin in an ATP-dependent manner.
Conclusion
Protein folding chaperone complexes (GO:0101031) are essential cellular machines that ensure proper protein folding and maintain proteostasis. Their dysfunction is implicated in a wide range of diseases, making them important research targets. Advances in structural biology, genomics, and CRISPR-based models continue to unravel their mechanisms and therapeutic potential. EDITGENE provides comprehensive services to support research on these complexes, from gene knockout to library screening.
References
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- 3. Shen PS et al.. 2025. Protein folding by the CCT/TRiC chaperone complex.. Curr Opin Struct Biol 91:102999 PMID: 39914052
- 4. Mayer MP et al.. 2005. Hsp70 chaperones: cellular functions and molecular mechanism.. Cell Mol Life Sci 62(6):670-84 PMID: 15770419
- 5. Wang S et al.. 2023. Visualizing the chaperone-mediated folding trajectory of the G protein β5 β-propeller.. Mol Cell 83(21):3852-3868.e6 PMID: 37852256
- 6. Chitwood PJ et al.. 2020. An intramembrane chaperone complex facilitates membrane protein biogenesis.. Nature 584(7822):630-634 PMID: 32814900
- 7. Wang RY et al.. 2022. Structure of Hsp90-Hsp70-Hop-GR reveals the Hsp90 client-loading mechanism.. Nature 601(7893):460-464 PMID: 34937942
- 8. Zhuravleva A et al.. 2017. Protein folding by NMR.. Prog Nucl Magn Reson Spectrosc 100:52-77 PMID: 28552172
