GO:0044571 [2Fe-2S] cluster assembly: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0044571 ([2Fe-2S] cluster assembly) describes the biological process by which two iron atoms and two sulfur atoms are incorporated into a [2Fe-2S] iron-sulfur cluster.
• The process is essential for the maturation of numerous iron-sulfur proteins involved in electron transfer, catalysis, and gene regulation.
• Key proteins include the mitochondrial Fe-S cluster assembly complex (NFS1, ISCU, ISD11, FXN), frataxin, ferredoxin-2, and the exporter Atm1p [1,3,4,5].
• Defects in [2Fe-2S] cluster assembly are linked to human diseases such as Friedreich ataxia, cancer, and mitochondrial disorders [1,3].
• Bacterial systems like NifU and Fur illustrate conserved and regulatory roles of [2Fe-2S] clusters [2,8].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are powerful tools to dissect the function of genes involved in [2Fe-2S] cluster assembly [1,3].
Description
Iron-sulfur (Fe-S) clusters are ancient and versatile protein cofactors that participate in electron transfer, substrate binding, catalysis, and regulation of gene expression. Among them, the [2Fe-2S] cluster is one of the most common types, consisting of two iron atoms and two inorganic sulfur atoms. The biological process dedicated to the incorporation of these atoms into target proteins is termed [2Fe-2S] cluster assembly (GO:0044571). This process is highly conserved from bacteria to humans and is essential for the function of many mitochondrial, cytosolic, and nuclear proteins. Research into [2Fe-2S] cluster assembly has revealed a complex machinery involving scaffold proteins, sulfur donors, iron chaperones, and electron transfer chains. In eukaryotes, the mitochondrial Fe-S cluster assembly (ISC) machinery is the primary source of clusters, which are then exported to other compartments [1,4]. In bacteria, specialized systems such as the NIF system assemble clusters for nitrogenase and other proteins. The assembly process is tightly regulated to avoid toxicity from free iron and sulfur [1,2]. Understanding [2Fe-2S] cluster assembly is crucial because defects in this process cause severe human diseases, including Friedreich ataxia, a neurodegenerative disorder caused by reduced frataxin levels [1,3]. Moreover, cancer cells often reprogram iron-sulfur cluster metabolism to support proliferation. This article provides a comprehensive overview of the mechanism, key genes, regulation, disease links, and research methods for studying GO:0044571, with a focus on how CRISPR-based models can accelerate discovery.
[2Fe-2S] cluster assembly At A Glance
| GO ID | GO:0044571 |
|---|---|
| GO term | [2Fe-2S] cluster assembly |
| Ontology | biological_process |
| Synonym | 2Fe-2S cluster assembly; [2Fe-2S] cluster biosynthetic process |
| Major function | Incorporation of two iron and two sulfur atoms into a [2Fe-2S] cluster |
| Related processes | Iron-sulfur cluster assembly, mitochondrial protein biogenesis, iron homeostasis |
| Key cellular location | Mitochondria (eukaryotes), cytosol (bacteria) |
| Conservation | Highly conserved from bacteria to humans |
What Is GO:0044571?
GO:0044571 ([2Fe-2S] cluster assembly) is defined as the incorporation of two iron atoms and two sulfur atoms into an iron-sulfur cluster. This process results in the formation of a [2Fe-2S] cluster, which can be inserted into target proteins to enable their function. The assembly is a multi-step process that typically involves the mobilization of iron and sulfur, their transfer to a scaffold protein, and subsequent cluster transfer to recipient proteins [1,5].
Why Is [2Fe-2S] cluster assembly Important in Cell Biology?
The assembly of [2Fe-2S] clusters is fundamental to life because these clusters are required for the activity of numerous essential proteins, including respiratory chain complexes, enzymes of the citric acid cycle, DNA repair proteins, and transcription factors. Disruption of this process leads to mitochondrial dysfunction, impaired iron homeostasis, and cell death [1,3]. In humans, mutations in genes encoding the assembly machinery cause diseases such as Friedreich ataxia, ISCU myopathy, and sideroblastic anemia [1,3]. Furthermore, [2Fe-2S] cluster assembly is emerging as a target for cancer therapy and antimicrobial development [1,2].
• Essential for the maturation of mitochondrial respiratory chain complexes I, II, and III.
• Required for the function of enzymes in the citric acid cycle, such as aconitase.
• Involved in DNA repair and genome stability through Fe-S proteins like RAD3 and XPD.
• Critical for iron homeostasis via regulation of iron regulatory proteins and ferritin.
• Dysregulation leads to Friedreich ataxia, a neurodegenerative disease [1,3].
• Mutations in ISCU cause myopathy with exercise intolerance.
• Bacterial [2Fe-2S] cluster assembly is a potential antibiotic target [2,8].
• Plays a role in cancer cell proliferation and metabolic reprogramming.
• Affects plant photosynthesis and nitrogen fixation.
• Provides a model for studying protein cofactor assembly and metal trafficking [1,5].
What Happens During [2Fe-2S] cluster assembly?
Sulfur mobilization and desulfurization
In simple terms: First, sulfur is taken from the amino acid cysteine and made available for cluster building.
The assembly of a [2Fe-2S] cluster begins with the mobilization of sulfur from L-cysteine. In eukaryotes, the cysteine desulfurase NFS1 (with its partner ISD11) catalyzes the conversion of cysteine to alanine, generating a persulfide intermediate on a conserved cysteine residue. This sulfur is then transferred to the scaffold protein ISCU, which serves as the platform for cluster assembly. In bacteria, homologous systems such as IscS and NifS perform similar functions. The desulfurization step is essential and is tightly regulated to prevent toxic sulfur accumulation.
Iron delivery and cluster formation on scaffold proteins
In simple terms: Next, iron atoms are delivered to the scaffold, where they combine with sulfur to form the cluster.
Iron is delivered to the scaffold protein ISCU (or its bacterial homologs) by iron chaperones such as frataxin (FXN) in eukaryotes [1,5]. Frataxin accelerates the formation of [2Fe-2S] clusters on the human Fe-S assembly complex by facilitating iron transfer and possibly serving as an iron donor. The scaffold protein ISCU coordinates the iron and sulfur atoms, leading to the assembly of a transient [2Fe-2S] cluster. In bacteria, NifU acts as a scaffold for [2Fe-2S] cluster assembly in the NIF system, as demonstrated by Yuvaniyama et al. (2000). The cluster on the scaffold is then ready for transfer to recipient proteins.
Cluster transfer to recipient proteins
In simple terms: The finished cluster is then handed off to target proteins that need it to function.
After assembly on the scaffold, the [2Fe-2S] cluster is transferred to recipient proteins. This transfer often requires chaperones and co-chaperones, such as HSC20 and GRP75 in mitochondria. In some cases, the cluster is exported from the mitochondrion to the cytosol via the ABC transporter Atm1p (ABCB7 in humans). Pearson et al. (2020) defined the mechanism of the mitochondrial Atm1p [2Fe-2S] cluster exporter, showing that it binds and transports a [2Fe-2S] cluster. The recipient proteins then fold and mature into functional Fe-S proteins.
Regulation by ferredoxin-2 and frataxin
In simple terms: The assembly process is controlled by proteins like ferredoxin-2 and frataxin to match cellular needs.
Recent studies have revealed cross-regulation of [2Fe-2S] cluster synthesis by ferredoxin-2 (FDX2) and frataxin. Want et al. (2026) showed that FDX2 and frataxin coordinate to regulate the assembly process, ensuring efficient cluster formation and transfer. Ferredoxin-2 provides electrons for the reduction of sulfur during cluster assembly, while frataxin regulates iron availability [1,3]. This regulation is critical for maintaining iron homeostasis and preventing oxidative stress.
Bacterial and specialized [2Fe-2S] cluster assembly systems
In simple terms: Bacteria have their own versions of cluster assembly, sometimes for special tasks like nitrogen fixation.
In bacteria, [2Fe-2S] cluster assembly is carried out by the ISC, SUF, or NIF systems, depending on the organism and conditions [1,8]. The NIF system is dedicated to nitrogenase maturation and involves NifS and NifU. Yuvaniyama et al. (2000) demonstrated that NifS directs the assembly of a transient [2Fe-2S] cluster within NifU. Additionally, [2Fe-2S] clusters can regulate bacterial transcription factors; for example, binding of a [2Fe-2S] cluster drives dimerization of ferric uptake regulator (Fur) in Escherichia coli. These systems provide valuable models for understanding the fundamental mechanisms of cluster assembly.
Key Genes Involved in GO:0044571 [2Fe-2S] cluster assembly
The following genes and proteins are central to [2Fe-2S] cluster assembly, as supported by the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NFS1 | Cysteine desulfurase; provides sulfur for cluster assembly | Knockout causes embryonic lethality; studied in mitochondrial diseases |
| ISCU | Scaffold protein for [2Fe-2S] cluster assembly | Mutations cause myopathy; target for functional studies |
| FXN | Iron chaperone; accelerates cluster formation | Defects cause Friedreich ataxia; key therapeutic target [1,3,5] |
| FDX2 | Electron transfer for sulfur reduction; regulates assembly | Cross-regulates with frataxin; emerging target |
| ABCB7 | Mitochondrial exporter of [2Fe-2S] clusters | Mutations cause sideroblastic anemia; studied in iron metabolism |
| LYRM4 | Essential partner of NFS1 (ISD11) | Required for desulfurase activity; knockout lethal |
| HSC20 | Co-chaperone for cluster transfer | Facilitates transfer to recipient proteins |
| GRP75 | Mitochondrial chaperone | Assists in cluster transfer and protein folding |
| NIFU | Bacterial scaffold for [2Fe-2S] cluster assembly | Model for transient cluster formation |
| NIFS | Bacterial cysteine desulfurase | Directs cluster assembly on NifU |
| FUR | Bacterial transcription factor; binds [2Fe-2S] cluster | Regulates iron homeostasis; dimerization upon cluster binding |
| GRXD | Monothiol glutaredoxin; transfers [2Fe-2S] cluster | Involved in cluster trafficking in fungi |
| CMTA | Metallothionein; receives [2Fe-2S] cluster | Binds and receives cluster from GrxD |
| HYDF | Hydrogenase maturase; contains redox-active [2Fe-2S] cluster | Model for cluster assembly in hydrogenase maturation |
| ATM1P | Mitochondrial ABC transporter | Exports [2Fe-2S] clusters; studied in yeast |
| ISD11 | Accessory protein for NFS1 | Essential for desulfurase function |
| ACO1 | Aconitase; contains [2Fe-2S] cluster | Recipient protein; model for cluster insertion |
| SDHB | Succinate dehydrogenase subunit; contains [2Fe-2S] cluster | Recipient protein; respiratory chain function |
How Is [2Fe-2S] cluster assembly Regulated?
The [2Fe-2S] cluster assembly process is regulated at multiple levels to ensure iron-sulfur homeostasis. In eukaryotes, the iron-sulfur cluster assembly (ISC) machinery is controlled by the iron regulatory protein/iron-responsive element (IRP/IRE) system, which senses cellular iron levels. Additionally, the mitochondrial ISC pathway is regulated by the availability of cysteine and iron, and by the redox state of the cell. Ferredoxin-2 and frataxin cross-regulate the assembly process, as shown by Want et al. (2026). In bacteria, the ferric uptake regulator (Fur) senses iron and regulates genes involved in iron uptake and storage; binding of a [2Fe-2S] cluster to Fur drives its dimerization and DNA binding. This feedback regulation ensures that cluster assembly is matched with cellular demand and prevents toxicity [1,2].
[2Fe-2S] cluster assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FXN | Friedreich ataxia | Knockout or knock-in of expanded GAA repeats in iPSCs; point mutation of FXN [1,3] |
| ISCU | Myopathy with exercise intolerance | Knockout in muscle cells; point mutation (e.g., G50E) knock-in mice |
| ABCB7 | X-linked sideroblastic anemia with ataxia | Knockout in hematopoietic stem cells; overexpression of wild-type ABCB7 |
| NFS1 | Mitochondrial dysfunction; cancer vulnerability | Conditional knockout in cancer cell lines; point mutation of catalytic cysteine |
| FDX2 | Cancer; mitochondrial disorders | Knockout in cancer cells; knock-in of tagged FDX2 for interaction studies |
Friedreich Ataxia
Friedreich ataxia (FRDA) is an autosomal recessive neurodegenerative disorder caused by reduced levels of frataxin (FXN), a key regulator of [2Fe-2S] cluster assembly [1,3]. Frataxin deficiency leads to impaired cluster formation, mitochondrial iron overload, and oxidative stress, resulting in progressive degeneration of sensory neurons and cardiomyopathy [1,3]. Studies by Fox et al. (2015) showed that frataxin accelerates [2Fe-2S] cluster formation on the human Fe-S assembly complex, providing a mechanistic link to disease. Current research focuses on restoring frataxin levels or bypassing the defect using CRISPR-based gene editing [1,3].
ISCU Myopathy and Sideroblastic Anemia
Mutations in ISCU, the scaffold protein for [2Fe-2S] cluster assembly, cause a myopathy with exercise intolerance and lactic acidosis. Similarly, mutations in ABCB7, the mitochondrial exporter of [2Fe-2S] clusters, lead to X-linked sideroblastic anemia with ataxia. These disorders highlight the importance of proper cluster assembly and export for human health [1,4]. Experimental models using patient-derived cells and CRISPR knockout mice have been instrumental in understanding the pathophysiology.
Cancer and Metabolic Reprogramming
Cancer cells often exhibit altered iron-sulfur cluster metabolism to support rapid proliferation. For example, increased expression of ISC components is observed in some tumors, and targeting [2Fe-2S] cluster assembly has been proposed as an anticancer strategy. The [2Fe-2S] cluster-containing protein ferredoxin-2 (FDX2) is involved in cross-regulation with frataxin, and its dysregulation may contribute to cancer progression. CRISPR screens have identified genes in this pathway as potential vulnerabilities in cancer cells.
Bacterial Infections and Antimicrobial Targets
Bacterial [2Fe-2S] cluster assembly is essential for the function of many bacterial proteins, including those involved in respiration and virulence [2,8]. The ferric uptake regulator (Fur) in Escherichia coli binds a [2Fe-2S] cluster, which drives dimerization and regulates iron homeostasis. Inhibitors of bacterial cluster assembly, such as those targeting NifS or NifU, are being explored as novel antibiotics. Understanding these mechanisms can aid in the development of new antimicrobial agents [2,8].
From [2Fe-2S] cluster assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of complete loss of a core assembly gene? | CRISPR knockout (e.g., NFS1, ISCU) in cell lines or organoids |
| How does a specific patient mutation affect cluster assembly? | CRISPR point mutation knock-in (e.g., ISCU G50E, FXN missense) [1,3] |
| Where and when is the protein expressed? | Knock-in of fluorescent or epitope tags (e.g., GFP, HA) at endogenous loci |
| What happens when the gene is overexpressed? | CRISPR activation (CRISPRa) or lentiviral overexpression |
| Which genes are essential for cluster assembly? | Genome-wide CRISPR knockout library screening |
| How does the cluster transfer to recipient proteins? | In vitro reconstitution with purified proteins and tagged scaffolds [5,8] |
How to Study the [2Fe-2S] cluster assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| UV-visible spectroscopy | Absorption spectra of Fe-S clusters | Detection and quantification of [2Fe-2S] clusters [1,6] |
| EPR spectroscopy | Paramagnetic properties of clusters | Characterization of cluster type and redox state [1,6] |
| RNA-seq | Global gene expression changes | Transcriptional response to cluster assembly defects |
| Proteomics | Protein abundance and interactions | Identification of assembly complex components [1,7] |
| CRISPR knockout screening | Gene essentiality and fitness | Discovery of novel assembly genes |
| Fluorescence microscopy | Subcellular localization and dynamics | Tracking tagged assembly proteins [1,4] |
| In vitro reconstitution | Cluster assembly and transfer | Mechanistic studies with purified proteins [5,8] |
| Isothermal titration calorimetry | Binding affinity | Measuring interactions between assembly proteins |
Genetic and Biochemical Approaches
Classical methods to study [2Fe-2S] cluster assembly include the use of bacterial and yeast genetic models, such as deletion mutants of NIFS, NIFU, or ISC genes [1,8]. Biochemical reconstitution assays with purified proteins (e.g., NFS1, ISCU, FXN) allow detailed analysis of cluster formation and transfer. Spectroscopic techniques like UV-visible absorption, electron paramagnetic resonance (EPR), and circular dichroism (CD) are used to detect and characterize [2Fe-2S] clusters [1,6]. These methods have been instrumental in defining the steps of cluster assembly [1,5].
Omics and Systems Biology
Transcriptomics (RNA-seq) and proteomics can reveal global changes in gene expression and protein abundance upon perturbation of [2Fe-2S] cluster assembly. For example, RNA-seq of cells lacking frataxin shows upregulation of iron uptake and oxidative stress response genes. Proteomic approaches can identify novel interaction partners of assembly proteins, such as the interaction between GrxD and CmtA in Aspergillus fumigatus. These omics methods provide a systems-level view of the impact of cluster assembly defects [1,7].
Imaging and Live-Cell Analysis
Fluorescence microscopy with tagged proteins (e.g., GFP-ISCU) allows visualization of the subcellular localization and dynamics of assembly components. Genetically encoded fluorescent sensors for iron and sulfur can monitor intracellular levels in real time. Live-cell imaging has been used to track the mitochondrial export of [2Fe-2S] clusters via Atm1p. These techniques complement biochemical assays by providing spatial and temporal information [1,4].
CRISPR-Based Functional Genomics
CRISPR-Cas9 knockout screens have been used to identify genes required for [2Fe-2S] cluster assembly and to uncover genetic vulnerabilities. For instance, knockout of NFS1 or ISCU in cancer cell lines reduces proliferation, and genome-wide screens can identify synthetic lethal interactions. CRISPR interference (CRISPRi) and activation (CRISPRa) enable fine-tuning of gene expression to study dosage effects. These tools are powerful for dissecting the genetic network of cluster assembly.
How CRISPR Can Be Used to Study GO:0044571 [2Fe-2S] cluster assembly
Knockout
CRISPR knockout (KO) of genes involved in [2Fe-2S] cluster assembly, such as NFS1, ISCU, or FXN, can be used to study loss-of-function phenotypes. For example, KO of ISCU in muscle cells recapitulates the myopathy phenotype and impairs mitochondrial respiration. KO of FXN in neurons leads to neurodegeneration in models of Friedreich ataxia [1,3]. These models are valuable for drug screening and understanding disease mechanisms.
Point Mutation
CRISPR point mutation knock-in allows the introduction of specific patient mutations, such as the ISCU G50E or FXN missense mutations, to study their effects on cluster assembly [1,3]. This approach preserves endogenous expression levels and regulatory context, providing more physiologically relevant models than overexpression. Point mutations in the catalytic cysteine of NFS1 can be used to dissect the desulfurization mechanism.
Knock-in
Knock-in of tags (e.g., GFP, HA, or FLAG) at endogenous loci enables visualization and purification of assembly proteins. For instance, knock-in of a tag on ISCU allows tracking of the scaffold protein and its interactions. Knock-in of reporter genes (e.g., luciferase) under the control of the FXN promoter can be used to screen for compounds that upregulate frataxin [1,3]. These models are essential for studying protein dynamics and regulation.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can be used to increase the levels of [2Fe-2S] cluster assembly proteins, such as FXN or FDX2, to test whether they can rescue defects or enhance cluster production [1,3]. Overexpression of frataxin in Friedreich ataxia models has been shown to improve mitochondrial function [1,3]. Conversely, overexpression of dominant-negative mutants can inhibit the pathway.
How EDITGENE Supports [2Fe-2S] cluster assembly Research
Researchers studying [2Fe-2S] cluster assembly-related genes often need to determine whether a candidate gene is causally involved in the process, how mutations affect function, and what the downstream consequences are. EDITGENE provides a comprehensive suite of CRISPR-based services to address these questions, from generating knockout cell lines to performing genome-wide screens and bioinformatics analysis.
Contact EDITGENE today to design your custom CRISPR model for [2Fe-2S] cluster assembly research.
Frequently Asked Questions About [2Fe-2S] cluster assembly
What is [2Fe-2S] cluster assembly?
[2Fe-2S] cluster assembly (GO:0044571) is the biological process of incorporating two iron atoms and two sulfur atoms into an iron-sulfur cluster, which is then inserted into target proteins to enable their function.
What genes are involved in [2Fe-2S] cluster assembly?
Key genes include NFS1, ISCU, FXN, FDX2, ABCB7, LYRM4, HSC20, GRP75, and bacterial genes like NIFS, NIFU, and FUR [1,2,8].
What diseases are linked to defects in [2Fe-2S] cluster assembly?
Defects cause Friedreich ataxia, ISCU myopathy, sideroblastic anemia, and are implicated in cancer and mitochondrial disorders [1,3,4].
How is [2Fe-2S] cluster assembly regulated?
It is regulated by iron availability, the IRP/IRE system, and cross-regulation between ferredoxin-2 and frataxin, as well as by bacterial Fur [1,2,3].
What is the role of frataxin in [2Fe-2S] cluster assembly?
Frataxin is an iron chaperone that accelerates [2Fe-2S] cluster formation on the human Fe-S assembly complex.
How can CRISPR be used to study [2Fe-2S] cluster assembly?
CRISPR knockout, point mutation knock-in, tagged knock-in, and overexpression models allow functional dissection of genes involved in the process [1,3].
What is the mitochondrial ISC machinery?
The ISC machinery is a multi-protein system in mitochondria that assembles [2Fe-2S] clusters and exports them to other compartments [1,4].
What is the role of Atm1p in [2Fe-2S] cluster assembly?
Atm1p is a mitochondrial ABC transporter that exports [2Fe-2S] clusters from the mitochondrion to the cytosol.
How does the bacterial Fur protein bind [2Fe-2S] clusters?
Binding of a [2Fe-2S] cluster drives dimerization of Fur, enabling it to regulate iron homeostasis genes.
What methods are used to study [2Fe-2S] cluster assembly?
Common methods include UV-visible and EPR spectroscopy, in vitro reconstitution, RNA-seq, proteomics, and CRISPR screens [1,5,6].
Conclusion
GO:0044571 ([2Fe-2S] cluster assembly) is a fundamental biological process required for the maturation of numerous iron-sulfur proteins. Its mechanism involves sulfur mobilization, iron delivery, cluster formation on scaffold proteins, and transfer to recipient proteins, with tight regulation by factors such as frataxin and ferredoxin-2 [1,3,5]. Defects in this process cause severe human diseases, including Friedreich ataxia and myopathies, and are implicated in cancer [1,3,4]. Advances in CRISPR-based models and omics technologies are accelerating our understanding of this pathway and enabling the development of targeted therapies. EDITGENE's comprehensive services support researchers in dissecting the genetic and molecular basis of [2Fe-2S] cluster assembly and its role in health and disease.
References
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- 3. Want K et al.. 2026. Cross-regulation of [2Fe-2S] cluster synthesis by ferredoxin-2 and frataxin.. Nature 649(8097):721-728 PMID: 41372413
- 4. Pearson SA et al.. 2020. Defining the mechanism of the mitochondrial Atm1p [2Fe-2S] cluster exporter.. Metallomics 12(6):902-915 PMID: 32337520
- 5. Fox NG et al.. 2015. Frataxin Accelerates [2Fe-2S] Cluster Formation on the Human Fe-S Assembly Complex.. Biochemistry 54(25):3880-9 PMID: 26016518
- 6. Shepard EM et al.. 2016. A Redox Active [2Fe-2S] Cluster on the Hydrogenase Maturase HydF.. Biochemistry 55(25):3514-27 PMID: 27232385
- 7. Eap D et al.. 2025. Aspergillus fumigatus Metallothionein CmtA Binds and Receives a [2Fe-2S] Cluster from Monothiol Glutaredoxin GrxD.. J Am Chem Soc 147(37):34045-34058 PMID: 40911875
- 8. Yuvaniyama P et al.. 2000. NifS-directed assembly of a transient [2Fe-2S] cluster within the NifU protein.. Proc Natl Acad Sci U S A 97(2):599-604 PMID: 10639125
