GO:0016272 prefoldin complex: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016272 (prefoldin complex) is a multisubunit chaperone that delivers unfolded proteins to cytosolic chaperonin and acts as its cofactor.
• In humans, the complex is a heterohexamer of two PFD-alpha and four PFD-beta type subunits.
• In Saccharomyces cerevisiae, prefoldin also acts in the nucleus to regulate RNA polymerase II elongation via histone dynamics.
• Prefoldin subunits are implicated in cancer, including hepatocellular carcinoma and medulloblastoma, and serve as predictive biomarkers.
• The prefoldin complex stabilizes the von Hippel-Lindau protein against aggregation and degradation.
• Prefoldin is a potential target for blocking Plasmodium transmission and is inhibited by rotavirus VP3.
Description
The prefoldin complex (GO:0016272) is a multisubunit chaperone that delivers unfolded proteins to cytosolic chaperonin, acting as a cofactor for the chaperonin folding machinery. It is conserved across eukaryotes and archaea and is essential for the proper folding of actin and tubulin, among other substrates. In humans, the complex is a heterohexamer composed of two PFD-alpha and four PFD-beta type subunits, while in Saccharomyces cerevisiae it also functions in the nucleus to regulate RNA polymerase II elongation through effects on histone dynamics. Researchers study the prefoldin complex because it sits at the intersection of protein homeostasis, cytoskeletal regulation, and gene expression, with emerging roles in cancer, viral infection, and parasite transmission.
prefoldin complex At A Glance
| GO ID | GO:0016272 |
|---|---|
| GO term | prefoldin complex |
| Ontology | cellular_component |
| Synonym | GIM complex |
| Major function | Multisubunit chaperone that delivers unfolded proteins to cytosolic chaperonin and acts as a cofactor |
| Subunit composition (human) | Heterohexamer of two PFD-alpha and four PFD-beta type subunits |
| Nuclear role (S. cerevisiae) | Regulates RNA polymerase II elongation via histone dynamics |
| Related complex | PAQosome, an R2TP- and URI1 prefoldin-based chaperone complex |
What Is GO:0016272?
The prefoldin complex is a multisubunit chaperone that captures unfolded proteins and delivers them to cytosolic chaperonin, functioning as a cofactor for chaperonin-mediated folding. In humans, it is a heterohexamer of two PFD-alpha and four PFD-beta type subunits. In Saccharomyces cerevisiae, it additionally acts in the nucleus to regulate the rate of RNA polymerase II elongation via a direct effect on histone dynamics.
Why Is prefoldin complex Important in Cell Biology?
The prefoldin complex is essential for proteostasis because it captures nascent or stress-unfolded polypeptides and delivers them to cytosolic chaperonin for ATP-dependent folding. Its dysfunction is linked to cancer progression, where prefoldin subunits serve as predictive biomarkers for immunotherapy in hepatocellular carcinoma and support medulloblastoma cell survival through non-canonical open reading frame translation. The complex also stabilizes the von Hippel-Lindau tumor suppressor against aggregation and degradation, and it participates in host-pathogen interactions, including interferon-stimulated gene expression that is inhibited by rotavirus VP3 and Plasmodium transmission in mosquitoes. These diverse roles make the prefoldin complex a high-value target for both mechanistic studies and therapeutic development.
• Delivers unfolded proteins to cytosolic chaperonin as an essential cofactor.
• Maintains proteostasis of cytoskeletal proteins such as actin and tubulin.
• Stabilizes the von Hippel-Lindau protein against aggregation and degradation.
• Serves as predictive biomarkers for hepatocellular carcinoma immunotherapy.
• Supports cancer cell survival in childhood medulloblastoma via non-canonical ORF translation.
• Regulates RNA polymerase II elongation in the yeast nucleus through histone dynamics.
• Is inhibited by rotavirus VP3, linking it to interferon-stimulated gene expression.
• Is a target for blocking Plasmodium transmission in mosquitoes.
• Forms the PAQosome with R2TP and URI1, expanding its chaperone network.
• Yeast Bud27 provides a model for prefoldin subunit-specific functions.
Structure and Composition of prefoldin complex
Submit composition and heterohexameric assembly
In simple terms: The prefoldin complex is built from six subunits that fit together like a molecular basket.
In humans, the prefoldin complex is a heterohexamer of two PFD-alpha and four PFD-beta type subunits. This arrangement creates a jellyfish-like structure with a central cavity that captures unfolded proteins for delivery to chaperonin. The complex is conserved across eukaryotes and archaea, and its subunit composition is critical for substrate recognition and chaperone function.
Interaction with cytosolic chaperonin
In simple terms: Prefoldin hands off unfolded proteins to a larger folding machine called chaperonin.
The prefoldin complex acts as a cofactor for cytosolic chaperonin, delivering unfolded proteins to the chaperonin for ATP-dependent folding. This handoff is essential for the folding of actin and tubulin, which require chaperonin for proper maturation. The interaction between prefoldin and chaperonin is conserved and represents a central node in the cytosolic protein folding pathway.
Nuclear role in RNA polymerase II elongation
In simple terms: In yeast, prefoldin also works in the nucleus to control how fast genes are transcribed.
In Saccharomyces cerevisiae, the prefoldin complex acts in the nucleus to regulate the rate of elongation by RNA polymerase II via a direct effect on histone dynamics. This nuclear function is distinct from its cytosolic chaperone role and highlights the multifunctionality of prefoldin subunits. The yeast prefoldin subunit Bud27 has been specifically implicated in these nuclear functions.
PAQosome and prefoldin-like complexes
In simple terms: Prefoldin is part of a larger chaperone network called the PAQosome.
The PAQosome is an R2TP- and URI1 prefoldin-based chaperone complex that shares subunits with the prefoldin complex and participates in the assembly of various macromolecular machines. This broader network expands the functional repertoire of prefoldin subunits beyond cytosolic protein folding. The PAQosome illustrates how prefoldin-based complexes are integrated into multiple cellular assembly pathways.
Key Genes Involved in GO:0016272 prefoldin complex
The prefoldin complex comprises multiple PFD subunits and associated proteins that together mediate chaperone and nuclear functions.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PFDN1 | Prefoldin subunit, PFD-beta type | Component of the heterohexameric prefoldin complex |
| PFDN2 | Prefoldin subunit, PFD-beta type | Component of the heterohexameric prefoldin complex |
| PFDN3 | Prefoldin subunit, PFD-beta type | Component of the heterohexameric prefoldin complex |
| PFDN4 | Prefoldin subunit, PFD-beta type | Component of the heterohexameric prefoldin complex |
| PFDN5 | Prefoldin subunit, PFD-alpha type | Component of the heterohexameric prefoldin complex |
| PFDN6 | Prefoldin subunit, PFD-alpha type | Component of the heterohexameric prefoldin complex |
| VHL | Von Hippel-Lindau tumor suppressor | Stabilized by prefoldin against aggregation and degradation |
| URI1 | Prefoldin-like complex subunit | Part of the PAQosome with R2TP and prefoldin |
| R2TP | Chaperone complex | Interacts with prefoldin in the PAQosome |
| BUD27 | Yeast prefoldin subunit | Regulates nuclear functions in S. cerevisiae |
| PFDN (Plasmodium) | Prefoldin subunit in mosquito | Target for blocking Plasmodium transmission |
| PFDN (medulloblastoma) | Prefoldin subunit in cancer | Supports non-canonical ORF translation in medulloblastoma |
| PFDN (HCC) | Prefoldin subunit in liver cancer | Predictive biomarker for hepatocellular carcinoma immunotherapy |
| VP3 (rotavirus) | Viral protein | Inhibits prefoldin complex and interferon-stimulated gene expression |
| PFDN (interferon) | Prefoldin subunit in antiviral response | Promotes interferon-stimulated gene expression |
| PFDN (chaperonin) | Prefoldin subunit in folding | Delivers unfolded proteins to cytosolic chaperonin |
| PFDN (histone) | Prefoldin subunit in nucleus | Regulates RNA polymerase II elongation via histone dynamics |
How Is prefoldin complex Regulated?
The prefoldin complex is regulated at multiple levels. In antiviral responses, the complex promotes interferon-stimulated gene expression and is inhibited by rotavirus VP3. In cancer, prefoldin subunit expression is associated with immunotherapy response in hepatocellular carcinoma. The yeast prefoldin subunit Bud27 regulates nuclear functions, including RNA polymerase II elongation. The PAQosome integrates prefoldin with R2TP and URI1 to coordinate assembly of macromolecular complexes.
prefoldin complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PFDN subunits | Hepatocellular carcinoma immunotherapy response | Knockout in HCC cell lines followed by immune checkpoint blockade assays |
| PFDN subunits | Medulloblastoma survival via non-canonical ORF translation | Knockout in medulloblastoma cell lines with Ribo-seq |
| VHL | Von Hippel-Lindau disease and tumorigenesis | Knock-in of VHL mutations with prefoldin overexpression |
| PFDN subunits | Rotavirus infection and interferon response | Knockout in intestinal epithelial cells with rotavirus VP3 expression |
| PFDN subunits | Plasmodium transmission in mosquitoes | Knockout in mosquito cells followed by infection assays |
Prefoldin complex in hepatocellular carcinoma
Prefoldin and prefoldin-like complex subunits serve as predictive biomarkers for hepatocellular carcinoma immunotherapy. Their expression levels correlate with patient response to immune checkpoint blockade, suggesting that prefoldin subunits could guide treatment stratification. This positions the prefoldin complex as a potential therapeutic target in liver cancer.
Prefoldin complex in medulloblastoma
In childhood medulloblastoma, translation of non-canonical open reading frames supports cancer cell survival, and prefoldin subunits are implicated in this mechanism. Targeting the prefoldin complex may disrupt the proteostatic network that medulloblastoma cells rely on for survival. This highlights the complex as a candidate for therapeutic intervention in pediatric brain tumors.
Prefoldin complex and von Hippel-Lindau disease
The prefoldin complex stabilizes the von Hippel-Lindau protein against aggregation and degradation. Loss of this stabilization could contribute to VHL-related pathologies, including tumorigenesis. Understanding prefoldin-VHL interactions may inform therapeutic strategies for VHL disease.
Prefoldin complex in infectious disease
The prefoldin complex promotes interferon-stimulated gene expression and is inhibited by rotavirus VP3, linking it to antiviral immunity. In mosquitoes, targeting the prefoldin-chaperonin complex blocks Plasmodium transmission. These findings suggest that prefoldin could be exploited for host-directed antiviral and antiparasitic therapies.
From prefoldin complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of prefoldin subunit X impair chaperonin-mediated folding? | Knockout cell line (e.g., HEK293) with proteomics |
| Does a point mutation in PFDN alter substrate binding? | Point-mutation knock-in cell line with co-immunoprecipitation |
| Does tagging prefoldin subunits affect complex assembly? | Tagged knock-in (e.g., GFP) with live-cell imaging |
| Does overexpression of prefoldin stabilize VHL? | Overexpression cell line with western blot and aggregation assays |
| Does prefoldin regulate interferon-stimulated genes? | Knockout with RNA-seq and viral infection |
| Does prefoldin support medulloblastoma survival? | Knockout with Ribo-seq and cell viability assays |
How to Study the prefoldin complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Affinity purification-mass spectrometry | Protein-protein interactions | Identifying prefoldin subunits and partners |
| Ribo-seq | Translation efficiency and ORF usage | Detecting non-canonical ORF translation in medulloblastoma |
| RNA-seq | Gene expression changes | Profiling interferon-stimulated genes after prefoldin knockout |
| Fluorescence microscopy | Subcellular localization | Visualizing prefoldin nuclear role in yeast |
| Co-immunoprecipitation | Complex assembly | Assessing prefoldin-chaperonin interaction |
| Western blot | Protein stability | Measuring VHL stabilization by prefoldin |
| Cell viability assay | Cell survival | Testing prefoldin knockout in cancer cells |
| Infection assay | Pathogen transmission | Evaluating Plasmodium transmission in mosquitoes |
Proteomics and interactomics
Affinity purification coupled with mass spectrometry can identify prefoldin complex subunits and their interacting partners, including chaperonin and PAQosome components. This approach reveals the composition and dynamics of the complex under different conditions.
Ribo-seq and RNA-seq
Ribo-seq measures translation efficiency and can detect non-canonical open reading frame translation supported by prefoldin in medulloblastoma. RNA-seq profiles interferon-stimulated gene expression in cells with prefoldin knockout or viral infection.
Imaging and localization
Fluorescence microscopy of tagged prefoldin subunits can visualize complex assembly and nuclear localization, particularly in yeast where prefoldin regulates RNA polymerase II elongation. Live-cell imaging can track substrate delivery to chaperonin.
Biochemical folding assays
In vitro folding assays using purified prefoldin and chaperonin can measure the kinetics of substrate transfer and folding. These assays help dissect the cofactor function of prefoldin.
How CRISPR Can Be Used to Study GO:0016272 prefoldin complex
Knockout
CRISPR knockout of prefoldin subunits can reveal their essential roles in protein folding, cytoskeletal integrity, and cell survival. Knockout models are valuable for studying the contribution of individual subunits to complex assembly and function.
Point Mutation
Point mutations in prefoldin subunits can dissect substrate-binding interfaces and subunit interactions without completely abolishing complex formation. Such models help identify residues critical for chaperone activity.
Knock-in
Knock-in of tagged prefoldin subunits (e.g., GFP or HA) enables visualization and purification of the complex from endogenous loci. This approach preserves native regulation and stoichiometry.
Overexpression
Overexpression of prefoldin subunits can test gain-of-function effects, such as stabilization of VHL or enhancement of chaperone capacity. Overexpression models are useful for studying prefoldin in cancer and antiviral responses.
How EDITGENE Supports prefoldin complex Research
Researchers studying prefoldin complex-related genes often need to determine whether a candidate gene is causally involved in chaperone function, disease progression, or therapeutic response. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for prefoldin complex research.
Frequently Asked Questions About prefoldin complex
What is the prefoldin complex?
The prefoldin complex (GO:0016272) is a multisubunit chaperone that delivers unfolded proteins to cytosolic chaperonin and acts as its cofactor.
What genes are involved in the prefoldin complex?
The human prefoldin complex includes PFDN1-PFDN6 subunits, with two PFD-alpha and four PFD-beta type subunits.
What is the function of GO:0016272?
GO:0016272 functions as a chaperone that delivers unfolded proteins to cytosolic chaperonin and, in yeast, regulates RNA polymerase II elongation.
How is the prefoldin complex structured?
In humans, it is a heterohexamer of two PFD-alpha and four PFD-beta type subunits.
What diseases are associated with prefoldin complex dysfunction?
Prefoldin subunits are linked to hepatocellular carcinoma, medulloblastoma, von Hippel-Lindau disease, and infectious diseases.
How can I study the prefoldin complex using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models can be used to dissect prefoldin subunit functions.
What is the role of prefoldin in cancer?
Prefoldin subunits serve as predictive biomarkers for hepatocellular carcinoma immunotherapy and support medulloblastoma survival.
Does prefoldin interact with viruses?
Yes, the prefoldin complex promotes interferon-stimulated gene expression and is inhibited by rotavirus VP3.
What is the PAQosome?
The PAQosome is an R2TP- and URI1 prefoldin-based chaperone complex that shares subunits with prefoldin.
How is prefoldin regulated?
Prefoldin is regulated by viral proteins such as rotavirus VP3 and participates in interferon signaling.
Conclusion
The prefoldin complex (GO:0016272) is a conserved multisubunit chaperone that delivers unfolded proteins to cytosolic chaperonin and also regulates nuclear RNA polymerase II elongation in yeast. Its subunits are implicated in cancer, viral infection, and parasite transmission, making it a compelling target for therapeutic development. CRISPR-based models and multi-omics approaches will continue to illuminate the mechanistic roles of prefoldin in health and disease.
References
- 1. Liang J et al.. 2020. The functions and mechanisms of prefoldin complex and prefoldin-subunits.. Cell Biosci 10:87 PMID: 32699605
- 2. Zhu Y et al.. 2025. Prefoldin complex promotes interferon-stimulated gene expression and is inhibited by rotavirus VP3.. Nat Commun 16(1):8083 PMID: 40883306
- 3. Zhao H et al.. 2022. Prefoldin and prefoldin-like complex subunits as predictive biomarkers for hepatocellular carcinoma immunotherapy.. Pathol Res Pract 232:153808 PMID: 35217267
- 4. Lynham J et al.. 2018. The Multiple Functions of the PAQosome: An R2TP- and URI1 Prefoldin-Based Chaperone Complex.. Adv Exp Med Biol 1106:37-72 PMID: 30484152
- 5. Chesnel F et al.. 2020. The prefoldin complex stabilizes the von Hippel-Lindau protein against aggregation and degradation.. PLoS Genet 16(11):e1009183 PMID: 33137104
- 6. Martínez-Fernández V et al.. 2018. The Yeast Prefoldin Bud27.. Adv Exp Med Biol 1106:109-118 PMID: 30484156
- 7. Dong Y et al.. 2025. Targeting the mosquito prefoldin-chaperonin complex blocks Plasmodium transmission.. Nat Microbiol 10(4):841-854 PMID: 40050397
- 8. Hofman DA et al.. 2024. Translation of non-canonical open reading frames as a cancer cell survival mechanism in childhood medulloblastoma.. Mol Cell 84(2):261-276.e18 PMID: 38176414
