GO:1990204 oxidoreductase complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1990204 (oxidoreductase complex) is a cellular_component term defined as any protein complex that possesses oxidoreductase activity.
• Members include mitochondrial respiratory complexes such as complex I and complex II, which transfer electrons in bioenergetic membranes.
• The term also covers non-mitochondrial redox complexes, including the retinoid oxidoreductase complex and the heterodisulfide oxidoreductase complex of methanogens.
• Assembly and regulation of oxidoreductase complexes are linked to metabolic adaptation, hypoxia responses, and platelet mechanobiology.
• Dysfunction of oxidoreductase complexes underlies mitochondrial cytopathies and contributes to cancer and cardiovascular pathology.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of oxidoreductase complex components.
Description
GO:1990204 oxidoreductase complex is a Gene Ontology cellular_component term that describes any protein complex possessing oxidoreductase activity. Oxidoreductase complexes are central to biological energy transduction, redox homeostasis, and metabolism, and they include the mitochondrial respiratory chain complexes that transfer electrons from NADH or succinate to ubiquinone. The term captures both well-characterized respiratory complexes and specialized redox machines such as the retinoid oxidoreductase complex and the heterodisulfide oxidoreductase complex of methanogenic archaea. Because these complexes couple electron transfer to proton translocation or substrate reduction, their composition and assembly are tightly regulated and are frequently altered in disease. Researchers study oxidoreductase complexes to understand mitochondrial bioenergetics, metabolic adaptation, and the molecular basis of cytopathies and other disorders. The broad definition of GO:1990204 makes it a useful annotation target for any protein assembly whose defining biochemical property is oxidoreductase catalysis.
oxidoreductase complex At A Glance
| GO ID | GO:1990204 |
|---|---|
| GO term | oxidoreductase complex |
| Ontology | cellular_component |
| Synonym | oxidation-reduction complex; redox complex |
| Definition | Any protein complex that possesses oxidoreductase activity. |
| Major function | Electron transfer and redox catalysis within a multi-subunit assembly |
| Representative members | Mitochondrial complex I, complex II, retinoid oxidoreductase complex, heterodisulfide oxidoreductase complex |
| Related disease examples | Mitochondrial cytopathies, metabolic and cardiovascular disorders |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, proteomics, respirometry, imaging |
What Is GO:1990204?
In our own words, GO:1990204 oxidoreductase complex refers to a macromolecular assembly of two or more proteins whose collective biochemical function is oxidoreductase activity, meaning it catalyzes the transfer of electrons from a donor to an acceptor. The term is ontology-agnostic with respect to substrate and membrane topology, so it includes respiratory chain complexes, disulfide-generating redox complexes, and archaeal heterodisulfide reductases. It is a child of protein-containing complex and is used to annotate cellular components rather than individual catalytic subunits.
Why Is oxidoreductase complex Important in Cell Biology?
Oxidoreductase complexes are essential for cellular energy conversion and redox balance, and their dysfunction is directly implicated in human disease. Mitochondrial complex I and complex II are oxidoreductase complexes whose defects cause cytopathies with neurological and cardiac manifestations. Beyond mitochondria, oxidoreductase complexes participate in retinoid metabolism, methanogenesis, platelet mechanobiology, and hypoxic adaptation, making GO:1990204 relevant across cell biology, microbiology, and translational medicine.
• They catalyze electron transfer reactions that underpin oxidative phosphorylation and cellular ATP production.
• Complex I and complex II defects are established causes of mitochondrial cytopathies.
• The retinoid oxidoreductase complex controls vitamin A-derived signaling molecules.
• The heterodisulfide oxidoreductase complex is a key energy-conserving enzyme in methanogens.
• Oxidoreductase complexes contribute to metabolic adaptation via ER-mitochondria signaling.
• MICAL1, an oxidoreductase, links redox chemistry to actin disassembly and platelet function.
• Oxidoreductase-like domain containing 1 protects myocardial cells under hypoxia.
• Alternative oxidases illustrate how simple oxidoreductase proteins can serve complex physiological roles.
• They are tractable targets for CRISPR-based functional genomics and drug discovery.
• Their assembly and regulation are responsive to stress, oxygen, and metabolic cues.
What Happens During oxidoreductase complex?
Electron transfer and redox catalysis
In simple terms: The complex moves electrons from one molecule to another, like a molecular wire.
Oxidoreductase complexes catalyze electron transfer between donor and acceptor substrates, a reaction class that includes NADH:quinone oxidoreduction by complex I and succinate:quinone oxidoreduction by complex II. In the heterodisulfide oxidoreductase complex of Methanobacterium thermoautotrophicum, the assembly couples reduced cofactors to heterodisulfide reduction as part of methanogenic energy conservation. The retinoid oxidoreductase complex similarly catalyzes oxidation-reduction of retinoid substrates in a multi-protein assembly.
Proton translocation and energy conservation
In simple terms: Some of these complexes use electron transfer to pump protons and store energy.
The energy-transducing NADH:quinone oxidoreductase, complex I, couples electron transfer to proton translocation across the inner mitochondrial membrane, contributing to the proton motive force. Complex II, although part of the respiratory chain, is a membrane-bound oxidoreductase whose dysfunction is linked to mitochondrial cytopathies. These bioenergetic functions depend on the intact multi-subunit architecture of the oxidoreductase complex.
Metabolic and stress-responsive adaptation
In simple terms: Cells adjust these complexes when they face metabolic or oxygen stress.
The endoplasmic reticulum kinase PERK interacts with the oxidoreductase ERO1 to metabolically adapt mitochondria, linking oxidoreductase activity to integrated stress signaling. Oxidoreductase-like domain containing 1 plays a mitochondrial protection role in myocardial cells under hypoxia, indicating that oxidoreductase complexes participate in hypoxic adaptation. Alternative oxidases provide a non-protonmotive bypass that modulates respiratory flux under changing conditions.
Redox signaling and cytoskeletal control
In simple terms: Oxidoreductase activity can also control cell shape and adhesion.
The oxidoreductase MICAL1 mediates F-actin disassembly and promotes mechano-dependent VWF-GPIbα interaction in platelets, showing that oxidoreductase complexes can regulate cytoskeletal dynamics and hemostasis. This expands the functional scope of GO:1990204 beyond classical bioenergetics to include redox-dependent signaling and cell adhesion.
Key Genes Involved in GO:1990204 oxidoreductase complex
The following genes and proteins represent well-documented components or regulators of oxidoreductase complexes across mitochondrial, ER, archaeal, and cytoskeletal contexts.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NDUFS1 | Core subunit of mitochondrial complex I | Complex I assembly and cytopathy modeling |
| NDUFV1 | NADH-binding subunit of complex I | Electron transfer and mitochondrial disease |
| SDHA | Catalytic subunit of complex II | Mitochondrial cytopathy and tumor metabolism |
| SDHB | Iron-sulfur subunit of complex II | Respiratory chain function and disease |
| ERO1 | ER oxidoreductase interacting with PERK | ER-mitochondria metabolic adaptation |
| PERK | ER kinase regulating ERO1 interaction | Integrated stress response and mitochondrial adaptation |
| MICAL1 | Oxidoreductase controlling actin disassembly | Platelet mechanobiology and VWF-GPIbα interaction |
| OXLD1 | Oxidoreductase-like domain containing 1 | Myocardial protection under hypoxia |
| AOX | Alternative oxidase | Non-protonmotive respiratory bypass |
| RDH | Retinoid oxidoreductase component | Retinoid metabolism and recombinant complex isolation |
| HdrA | Heterodisulfide oxidoreductase subunit | Methanogenic energy conservation |
| HdrB | Heterodisulfide oxidoreductase subunit | Archaeal redox biochemistry |
| HdrC | Heterodisulfide oxidoreductase subunit | Electron transfer in methanogens |
| NDUFA1 | Accessory subunit of complex I | Complex I stability and assembly |
| NDUFB8 | Accessory subunit of complex I | Respiratory chain diagnostics |
| SDHC | Membrane anchor of complex II | Complex II assembly and cytopathy |
| SDHD | Small subunit of complex II | Mitochondrial disease and oxygen sensing |
How Is oxidoreductase complex Regulated?
Oxidoreductase complexes are regulated at multiple levels. The ER kinase PERK interacts with the oxidoreductase ERO1 to metabolically adapt mitochondria, placing oxidoreductase function under the control of the integrated stress response. Hypoxia modulates oxidoreductase-like domain containing 1 to protect myocardial cells, indicating oxygen-dependent regulation. Alternative oxidases provide a regulated bypass of the cytochrome pathway, allowing respiratory flexibility. In platelets, MICAL1-dependent actin disassembly is mechano-dependent, showing that oxidoreductase activity can be controlled by mechanical cues.
oxidoreductase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SDHA | Mitochondrial cytopathy | Knockout in cardiomyocytes or neurons |
| SDHB | Mitochondrial cytopathy and tumor metabolism | Point-mutation knock-in in cell lines |
| NDUFS1 | Complex I deficiency | Knockout with respirometry |
| ERO1 | ER stress-related metabolic disease | Overexpression and PERK interaction studies |
| MICAL1 | Platelet adhesion and thrombosis | Knockout in platelet-like cells under flow |
| OXLD1 | Myocardial hypoxia injury | Overexpression in hypoxic cardiomyocytes |
Mitochondrial cytopathies
Cytopathies involving mitochondrial complex II demonstrate that defects in oxidoreductase complexes cause human disease with neurological and cardiac features. Complex I dysfunction is similarly central to mitochondrial disease mechanisms.
Cardiovascular and hypoxic injury
Oxidoreductase-like domain containing 1 protects myocardial cells under hypoxia, linking oxidoreductase complexes to cardiac ischemic responses. MICAL1-dependent oxidoreductase activity promotes platelet adhesion under flow, connecting redox complexes to thrombotic biology.
Metabolic and ER stress-related disorders
The PERK-ERO1 oxidoreductase interaction adapts mitochondria metabolically, implicating oxidoreductase complexes in ER stress-related metabolic disease. Alternative oxidases modulate respiratory efficiency and may influence metabolic phenotypes.
Retinoid-related pathology
The retinoid oxidoreductase complex generates and interconverts retinoids, so its dysfunction may affect vitamin A-dependent signaling and related disorders.
From oxidoreductase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a subunit required for complex I assembly? | CRISPR knockout of NDUFS1 |
| Does a point mutation alter complex II catalysis? | CRISPR point mutation in SDHA |
| Can a tagged subunit report complex composition? | Knock-in of an epitope tag |
| Does overexpression protect against hypoxia? | Overexpression of OXLD1 |
| Does loss of MICAL1 affect platelet adhesion? | Knockout in platelet model under flow |
| Does ERO1-PERK interaction change metabolism? | Knock-in or knockout of ERO1 |
How to Study the oxidoreductase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Respirometry | Oxygen consumption and electron flux | Complex I/II function |
| Enzyme activity assay | Oxidoreductase catalytic rate | Recombinant complex characterization |
| Affinity purification | Complex composition | Subunit identification |
| Co-immunoprecipitation | Protein-protein interactions | PERK-ERO1 regulation |
| Live-cell imaging | Actin dynamics and adhesion | MICAL1 platelet studies |
| Hypoxia challenge assay | Mitochondrial protection | OXLD1 function |
| CRISPR knockout | Gene requirement | Subunit essentiality |
| Overexpression | Gain-of-function effects | Hypoxic cardioprotection |
Biochemical isolation of oxidoreductase complexes
Recombinant retinoid oxidoreductase complex can be generated and isolated for enzymatic assays, providing a template for purifying other oxidoreductase complexes. Composition and properties of the heterodisulfide oxidoreductase complex were defined biochemically in Methanobacterium thermoautotrophicum.
Respirometry and enzyme activity assays
Complex I and complex II activities are measured by electron transfer assays and respirometry to assess oxidoreductase complex function in cells and mitochondria.
Proteomics and interaction mapping
Interaction studies such as PERK-ERO1 mapping reveal how oxidoreductase complexes are regulated and assembled. Affinity purification of tagged subunits supports compositional analysis.
Imaging and functional cell assays
Platelet flow assays and actin imaging demonstrate MICAL1-dependent oxidoreductase function in mechanobiology. Hypoxia models assess OXLD1-dependent mitochondrial protection.
How CRISPR Can Be Used to Study GO:1990204 oxidoreductase complex
Knockout
CRISPR knockout of oxidoreductase complex subunits such as NDUFS1 or SDHA can test whether the subunit is required for complex assembly and respiratory function. Knockout of MICAL1 tests its role in platelet actin disassembly and adhesion.
Point Mutation
Point mutations in complex II subunits are associated with cytopathies, so CRISPR point-mutation models can reproduce catalytic or assembly defects. Point mutations in oxidoreductase-like domain containing 1 could test hypoxia-protective residues.
Knock-in
Knock-in of epitope tags into oxidoreductase complex subunits enables affinity purification and compositional analysis, as exemplified by recombinant retinoid oxidoreductase complex isolation. Knock-in of disease-associated alleles supports mechanistic studies.
Overexpression
Overexpression of OXLD1 protects myocardial cells under hypoxia, providing a gain-of-function model for oxidoreductase complex biology. Overexpression of ERO1 or PERK components can probe ER-mitochondria metabolic adaptation.
How EDITGENE Supports oxidoreductase complex Research
Researchers studying oxidoreductase complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, catalysis, or disease phenotypes. EDITGENE provides CRISPR-based cell models and screening services to test these hypotheses directly.
Contact EDITGENE today to design your custom CRISPR model for oxidoreductase complex research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
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| LDHC Knockout HEK293 Cell Line | EDJ-KQ919 | Human | 3948 | Details Get a Quote |
| LDHAL6B Knockout HEK293 Cell Line | EDJ-KQ1517 | Human | 92483 | Details Get a Quote |
| LDHA Knockout HEK293 Cell Line | EDJ-KQ1518 | Human | 3939 | Details Get a Quote |
| LDHB Knockout HEK293 Cell Line | EDJ-KQ1519 | Human | 3945 | Details Get a Quote |
| CBR4 Knockout HEK293 Cell Line | EDJ-KQ3974 | Human | 84869 | Details Get a Quote |
| HSD17B8 Knockout HEK293 Cell Line | EDJ-KQ5443 | Human | 7923 | Details Get a Quote |
| LDHA Knockout A-549 Cell Line | EDJ-KQ21153 | Human | 3939 | Details Get a Quote |
| LDHA Knockout HCT 116 Cell Line | EDJ-KQ21154 | Human | 3939 | Details Get a Quote |
| LDHA Knockout HeLa Cell Line | EDJ-KQ21155 | Human | 3939 | Details Get a Quote |
| LDHB Knockout A-549 Cell Line | EDJ-KQ21156 | Human | 3945 | Details Get a Quote |
| LDHB Knockout HCT 116 Cell Line | EDJ-KQ21157 | Human | 3945 | Details Get a Quote |
| LDHB Knockout HeLa Cell Line | EDC10188 | Human | 3945 | Details Get a Quote |
| HSD17B8 Knockout A-549 Cell Line | EDJ-KQ29934 | Human | 7923 | Details Get a Quote |
| HSD17B8 Knockout HCT 116 Cell Line | EDJ-KQ29936 | Human | 7923 | Details Get a Quote |
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Frequently Asked Questions About oxidoreductase complex
What is GO:1990204 oxidoreductase complex?
GO:1990204 is a Gene Ontology cellular_component term defined as any protein complex that possesses oxidoreductase activity.
What genes are involved in oxidoreductase complex?
Genes include NDUFS1 and other complex I subunits, SDHA/SDHB of complex II, ERO1, MICAL1, OXLD1, and archaeal heterodisulfide oxidoreductase subunits.
What does oxidoreductase complex do in cells?
It catalyzes electron transfer and redox reactions, contributing to respiration, energy conservation, and redox signaling.
Is oxidoreductase complex involved in mitochondrial disease?
Yes, defects in complex I and complex II oxidoreductase complexes cause mitochondrial cytopathies.
How is oxidoreductase complex regulated?
It is regulated by stress signaling such as PERK-ERO1 interaction, hypoxia, and mechanical cues.
What methods study oxidoreductase complex?
Respirometry, enzyme assays, affinity purification, imaging, and CRISPR editing are commonly used.
Can CRISPR knockout oxidoreductase complex genes?
Yes, knockout of subunits such as NDUFS1 or SDHA tests their requirement for complex function.
What diseases involve oxidoreductase complex dysfunction?
Mitochondrial cytopathies, cardiovascular hypoxia injury, and metabolic disorders have been linked to oxidoreductase complex dysfunction.
What is the retinoid oxidoreductase complex?
It is a multi-protein oxidoreductase complex that can be generated and isolated recombinantly for retinoid metabolism studies.
What is the heterodisulfide oxidoreductase complex?
It is an archaeal oxidoreductase complex from Methanobacterium thermoautotrophicum involved in methanogenic energy conservation.
Conclusion
GO:1990204 oxidoreductase complex defines a broad and functionally critical class of protein assemblies that catalyze electron transfer across mitochondrial, ER, archaeal, and cytoskeletal contexts. Their roles in respiration, metabolic adaptation, and disease make them important targets for mechanistic and translational research. CRISPR-based knockout, point-mutation, knock-in, and overexpression models provide direct causal tests of oxidoreductase complex gene function.
References
- 1. Bassot A et al.. 2023. The endoplasmic reticulum kinase PERK interacts with the oxidoreductase ERO1 to metabolically adapt mitochondria.. Cell Rep 42(1):111899 PMID: 36586409
- 2. Adams MK et al.. 2020. Generation and isolation of recombinant retinoid oxidoreductase complex.. Methods Enzymol 637:77-93 PMID: 32359661
- 3. Yano T. 2002. The energy-transducing NADH: quinone oxidoreductase, complex I.. Mol Aspects Med 23(5):345-68 PMID: 12231006
- 4. Solarz J et al.. 2025. F-actin disassembly by the oxidoreductase MICAL1 promotes mechano-dependent VWF-GPIbα interaction in platelets.. Nat Commun 16(1):7375 PMID: 40783397
- 5. Young L et al.. 2013. The alternative oxidases: simple oxidoreductase proteins with complex functions.. Biochem Soc Trans 41(5):1305-11 PMID: 24059524
- 6. Yan Y et al.. 2026. Mitochondrial protection role of oxidoreductase-like domain containing 1 in myocardial cells under hypoxia.. Med Gas Res 16(2):116-124 PMID: 40826934
- 7. Setzke E et al.. 1994. H2: heterodisulfide oxidoreductase complex from Methanobacterium thermoautotrophicum. Composition and properties.. Eur J Biochem 220(1):139-48 PMID: 8119281
- 8. Ackrell BA. 2002. Cytopathies involving mitochondrial complex II.. Mol Aspects Med 23(5):369-84 PMID: 12231007
