GO:0016684 oxidoreductase activity, acting on peroxide as acceptor: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016684 describes a molecular function: catalysis of a redox reaction in which a peroxide group acts as the hydrogen or electron acceptor.
• Enzymes with this activity include catalase, peroxidases, and cytochrome c, which detoxify peroxides and regulate reactive sulfur species.
• The reaction is central to oxidative stress defense, protein folding, and mitochondrial import.
• Dysregulation of peroxide-accepting oxidoreductases is linked to cancer, neurodegeneration, and chronic obstructive pulmonary disease.
• CRISPR knockout, point-mutation, and knock-in models enable precise dissection of catalytic residues and physiological roles.
• EDITGENE provides custom cell models and library screening to study GO:0016684-related genes at scale.
Description
GO:0016684, oxidoreductase activity, acting on peroxide as acceptor, is a molecular function term in the Gene Ontology that defines enzymes catalyzing redox reactions where a peroxide group serves as the hydrogen or electron acceptor. This activity is fundamental to cellular antioxidant defense, as it directly removes hydrogen peroxide and organic peroxides, preventing oxidative damage to lipids, proteins, and DNA. The term encompasses well-known enzymes such as catalase, glutathione peroxidase, and cytochrome c peroxidase, which are conserved across eukaryotes and prokaryotes. Researchers study GO:0016684 to understand how cells maintain redox homeostasis, how pathogens defend against host immune bursts, and how mitochondrial protein import relies on redox chemistry. In yeast, the sulfhydryl oxidase Erv1 uses a peroxide-accepting mechanism to form disulfide bonds during protein import and folding. In mammals, catalase can act as a sulfide-sulfur oxidoreductase, regulating reactive sulfur species (RSS) and influencing signaling and detoxification. Dysregulation of these enzymes is implicated in cancer, neurodegenerative diseases, and chronic obstructive pulmonary disease (COPD). Thus, GO:0016684 represents a critical node at the intersection of redox biology, protein quality control, and disease pathogenesis.
oxidoreductase activity, acting on peroxide as acceptor At A Glance
| GO ID | GO:0016684 |
|---|---|
| GO term | oxidoreductase activity, acting on peroxide as acceptor |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Catalysis of redox reactions where peroxide is the electron/hydrogen acceptor |
| Representative enzymes | Catalase, peroxidase, cytochrome c peroxidase, sulfhydryl oxidase |
| Cellular roles | Antioxidant defense, protein folding, mitochondrial import, sulfur metabolism |
| Disease links | Cancer, neurodegeneration, COPD, oxidative stress-related disorders |
What Is GO:0016684?
According to the Gene Ontology, GO:0016684 is defined as catalysis of an oxidation-reduction (redox) reaction in which the peroxide group acts as a hydrogen or electron acceptor. In simpler terms, these enzymes transfer electrons or hydrogen from a substrate to a peroxide molecule, reducing the peroxide (often to water or an alcohol) while oxidizing the substrate. This activity is distinct from other oxidoreductases that use oxygen, NAD+, or other acceptors. The term is a molecular_function in the GO ontology and includes enzymes such as catalase, peroxidase, and cytochrome c peroxidase.
Why Is oxidoreductase activity, acting on peroxide as acceptor Important in Cell Biology?
GO:0016684 is essential because it governs the detoxification of reactive oxygen species (ROS) and reactive sulfur species (RSS), which are central to cellular signaling, immune defense, and aging. Enzymes with this activity protect cells from oxidative damage and regulate redox-sensitive pathways, making them attractive therapeutic targets in cancer, neurodegeneration, and inflammatory diseases. Moreover, the catalytic mechanisms of these enzymes inform the design of biocatalysts and biosensors.
• Protects cells from hydrogen peroxide and organic peroxides, preventing oxidative damage to DNA, proteins, and lipids.
• Regulates reactive sulfur species (RSS) and hydrogen sulfide signaling, impacting vascular tone and neurotransmission.
• Facilitates protein folding and disulfide bond formation in the mitochondrial intermembrane space.
• Involved in the metabolism of polycyclic aromatic hydrocarbons and xenobiotics.
• Contributes to host defense against pathogens by detoxifying neutrophil-derived peroxides.
• Dysregulation is linked to cancer progression, neurodegeneration, and chronic obstructive pulmonary disease.
• Serves as a target for biocatalyst engineering and biosensor development.
• Provides a model system for studying redox enzymology and electron transfer.
What Happens During oxidoreductase activity, acting on peroxide as acceptor?
Substrate binding and peroxide activation
In simple terms: The enzyme grabs a peroxide molecule and prepares it to accept electrons.
Enzymes with GO:0016684 activity bind a peroxide substrate (e.g., H2O2 or organic peroxide) in their active site, often via a heme iron or a redox-active cysteine residue. For catalase, the heme iron coordinates the peroxide, facilitating heterolytic cleavage of the O-O bond to form a ferryl intermediate (Compound I). In cytochrome c peroxidase, the heme iron similarly activates peroxide, leading to formation of a radical intermediate. This step is critical for converting the peroxide into a better electron acceptor.
Electron transfer from donor substrate
In simple terms: The enzyme takes electrons from another molecule and gives them to the peroxide.
Once activated, the peroxide accepts electrons from a reducing substrate, which can be another protein, a small molecule, or a metal center. In catalase, the ferryl intermediate is reduced by a second peroxide molecule, yielding water and oxygen. In sulfhydryl oxidase, electrons are transferred from thiol groups in substrate proteins to the peroxide, forming disulfide bonds. This electron transfer is often coupled to proton movement and can involve redox cofactors such as FAD or heme.
Product release and catalytic turnover
In simple terms: The enzyme releases the reduced peroxide (usually water) and resets for another round.
After electron transfer, the reduced peroxide (e.g., water or alcohol) is released from the active site, and the enzyme returns to its resting state. Catalase completes a two-step cycle: first, peroxide is reduced to water with concomitant oxidation of the heme to Compound I; second, Compound I is reduced by another peroxide, producing water and oxygen. The catalytic efficiency (kcat/KM) of these enzymes is often very high, reflecting their role in rapid detoxification.
Regulation by redox environment and cofactors
In simple terms: The enzyme's activity depends on the cell's redox state and available cofactors.
The activity of peroxide-accepting oxidoreductases is modulated by the local redox potential, pH, and availability of cofactors such as heme, FAD, or NADPH. For example, Erv1 requires FAD and a redox-active disulfide for its sulfhydryl oxidase activity, and its function is linked to the mitochondrial import machinery. In catalase, heme biosynthesis and iron availability directly affect enzyme levels and activity. Post-translational modifications, such as phosphorylation or S-nitrosylation, can also regulate these enzymes under stress conditions.
Key Genes Involved in GO:0016684 oxidoreductase activity, acting on peroxide as acceptor
The following genes encode proteins with demonstrated or inferred oxidoreductase activity acting on peroxide as an acceptor, based on published biochemical and genetic studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CAT | Catalase; decomposes hydrogen peroxide to water and oxygen | Oxidative stress defense; cancer and neurodegeneration models |
| GPX1 | Glutathione peroxidase 1; reduces H2O2 and organic peroxides using glutathione | Redox homeostasis; cardiovascular and cancer studies |
| CYCS | Cytochrome c; peroxidase activity facilitates cardiolipin oxidation and apoptosis | Mitochondrial apoptosis; neurodegeneration |
| ERV1 | Sulfhydryl oxidase; forms disulfide bonds in mitochondrial intermembrane space proteins | Mitochondrial protein import; yeast models |
| QSOX1 | Quiescin sulfhydryl oxidase 1; oxidizes thiols in secreted proteins | Protein folding; cancer biomarker |
| PRDX1 | Peroxiredoxin 1; reduces peroxides using thioredoxin | Antioxidant defense; cancer and inflammation |
| PRDX2 | Peroxiredoxin 2; reduces peroxides in red blood cells | Hemolytic anemia; oxidative stress |
| PRDX3 | Peroxiredoxin 3; mitochondrial peroxide reduction | Mitochondrial redox regulation |
| PRDX4 | Peroxiredoxin 4; ER peroxide reduction and oxidative folding | ER stress; protein secretion |
| PRDX5 | Peroxiredoxin 5; broad peroxide reductase | Inflammation; cancer |
| PRDX6 | Peroxiredoxin 6; glutathione peroxidase and phospholipase A2 | Lung disease; COPD |
| TPO | Thyroid peroxidase; iodinates thyroglobulin using H2O2 | Thyroid hormone synthesis; autoimmune thyroiditis |
| MPO | Myeloperoxidase; produces hypochlorous acid from H2O2 | Innate immunity; atherosclerosis |
| EPX | Eosinophil peroxidase; oxidizes halides and nitrite | Asthma; allergic inflammation |
| LPO | Lactoperoxidase; antimicrobial peroxidase in milk and saliva | Innate immunity; food preservation |
| PXD1 | Peroxidasin; forms sulfilimine bonds in collagen IV | Extracellular matrix; basement membrane |
| DIO1 | Iodothyronine deiodinase 1; uses peroxide to remove iodine from thyroid hormones | Thyroid hormone metabolism |
| DIO2 | Iodothyronine deiodinase 2; activates thyroid hormone | Thyroid hormone signaling; metabolism |
How Is oxidoreductase activity, acting on peroxide as acceptor Regulated?
The activity of enzymes with GO:0016684 is regulated at multiple levels. Transcriptional control via Nrf2/ARE pathway upregulates catalase, peroxiredoxins, and glutathione peroxidases under oxidative stress. Post-translational modifications, including phosphorylation, acetylation, and S-nitrosylation, modulate catalytic activity and protein stability. Cofactor availability (heme, FAD, NADPH) and redox potential also influence enzyme function. In mitochondria, Erv1 activity is coupled to the import machinery and regulated by the redox state of the intermembrane space.
oxidoreductase activity, acting on peroxide as acceptor and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CAT | Oxidative stress; cancer; neurodegeneration | CAT knockout HeLa cells; point mutation of catalytic His |
| PRDX6 | COPD; lung inflammation | PRDX6 knockout A549 cells; overexpression in BEAS-2B |
| CYCS | Apoptosis; neurodegeneration | CYCS knock-in with peroxidase-dead mutation in SH-SY5Y |
| ERV1 | Mitochondrial myopathy; protein import defects | ERV1 knockout yeast; human GFER knock-in |
| MPO | Atherosclerosis; innate immunity | MPO knockout THP-1 macrophages; overexpression in endothelial cells |
Oxidative stress and cancer
Altered expression of peroxide-accepting oxidoreductases is common in cancer. For example, catalase downregulation increases H2O2 levels, promoting DNA damage and tumor progression. Peroxiredoxins are often overexpressed in tumors, contributing to chemoresistance. Dihydrodiol dehydrogenase, an oxidoreductase acting on peroxide, is involved in polycyclic aromatic hydrocarbon metabolism and carcinogen activation.
Neurodegeneration
In Alzheimer's and Parkinson's diseases, impaired peroxide detoxification leads to oxidative damage and neuronal death. Cytochrome c peroxidase activity is linked to cardiolipin oxidation and apoptosis in neurons. Mutations in peroxiredoxins and catalase are associated with increased susceptibility to neurodegeneration.
Chronic obstructive pulmonary disease (COPD)
COPD is characterized by chronic oxidative stress. Processing methods of Platycodonis radix affect markers linked to COPD, and peroxiredoxin 6 (PRDX6) has been implicated in lung protection. Targeting peroxide-accepting oxidoreductases may reduce airway inflammation and emphysema.
From oxidoreductase activity, acting on peroxide as acceptor-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CAT increase sensitivity to oxidative stress? | CAT knockout cell line (e.g., HeLa, HEK293) |
| What is the catalytic role of a specific heme residue in peroxidase? | Point mutation (e.g., His -> Ala) knock-in in endogenous locus |
| How does Erv1 disulfide relay affect mitochondrial import? | ERV1 knockout yeast complemented with human GFER knock-in |
| Can overexpression of PRDX6 protect against COPD-related stress? | PRDX6 overexpression in lung epithelial cells |
| What is the interactome of catalase under oxidative stress? | Endogenous CAT tagged with FLAG/HA via knock-in |
| Which genes modulate sensitivity to peroxide? | Genome-wide CRISPR knockout library screening |
How to Study the oxidoreductase activity, acting on peroxide as acceptor Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Catalase activity assay | H2O2 consumption at 240 nm | Quantify CAT activity in cell lysates |
| Peroxidase-coupled fluorometric assay | Peroxide-dependent fluorescence | Measure membrane dipeptidase/peroxidase activity |
| CRISPR knockout | Gene function loss | Test oxidative stress sensitivity |
| Proximity labeling (APEX2) | Protein interactome | Identify substrates of Erv1 |
| Redox biosensors (HyPer) | Intracellular H2O2 levels | Live-cell imaging of redox changes |
| Sulfhydryl oxidase assay | Disulfide bond formation | Measure Erv1 activity |
| Sulfide-sulfur oxidoreductase assay | RSS production | Study catalase-dependent RSS regulation |
| Enzyme kinetics (stopped-flow) | Catalytic rate constants | Characterize Erv1 mutants |
Enzymatic activity assays
Direct measurement of peroxide consumption or oxygen production using spectrophotometric or fluorometric assays is standard for GO:0016684 enzymes. For example, catalase activity is monitored by the decrease in absorbance at 240 nm as H2O2 is consumed. Fluorometric assays for membrane dipeptidase have been adapted for peroxidase activity.
Genetic knockout and knockdown
CRISPR-Cas9 knockout of genes encoding peroxide-accepting oxidoreductases (e.g., CAT, PRDX6) allows assessment of their contribution to oxidative stress resistance, proliferation, and disease phenotypes. RNAi knockdown provides a complementary approach for essential genes.
Protein interaction and proximity labeling
Tagged knock-in of oxidoreductases with APEX2 or BioID enables proximity labeling to identify interacting partners and substrates in living cells. Co-immunoprecipitation and mass spectrometry can reveal redox-dependent interactions.
Redox imaging and biosensors
Genetically encoded fluorescent biosensors (e.g., HyPer, roGFP) allow real-time monitoring of H2O2 and redox state in cells with altered oxidoreductase activity. These tools are valuable for linking GO:0016684 function to dynamic signaling.
How CRISPR Can Be Used to Study GO:0016684 oxidoreductase activity, acting on peroxide as acceptor
Knockout
CRISPR knockout of genes such as CAT, PRDX6, or ERV1 creates cell models to study loss of peroxide-accepting oxidoreductase activity. These models reveal roles in oxidative stress resistance, mitochondrial function, and disease progression.
Point Mutation
Point mutations in catalytic residues (e.g., heme-binding His in catalase, redox-active Cys in Erv1) can be introduced via CRISPR base editing or homology-directed repair to dissect mechanism without altering protein levels.
Knock-in
Knock-in of tagged versions (e.g., FLAG, HA, APEX2) at endogenous loci allows visualization and interactome analysis of oxidoreductases under native regulation. Disease-associated mutations can also be knocked in to model human disorders.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of CAT, PRDX6, or GPX1 can test protective effects against oxidative stress and identify therapeutic candidates.
How EDITGENE Supports oxidoreductase activity, acting on peroxide as acceptor Research
Researchers studying oxidoreductase activity, acting on peroxide as acceptor-related genes often need to determine whether a candidate gene is causally involved in redox regulation, disease progression, or drug response. EDITGENE provides a comprehensive suite of CRISPR services to generate precisely engineered cell models, enabling functional validation and high-throughput screening.
Contact EDITGENE today to design your custom CRISPR model for oxidoreductase activity, acting on peroxide as acceptor research.
Frequently Asked Questions About oxidoreductase activity, acting on peroxide as acceptor
What is GO:0016684?
GO:0016684 is a Gene Ontology molecular function term defined as catalysis of an oxidation-reduction reaction in which a peroxide group acts as a hydrogen or electron acceptor.
What enzymes have oxidoreductase activity acting on peroxide as acceptor?
Enzymes include catalase, glutathione peroxidase, peroxiredoxins, cytochrome c peroxidase, and sulfhydryl oxidases such as Erv1.
What genes are involved in GO:0016684?
Key genes include CAT, GPX1, PRDX1-6, CYCS, ERV1, MPO, TPO, and DIO1/2.
How is oxidoreductase activity acting on peroxide as acceptor measured?
Common methods include spectrophotometric catalase assays, fluorometric peroxidase assays, and redox biosensors.
Why is GO:0016684 important in disease?
Dysregulation leads to oxidative stress, cancer, neurodegeneration, and COPD.
What is the role of catalase in GO:0016684?
Catalase decomposes hydrogen peroxide to water and oxygen, and can also act as a sulfide-sulfur oxidoreductase.
How does Erv1 relate to GO:0016684?
Erv1 is a sulfhydryl oxidase that uses peroxide as an electron acceptor to form disulfide bonds during mitochondrial protein import.
Can CRISPR be used to study GO:0016684?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable functional dissection of these enzymes.
What diseases are linked to peroxide-accepting oxidoreductases?
Cancer, neurodegeneration, COPD, atherosclerosis, and thyroid disorders.
What services does EDITGENE offer for GO:0016684 research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics for redox biology.
Conclusion
GO:0016684, oxidoreductase activity acting on peroxide as acceptor, is a fundamental molecular function that protects cells from oxidative damage and regulates redox signaling. Its enzymes are implicated in cancer, neurodegeneration, and COPD, making them important therapeutic targets. CRISPR-based models from EDITGENE enable precise functional studies to accelerate discovery in this field.
References
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- 3. Bai T et al.. 2024. A systematical strategy for quality markers screening of different methods processing Platycodonis radix based on phytochemical analysis and the impact on Chronic Obstructive Pulmonary Disease.. J Ethnopharmacol 319(Pt 2):117311 PMID: 37827295
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- 5. Heywood SP et al.. 1995. Development and application of a fluorometric assay for mammalian membrane dipeptidase.. Anal Biochem 226(1):10-4 PMID: 7785760
- 6. Olson KR et al.. 2017. Catalase as a sulfide-sulfur oxido-reductase: An ancient (and modern?) regulator of reactive sulfur species (RSS).. Redox Biol 12:325-339 PMID: 28285261
- 7. Swaisgood HE et al.. 1979. Sulphydryl oxidase: oxidation of sulphydryl groups and the formation of three-dimensional structure in proteins.. Ciba Found Symp PMID: 398763
- 8. Shepherd M et al.. 2009. Peroxidase activity of cytochrome C facilitates the protoporphyrinogen oxidase reaction.. Cell Mol Biol (Noisy-le-grand) 55(1):6-14 PMID: 19267995
