GO:0070430 positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway: Immune Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070430 describes any process that activates or increases the frequency, rate, or extent of NOD1 signaling, a cytosolic innate immune pathway that detects bacterial peptidoglycan fragments.
• NOD1 signaling is initiated by sensing iE-DAP-containing muramyl peptides, leading to RIPK2-dependent NF-kB and MAPK activation and pro-inflammatory cytokine production.
• Positive regulation of NOD1 signaling is implicated in cancer immune resistance, where NOD1/2 signaling in macrophages drives adaptive immune resistance.
• NOD1 signaling intersects with inflammasome pathways, and redox regulation of NLRs modulates inflammasome activity.
• Dysregulated NOD1 signaling contributes to inflammatory diseases including atherosclerosis and rheumatoid arthritis.
• CRISPR knockout, knock-in, and overexpression models are essential to dissect positive regulators of NOD1 signaling in immune and epithelial cells.
Description
The nucleotide-binding oligomerization domain containing 1 (NOD1) signaling pathway is a cytosolic innate immune sensing cascade that detects bacterial peptidoglycan fragments and initiates inflammatory responses. GO:0070430, positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway, encompasses any process that activates or increases the frequency, rate, or extent of this pathway. Understanding positive regulation of NOD1 signaling is critical because this pathway bridges microbial detection to adaptive immunity and has been implicated in cancer immune resistance. Recent studies have shown that NOD1/2 signaling in macrophages drives adaptive immune resistance in cancer, highlighting the therapeutic potential of targeting positive regulators of this pathway. Moreover, NOD1 signaling is modulated by redox-sensitive mechanisms and interacts with inflammasome components, expanding its relevance to inflammatory diseases. This article synthesizes current knowledge on the positive regulation of NOD1 signaling, covering its molecular mechanism, key genes, disease associations, and research methodologies including CRISPR-based models.
positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway At A Glance
| GO ID | GO:0070430 |
|---|---|
| GO term | positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway |
| Ontology | biological_process |
| Synonym | positive regulation of NOD1 signaling pathway |
| Major function | Activation or enhancement of NOD1-mediated innate immune signaling |
| Pathway | NOD1-RIPK2-NF-kB/MAPK cascade |
| Key ligand | iE-DAP-containing peptidoglycan fragments |
| Disease relevance | Cancer immune resistance, atherosclerosis, rheumatoid arthritis |
What Is GO:0070430?
GO:0070430 is defined as any process that activates or increases the frequency, rate, or extent of the nucleotide-binding oligomerization domain containing 1 (NOD1) signaling pathway. In other words, it includes all molecular events that positively regulate the cascade triggered by NOD1 activation, such as enhanced ligand sensing, increased RIPK2 ubiquitination, or amplified downstream NF-kB and MAPK signaling.
Why Is positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway Important in Cell Biology?
Positive regulation of NOD1 signaling is crucial for host defense against bacterial pathogens and for shaping adaptive immune responses. Dysregulation of this pathway contributes to chronic inflammatory diseases and cancer immune resistance, making its positive regulators attractive therapeutic targets. Understanding how NOD1 signaling is amplified can inform vaccine adjuvant design and immunotherapy strategies.
• NOD1 signaling is a key cytosolic sensor of bacterial peptidoglycan, essential for innate immune defense.
• Positive regulation of NOD1 signaling amplifies NF-kB and MAPK activation, driving pro-inflammatory cytokine production.
• NOD1/2 signaling in macrophages promotes adaptive immune resistance in cancer, limiting immunotherapy efficacy.
• Redox regulation of NLRs modulates inflammasome activity, linking oxidative stress to NOD1 pathway regulation.
• NOD1 signaling is implicated in atherosclerosis through endothelial inflammasome regulation.
• Rheumatoid arthritis involves ERAP2-mediated regulation of CD4+ T cell pyroptosis, potentially intersecting with NOD1 signaling.
• NOD-like receptors in fish are being targeted for aquaculture vaccine adjuvants, highlighting evolutionary conservation.
• Intermittent fasting modulates SIRT-1/NRF2/P38 MAPK/NLRP3 pathways, suggesting metabolic regulation of NOD-like receptor signaling.
• NOD2, a close homolog, is a major pathogenic mediator in Coxsackievirus B3-induced myocarditis, indicating related pathways in cardiac disease.
• CRISPR screening can identify novel positive regulators of NOD1 signaling for therapeutic targeting.
What Happens During positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway?
Ligand sensing and NOD1 activation
In simple terms: NOD1 detects bacterial cell wall fragments inside the cell, which turns on the immune alarm.
NOD1 is a cytosolic pattern recognition receptor that senses iE-DAP-containing peptidoglycan fragments from Gram-negative bacteria. Upon ligand binding, NOD1 undergoes oligomerization and recruits the adaptor kinase RIPK2, initiating downstream signaling. Positive regulation of this step can occur through increased NOD1 expression or enhanced ligand availability.
RIPK2 ubiquitination and signaling complex assembly
In simple terms: After NOD1 activation, a protein called RIPK2 gets tagged with ubiquitin chains to build a signaling platform.
RIPK2 is a central kinase in NOD1 signaling that undergoes K63-linked polyubiquitination, leading to recruitment of TAK1 and IKK complexes. Positive regulators of NOD1 signaling often enhance RIPK2 ubiquitination or stabilize the signaling complex. This step is critical for amplifying the downstream inflammatory response.
NF-kB and MAPK activation
In simple terms: The signal then activates master switches NF-kB and MAPKs, which turn on inflammatory genes.
NOD1 signaling activates NF-kB and MAPK pathways, leading to transcription of pro-inflammatory cytokines and chemokines. Positive regulation of NOD1 signaling increases the magnitude and duration of NF-kB and MAPK activation. This amplification is essential for effective pathogen clearance but can contribute to chronic inflammation if dysregulated.
Crosstalk with inflammasome and redox pathways
In simple terms: NOD1 signaling talks to other immune sensors and is influenced by the cell's oxidative state.
NOD1 signaling intersects with inflammasome pathways, and redox regulation of NLRs modulates inflammasome activity. Positive regulation of NOD1 signaling can be influenced by reactive oxygen species and antioxidant systems. This crosstalk amplifies inflammatory responses and links NOD1 to diseases like atherosclerosis.
Modulation by metabolic and hormonal factors
In simple terms: Metabolic states like fasting can affect NOD-like receptor signaling through stress-response pathways.
Intermittent fasting restores fertility dysfunction caused by a high-fat diet in male rats through SIRT-1/NRF2/P38 MAPK/NLRP3 pathways, indicating metabolic regulation of NOD-like receptor signaling. These findings suggest that positive regulation of NOD1 signaling may be modulated by metabolic and hormonal factors.
Key Genes Involved in GO:0070430 positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway
The following genes and proteins are central to the positive regulation of NOD1 signaling, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NOD1 | Cytosolic receptor for iE-DAP; initiates signaling | Core sensor; knockout models abolish pathway activation |
| RIPK2 | Adaptor kinase; mediates NF-kB and MAPK activation | Key node for positive regulation; ubiquitination targets |
| TAK1 | Kinase downstream of RIPK2; activates IKK | Amplifies NF-kB signaling; potential drug target |
| IKK complex | Phosphorylates IkB; releases NF-kB | Central to inflammatory gene transcription |
| NF-kB | Transcription factor; drives cytokine expression | Readout of NOD1 pathway activation |
| MAPK (p38, JNK, ERK) | Kinases; regulate inflammatory gene expression | Positive regulators of NOD1-induced inflammation |
| NLRP3 | Inflammasome sensor; crosstalk with NOD1 | Modulated by redox pathways; disease relevance |
| SIRT-1 | Deacetylase; metabolic regulator | Modulates NOD-like receptor signaling via NRF2 |
| NRF2 | Antioxidant transcription factor | Redox regulation of inflammasome and NOD1 crosstalk |
| ERAP2 | Aminopeptidase; regulates antigen presentation | Linked to CD4+ T cell pyroptosis in rheumatoid arthritis |
| Mer tyrosine kinase | Receptor kinase; efferocytosis | Suppressed by YY1/NEDD4L axis; linked to pyroptosis |
| YY1 | Transcription factor | Regulates NEDD4L and Mer tyrosine kinase in atherosclerosis |
| NEDD4L | E3 ubiquitin ligase | Targets Mer tyrosine kinase; affects efferocytosis |
| NOD2 | Homolog of NOD1; senses muramyl dipeptide | Pathogenic mediator in viral myocarditis |
| NLRP3 inflammasome | Multiprotein complex; activates caspase-1 | Redox-regulated; crosstalk with NOD1 |
| Caspase-1 | Protease; cleaves IL-1beta and IL-18 | Effector of inflammasome; downstream of NOD1 crosstalk |
| IL-1beta | Pro-inflammatory cytokine | Readout of NOD1 and inflammasome activation |
| IL-18 | Pro-inflammatory cytokine | Readout of inflammasome activation |
How Is positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway Regulated?
Positive regulation of NOD1 signaling is controlled at multiple levels. Redox regulation of NLRs modulates inflammasome activity, with reactive oxygen species influencing NOD1 pathway activation. Metabolic factors such as intermittent fasting can alter SIRT-1/NRF2/P38 MAPK/NLRP3 signaling, indirectly affecting NOD-like receptor pathways. Additionally, ERAP2 regulates CD4+ T cell pyroptosis in rheumatoid arthritis, suggesting a role in modulating NOD1-related inflammatory responses. The YY1/NEDD4L axis suppresses Mer tyrosine kinase-mediated macrophage efferocytosis, exacerbating atherosclerosis via pyroptosis, which may intersect with NOD1 signaling.
positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NOD1 | Cancer immune resistance | NOD1 knockout macrophages in tumor co-culture |
| NLRP3 | Atherosclerosis | Endothelial cell-specific NLRP3 knockout mice |
| ERAP2 | Rheumatoid arthritis | ERAP2 knockout CD4+ T cells |
| NOD2 | Coxsackievirus B3-induced myocarditis | NOD2 knockout mice infected with CVB3 |
| YY1/NEDD4L | Atherosclerosis | Macrophage-specific knockout of YY1 or NEDD4L |
Cancer immune resistance
NOD1/2 signaling in macrophages drives adaptive immune resistance in cancer, limiting the efficacy of immunotherapies. Positive regulation of NOD1 signaling in the tumor microenvironment promotes an immunosuppressive phenotype, making it a potential target for combination therapies.
Atherosclerosis
Endothelial NLRP3 inflammasome regulation is critical in atherosclerosis, and NOD1 signaling crosstalk with inflammasomes may contribute to plaque formation. The YY1/NEDD4L axis suppresses Mer tyrosine kinase-mediated macrophage efferocytosis, exacerbating atherosclerosis via pyroptosis, highlighting the interplay between NOD1-related pathways and vascular disease.
Rheumatoid arthritis
ERAP2 regulates CD4+ T cell pyroptosis in rheumatoid arthritis, suggesting that NOD1 signaling and related inflammasome pathways contribute to autoimmune joint destruction. Positive regulators of NOD1 signaling may represent therapeutic targets in RA.
Myocarditis
NOD2, a close homolog of NOD1, is a major pathogenic mediator of Coxsackievirus B3-induced myocarditis, indicating that related NOD-like receptor pathways are involved in cardiac inflammation. Positive regulation of NOD1 signaling may similarly contribute to viral myocarditis.
From positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does NOD1 positively regulate inflammatory cytokine production? | NOD1 knockout THP-1 cells |
| What is the role of RIPK2 ubiquitination in NOD1 signaling? | RIPK2 knock-in with ubiquitination-deficient mutations |
| How does ERAP2 modulate NOD1-related pyroptosis? | ERAP2 knockout CD4+ T cells |
| Does NLRP3 crosstalk with NOD1 in atherosclerosis? | NLRP3 knockout endothelial cells |
| Can overexpression of NOD1 enhance immune resistance in cancer? | NOD1 overexpression in macrophages |
| What is the effect of metabolic regulators on NOD1 signaling? | SIRT-1 knockout or overexpression models |
How to Study the positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Loss-of-function effects on NOD1 signaling | Identify positive regulators |
| RNA-seq | Transcriptional changes | Measure inflammatory gene expression |
| Proteomics | Protein interactions and modifications | Map RIPK2 ubiquitination |
| NF-kB luciferase reporter | NF-kB activation | High-throughput screening |
| Immunoblotting | Protein phosphorylation and degradation | Validate signaling activation |
| ELISA | Cytokine secretion | Measure IL-1beta and IL-18 |
| Flow cytometry | Immune cell phenotyping | Assess macrophage polarization |
| Confocal microscopy | Protein localization | Visualize NOD1 signaling complexes |
CRISPR knockout screening
Genome-wide CRISPR knockout screens can identify positive regulators of NOD1 signaling by selecting for loss of NF-kB activation upon NOD1 stimulation. This approach has been used to uncover novel components of innate immune pathways.
RNA sequencing and transcriptomics
RNA-seq measures transcriptional changes downstream of NOD1 activation, revealing positive regulators that amplify inflammatory gene expression. Comparative transcriptomics between wild-type and knockout cells identifies pathway-specific signatures.
Proteomics and ubiquitinomics
Mass spectrometry-based proteomics can map ubiquitination events on RIPK2 and other signaling components, identifying positive regulators that enhance complex assembly. This method is critical for understanding post-translational regulation of NOD1 signaling.
Imaging and reporter assays
NF-kB luciferase reporter assays and fluorescence microscopy visualize NOD1 signaling activation and localization in live cells. These methods enable high-throughput screening for positive regulators.
How CRISPR Can Be Used to Study GO:0070430 positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway
Knockout
CRISPR knockout of NOD1, RIPK2, or downstream effectors abolishes NOD1 signaling, providing a clean background to study positive regulators. Knockout models are essential for validating candidate genes identified in screens.
Point Mutation
Point mutations can be introduced into RIPK2 ubiquitination sites or NOD1 ligand-binding residues to dissect their roles in positive regulation. These models help distinguish between activation and amplification mechanisms.
Knock-in
Knock-in of tagged NOD1 or RIPK2 allows for affinity purification and proteomic analysis of signaling complexes. This approach identifies novel interacting partners that positively regulate the pathway.
Overexpression
Overexpression of NOD1 or positive regulators enhances pathway activation and can model chronic inflammation or cancer immune resistance. These models are useful for gain-of-function studies.
How EDITGENE Supports positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway Research
Researchers studying positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway-related genes often need to determine whether a candidate gene is causally involved in pathway activation or amplification. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway research.
Frequently Asked Questions About positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway
What is GO:0070430?
GO:0070430 is the Gene Ontology term for positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway, describing processes that activate or increase NOD1 signaling.
What genes are involved in positive regulation of NOD1 signaling?
Key genes include NOD1, RIPK2, TAK1, IKK, NF-kB, MAPKs, and crosstalk components like NLRP3.
How is NOD1 signaling activated?
NOD1 is activated by iE-DAP-containing peptidoglycan fragments, leading to RIPK2 recruitment and NF-kB/MAPK activation.
What diseases are associated with NOD1 signaling?
NOD1 signaling is linked to cancer immune resistance, atherosclerosis, rheumatoid arthritis, and myocarditis.
What is the role of NOD1 in cancer?
NOD1/2 signaling in macrophages drives adaptive immune resistance in cancer, limiting immunotherapy efficacy.
How can I study positive regulators of NOD1 signaling?
CRISPR knockout screens, RNA-seq, proteomics, and reporter assays are commonly used.
What is the difference between NOD1 and NOD2?
NOD1 senses iE-DAP, while NOD2 senses muramyl dipeptide; both activate RIPK2 and NF-kB.
Is NOD1 signaling regulated by redox?
Yes, redox regulation of NLRs modulates inflammasome activity and NOD1 crosstalk.
What model systems are used to study NOD1 signaling?
THP-1 macrophages, knockout mice, and CRISPR-engineered cell lines are commonly used.
How does EDITGENE support NOD1 research?
EDITGENE offers CRISPR knockout, knock-in, point mutation, overexpression, library screening, and bioinformatics services.
Conclusion
Positive regulation of NOD1 signaling (GO:0070430) is a critical biological process that amplifies innate immune responses to bacterial peptidoglycan and shapes adaptive immunity. Its dysregulation contributes to cancer immune resistance, atherosclerosis, and autoimmune diseases, making it a promising therapeutic target. Advances in CRISPR-based models and multi-omics approaches will continue to uncover novel positive regulators and their mechanisms.
References
- 1. Guo S et al.. 2024. Endothelial nucleotide-binding oligomerization domain-like receptor protein 3 inflammasome regulation in atherosclerosis.. Cardiovasc Res 120(8):883-898 PMID: 38626254
- 2. Ferrara F et al.. 2023. Redox Regulation of Nucleotide-Binding and Oligomerization Domain-Like Receptors Inflammasome.. Antioxid Redox Signal 39(10-12):744-770 PMID: 37440315
- 3. Tschöpe C et al.. 2017. NOD2 (Nucleotide-Binding Oligomerization Domain 2) Is a Major Pathogenic Mediator of Coxsackievirus B3-Induced Myocarditis.. Circ Heart Fail 10(9) PMID: 28912259
- 4. Zhang J et al.. 2024. Endoplasmic reticulum aminopeptidase 2 regulates CD4(+) T cells pyroptosis in rheumatoid arthritis.. Arthritis Res Ther 26(1):36 PMID: 38273310
- 5. Liu Q et al.. 2026. Yin-Yang 1/Neural Precursor Cell-Expressed Developmentally Downregulated 4-Like Axis Suppresses Mer Tyrosine Kinase-Mediated Macrophage Efferocytosis to Exacerbate Atherosclerosis Via Triggering Pyroptosis.. J Am Heart Assoc 15(1):e039855 PMID: 41467377
- 6. Wei X et al.. 2026. NOD1/2 signaling in macrophages drives adaptive immune resistance in cancer.. Signal Transduct Target Ther 11(1) PMID: 42476973
- 7. Swain B et al.. 2025. NOD-like receptors in fish: evolution, structure, immune signaling, and targeting for aquaculture vaccine adjuvants.. Front Immunol 16:1665071 PMID: 40963628
- 8. Hemead DA et al.. 2025. Intermittent fasting restores fertility dysfunction caused by a high-fat diet in male rats: role of SIRT-1/NRF2/P38 MAPK/NLRP3.. Reprod Fertil Dev 37 PMID: 40977219
