GO:0045019 negative regulation of nitric oxide biosynthetic process: Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045019 describes any process that stops, prevents, or reduces the frequency, rate or extent of nitric oxide (NO) biosynthesis.
• NO is produced by nitric oxide synthase (NOS) isoforms, and its biosynthesis is controlled at transcriptional, post-transcriptional, and protein-protein interaction levels.
• Negative regulation of NO biosynthesis is critical in cardiovascular, renal, and neuronal physiology, and its dysregulation contributes to disease.
• Key mechanisms include direct NOS inhibition by interacting proteins such as caveolin-1 and NOSIP, and modulation by beta 3-adrenoreceptors.
• In plants, S-nitrosoglutathione reductase (GSNOR) regulates NO homeostasis and affects development and stress responses.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal dissection of genes controlling NO biosynthesis.
Description
Nitric oxide (NO) is a gaseous signaling molecule involved in diverse physiological processes, including vasodilation, neurotransmission, and immune defense. The biosynthesis of NO is tightly controlled to prevent toxicity and maintain homeostasis. GO:0045019, negative regulation of nitric oxide biosynthetic process, encompasses any mechanism that reduces the production of NO. This regulation occurs at multiple levels, from transcriptional control of NOS genes to post-translational modifications and protein-protein interactions that inhibit NOS activity. Understanding how NO biosynthesis is negatively regulated is essential for researchers studying cardiovascular disease, neurodegeneration, and plant stress responses. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a comprehensive overview of GO:0045019, its molecular players, and experimental approaches.
negative regulation of nitric oxide biosynthetic process At A Glance
| GO ID | GO:0045019 |
|---|---|
| GO term | negative regulation of nitric oxide biosynthetic process |
| Ontology | biological_process |
| Synonym | down regulation of nitric oxide biosynthetic process; inhibition of nitric oxide biosynthetic process; negative regulation of nitric oxide formation |
| Major function | Reduction of nitric oxide production by inhibiting NOS expression, activity, or substrate availability |
| Related processes | Regulation of endothelial NOS (eNOS) activity, neuronal NOS (nNOS) regulation, inducible NOS (iNOS) suppression |
| Key regulators | Caveolin-1, NOSIP, beta 3-adrenoreceptor, GSNOR (in plants) |
| Disease relevance | Cardiovascular disease, hypertension, neurodegeneration, cancer |
What Is GO:0045019?
GO:0045019, negative regulation of nitric oxide biosynthetic process, is defined as any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of nitric oxide. This biological process includes mechanisms that inhibit the expression or activity of nitric oxide synthases (NOS), the enzymes responsible for NO production, as well as pathways that deplete substrates or cofactors required for NO synthesis.
Why Is negative regulation of nitric oxide biosynthetic process Important in Cell Biology?
Negative regulation of NO biosynthesis is crucial for preventing excessive NO production, which can lead to nitrosative stress, mitochondrial dysfunction, and tissue damage. In the cardiovascular system, proper control of NO levels maintains vascular tone and prevents hypertension. In the brain, dysregulated NO biosynthesis contributes to neurodegeneration. In plants, NO homeostasis is essential for development and stress responses. Thus, understanding GO:0045019 provides insights into fundamental physiology and disease mechanisms.
• Prevents nitrosative stress and cellular damage from excess NO.
• Maintains vascular homeostasis and blood pressure regulation.
• Modulates neurotransmission and neurotoxicity.
• Influences immune responses and inflammation.
• Regulates mitochondrial respiration and energy metabolism.
• Controls plant development and stress tolerance.
• Implicated in cardiovascular diseases such as hypertension and heart failure.
• Potential therapeutic target for cancer and neurodegenerative disorders.
• Key for understanding drug effects on NO signaling.
• Provides mechanistic insights for CRISPR-based gene editing studies.
What Happens During negative regulation of nitric oxide biosynthetic process?
Inhibition of NOS enzyme activity by protein-protein interactions
In simple terms: Proteins can bind to NOS enzymes and block their ability to produce nitric oxide.
Negative regulation of NO biosynthesis often occurs through direct protein-protein interactions that inhibit NOS activity. For example, caveolin-1 binds to endothelial NOS (eNOS) and inhibits its catalytic activity, reducing NO production. Similarly, NOSIP (NOS-interacting protein) promotes ubiquitination and degradation of eNOS, thereby decreasing NO synthesis. These interactions provide rapid and reversible control of NO levels in response to cellular signals.
Transcriptional and post-transcriptional suppression of NOS expression
In simple terms: Cells can reduce the amount of NOS enzyme by turning down gene expression or degrading mRNA.
The biosynthesis of NO can be negatively regulated by reducing the expression of NOS genes. Transcriptional repressors and microRNAs can downregulate NOS mRNA levels. Additionally, post-transcriptional mechanisms such as mRNA destabilization and translational inhibition contribute to lower NOS protein levels, ultimately decreasing NO production. In neurons, NO itself can regulate transcription factors, creating feedback loops that modulate NOS expression.
Regulation by beta 3-adrenoreceptors in the cardiovascular system
In simple terms: Beta 3-adrenoreceptors can decrease nitric oxide production in the heart and blood vessels.
In the cardiovascular system, beta 3-adrenoreceptor activation has been shown to negatively regulate NO biosynthesis. This regulation involves modulation of NOS activity and expression, contributing to the control of cardiac contractility and vascular tone. Dysregulation of this pathway is implicated in heart failure and hypertension.
NO homeostasis in plants via GSNOR
In simple terms: In plants, an enzyme called GSNOR breaks down a NO-related molecule, helping to control NO levels.
In Arabidopsis, S-nitrosoglutathione reductase (GSNOR) regulates NO homeostasis by metabolizing S-nitrosoglutathione, a major NO reservoir. Loss of GSNOR function leads to increased NO levels and affects multiple developmental programs. This demonstrates that negative regulation of NO biosynthesis is conserved across kingdoms and is essential for plant growth and stress responses.
Key Genes Involved in GO:0045019 negative regulation of nitric oxide biosynthetic process
The following genes and proteins are key players in the negative regulation of nitric oxide biosynthetic process, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NOS3 (eNOS) | Endothelial nitric oxide synthase; produces NO in vasculature | Target of negative regulation by caveolin-1 and NOSIP |
| CAV1 | Caveolin-1; inhibits eNOS activity via direct binding | Key negative regulator of NO biosynthesis in endothelial cells |
| NOSIP | NOS-interacting protein; promotes eNOS degradation | Mediates ubiquitin-proteasome-dependent downregulation of eNOS |
| ADRB3 | Beta 3-adrenoreceptor; modulates NO production in heart | Negatively regulates NO biosynthesis in cardiovascular system |
| GSNOR | S-nitrosoglutathione reductase; controls NO homeostasis in plants | Regulates NO levels and developmental programs in Arabidopsis |
| NOS1 (nNOS) | Neuronal nitric oxide synthase; produces NO in neurons | Regulated by transcription factors and feedback mechanisms |
| NOS2 (iNOS) | Inducible nitric oxide synthase; produces NO in inflammation | Negatively regulated by anti-inflammatory signals |
| PTGS2 (COX-2) | Cyclooxygenase-2; regulated by NO, involved in inflammation | NO regulates COX-2 expression, linking NO biosynthesis to prostaglandin pathways |
| HIF1A | Hypoxia-inducible factor 1-alpha; regulates NOS expression | Modulates NO biosynthesis under hypoxia |
| NFKB1 | Nuclear factor kappa-B; regulates iNOS transcription | Key transcription factor controlling iNOS expression |
| STAT1 | Signal transducer and activator of transcription 1; regulates iNOS | Involved in cytokine-induced iNOS expression |
| PIK3CA | Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha; activates Akt | Akt pathway regulates eNOS activity |
| AKT1 | AKT serine/threonine kinase 1; phosphorylates eNOS | Phosphorylation modulates eNOS activity and NO production |
| HSP90 | Heat shock protein 90; facilitates eNOS activation | Chaperone that modulates eNOS activity |
| CALM1 | Calmodulin; activates NOS by calcium binding | Calcium-calmodulin complex regulates NOS activity |
| ARG1 | Arginase 1; competes with NOS for L-arginine | Reduces substrate availability for NO synthesis |
| DDAH1 | Dimethylarginine dimethylaminohydrolase 1; degrades ADMA | Regulates endogenous NOS inhibitors |
| PRMT1 | Protein arginine methyltransferase 1; methylates NOS | Methylation inhibits NOS activity |
How Is negative regulation of nitric oxide biosynthetic process Regulated?
The negative regulation of NO biosynthesis is itself regulated by various signaling pathways. For instance, the PI3K/Akt pathway can phosphorylate eNOS, either activating or inhibiting its activity depending on the site. Calcium-calmodulin signaling controls NOS activity, and proteins like caveolin-1 provide inhibitory tone. In the kidney, hormonal factors and renal nerves regulate NOS expression and activity. In plants, GSNOR expression is modulated by developmental and stress signals.
negative regulation of nitric oxide biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NOS3 | Hypertension, atherosclerosis | Endothelial cell knockout of NOS3 or CAV1 |
| ADRB3 | Heart failure, obesity | Cardiomyocyte-specific ADRB3 overexpression |
| NOS2 | Inflammation, cancer | Macrophage knockout of NOS2 |
| GSNOR | Plant development, stress tolerance | Arabidopsis gsnor mutant |
| NOS1 | Neurodegeneration | Neuronal NOS1 knockout mice |
Cardiovascular disease
Dysregulation of NO biosynthesis is a hallmark of cardiovascular diseases such as hypertension, atherosclerosis, and heart failure. Negative regulation of NO biosynthesis by beta 3-adrenoreceptors and caveolin-1 is critical for maintaining vascular tone. Loss of this regulation can lead to endothelial dysfunction and disease progression.
Neurodegeneration
In the brain, excessive NO production contributes to neurotoxicity and neurodegeneration. Negative regulation of neuronal NOS (nNOS) is essential to prevent excitotoxicity. Transcription factors regulated by NO create feedback loops that can either protect or damage neurons.
Inflammation and cancer
Inducible NOS (iNOS) produces large amounts of NO during inflammation, which can promote tumorigenesis. Negative regulation of iNOS expression by anti-inflammatory signals is crucial to limit chronic inflammation and cancer risk. NO also regulates COX-2 expression, linking NO biosynthesis to prostaglandin pathways in cancer.
Plant stress responses
In plants, NO is involved in responses to heavy metal stress such as chromium toxicity. Negative regulation of NO biosynthesis via GSNOR helps plants tolerate stress and maintain development.
From negative regulation of nitric oxide biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does caveolin-1 inhibit eNOS in vivo? | CAV1 knockout mice or endothelial-specific knockout |
| What is the role of NOSIP in eNOS degradation? | NOSIP overexpression or knockout cell lines |
| How does beta 3-adrenoreceptor regulate NO in heart? | ADRB3 knockout or transgenic mice |
| Does GSNOR control NO homeostasis in plants? | Arabidopsis gsnor knockout |
| How does NO regulate COX-2 expression? | COX-2 promoter reporter assays with NO donors |
| What is the effect of NOS1 mutation on neurodegeneration? | Knock-in mice with point mutations in NOS1 |
How to Study the negative regulation of nitric oxide biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Griess assay | Nitrite/nitrate levels | Quantifying NO production in cell culture |
| Western blot | Protein expression and phosphorylation | Detecting NOS isoforms and modifications |
| Co-immunoprecipitation | Protein-protein interactions | Validating caveolin-1/eNOS binding |
| qRT-PCR | mRNA expression | Measuring NOS gene transcription |
| CRISPR knockout screen | Gene function on NO production | Identifying negative regulators of NO biosynthesis |
| Fluorescent NO probes | Real-time NO levels | Live-cell imaging of NO dynamics |
| Enzymatic activity assay | NOS catalytic activity | Measuring NOS activity in tissue lysates |
| Proximity ligation assay | In situ protein interactions | Visualizing NOS-regulator complexes |
Measuring NO production
Nitric oxide production can be measured using Griess assay, chemiluminescence, or fluorescent probes such as DAF-FM. These methods quantify nitrite/nitrate, the stable end products of NO metabolism, providing an index of NOS activity.
Assessing NOS expression and activity
Western blotting, qRT-PCR, and enzymatic activity assays are used to measure NOS isoform expression and activity. Phosphorylation-specific antibodies can detect post-translational modifications that regulate NOS.
Protein-protein interaction studies
Co-immunoprecipitation, pull-down assays, and proximity ligation assays can identify and validate interactions between NOS and its negative regulators such as caveolin-1 and NOSIP.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify genes that negatively regulate NO biosynthesis. These screens use NO-responsive reporters or phenotypic readouts to uncover novel regulators.
How CRISPR Can Be Used to Study GO:0045019 negative regulation of nitric oxide biosynthetic process
Knockout
CRISPR knockout of negative regulators such as CAV1 or NOSIP can lead to increased NO production, confirming their inhibitory roles. Knockout of NOS genes themselves abolishes NO biosynthesis, providing a baseline for studying negative regulation.
Point Mutation
Point mutations can be introduced into NOS phosphorylation sites or interaction domains to dissect their role in negative regulation. For example, mutating the caveolin-1 binding site on eNOS can prevent inhibition.
Knock-in
Knock-in of tagged NOS or regulator proteins allows for affinity purification and interaction studies. Tagged knock-in models also enable real-time imaging of protein localization and dynamics.
Overexpression
Overexpression of negative regulators like NOSIP or caveolin-1 can reduce NO production, validating their function. Inducible overexpression systems allow temporal control of NO biosynthesis.
How EDITGENE Supports negative regulation of nitric oxide biosynthetic process Research
Researchers studying negative regulation of nitric oxide biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in controlling NO levels. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of nitric oxide biosynthetic process research.
Frequently Asked Questions About negative regulation of nitric oxide biosynthetic process
What is GO:0045019?
GO:0045019 is the Gene Ontology term for negative regulation of nitric oxide biosynthetic process, describing any mechanism that reduces the production of nitric oxide.
What genes are involved in negative regulation of nitric oxide biosynthetic process?
Key genes include CAV1, NOSIP, ADRB3, and GSNOR, which inhibit NOS activity or expression.
How is nitric oxide biosynthesis negatively regulated?
It is regulated by protein-protein interactions (e.g., caveolin-1 binding to eNOS), transcriptional repression, and post-translational modifications.
Why is negative regulation of NO biosynthesis important?
It prevents nitrosative stress, maintains vascular tone, and protects against neurodegeneration and inflammation.
What diseases are associated with dysregulated NO biosynthesis?
Cardiovascular disease, neurodegeneration, inflammation, and cancer are linked to impaired negative regulation of NO biosynthesis.
What methods are used to study negative regulation of NO biosynthesis?
Methods include Griess assay, Western blot, co-immunoprecipitation, and CRISPR screens.
How can CRISPR be used to study GO:0045019?
CRISPR knockout, point mutation, knock-in, and overexpression models can dissect the function of genes regulating NO biosynthesis.
What is the role of caveolin-1 in NO biosynthesis?
Caveolin-1 binds to eNOS and inhibits its activity, reducing NO production.
How does GSNOR regulate NO in plants?
GSNOR metabolizes S-nitrosoglutathione, controlling NO homeostasis and affecting plant development.
What are the research tools for NO detection?
Fluorescent probes, chemiluminescence, and the Griess assay are commonly used to measure NO levels.
Conclusion
GO:0045019, negative regulation of nitric oxide biosynthetic process, is a critical biological process that controls NO levels to prevent toxicity and maintain homeostasis. Key regulators such as caveolin-1, NOSIP, and GSNOR modulate NOS activity and expression across species. Dysregulation of this process contributes to cardiovascular disease, neurodegeneration, and cancer. CRISPR-based models offer powerful tools to dissect the causal roles of these regulators, and EDITGENE provides comprehensive services to support such research.
References
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- 3. Giulivi C et al.. 2006. Nitric oxide regulation of mitochondrial oxygen consumption I: cellular physiology.. Am J Physiol Cell Physiol 291(6):C1225-31 PMID: 16885394
- 4. Pérez-Sala D et al.. 2001. Regulation of cyclooxygenase-2 expression by nitric oxide in cells.. Antioxid Redox Signal 3(2):231-48 PMID: 11396478
- 5. Herrera M et al.. 2005. Recent advances in the regulation of nitric oxide in the kidney.. Hypertension 45(6):1062-7 PMID: 15753231
- 6. Moens AL et al.. 2010. Beta 3-adrenoreceptor regulation of nitric oxide in the cardiovascular system.. J Mol Cell Cardiol 48(6):1088-95 PMID: 20184889
- 7. Singh S et al.. 2023. Nitric oxide and hydrogen peroxide mediated regulation of chromium (VI) toxicity in wheat seedlings involves alterations in antioxidants and high affinity sulfate transporter.. Plant Sci 332:111697 PMID: 37023859
- 8. Kwon E et al.. 2012. AtGSNOR1 function is required for multiple developmental programs in Arabidopsis.. Planta 236(3):887-900 PMID: 22767201
