GO:1905004 picolinic acid biosynthetic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905004 (picolinic acid biosynthetic process) describes the chemical reactions and pathways that produce picolinic acid, a pyridine-2-carboxylic acid metabolite.
• Picolinic acid is a natural metabolite of the kynurenine pathway and has been detected in microbial, plant, and mammalian systems [2, 4].
• The biosynthetic route in fungi such as Epicoccum sorghinum involves a nonribosomal peptide synthetase-like gene cluster that converts L-lysine or L-tryptophan into picolinic acid derivatives.
• Picolinic acid modulates immune responses, including antagonism of macrophage inflammatory protein-1alpha/beta production and interaction with interferon-gamma [6, 8].
• Dysregulation of picolinic acid metabolism has been linked to inflammatory bowel disease (IBD) and other inflammation-associated conditions.
• CRISPR-based knockout, knock-in, and overexpression models are essential tools to dissect the genetic basis of picolinic acid biosynthesis and its physiological roles [2, 4].
Description
Picolinic acid (pyridine-2-carboxylic acid) is a small heterocyclic compound that participates in a range of biological processes, from microbial secondary metabolism to mammalian immune regulation [2, 8]. The Gene Ontology term GO:1905004, picolinic acid biosynthetic process, defines the set of chemical reactions and pathways that result in the formation of this metabolite. Understanding this process is important because picolinic acid has been implicated in host-microbe interactions, inflammatory signaling, and metal chelation [4, 6]. In fungi, the biosynthetic pathway has been linked to a dedicated gene cluster that produces picolinic acid derivatives, providing a tractable genetic system for functional studies. In mammals, picolinic acid is generated as a downstream metabolite of the kynurenine pathway, although the exact enzymatic steps remain an active area of research. The availability of CRISPR-based tools now allows researchers to systematically test the contribution of candidate genes to picolinic acid production and to explore its roles in health and disease [2, 4].
picolinic acid biosynthetic process At A Glance
| GO ID | GO:1905004 |
|---|---|
| GO term | picolinic acid biosynthetic process |
| Ontology | biological_process |
| Synonym | picolinate biosynthesis; picolinate biosynthetic process; picolinic acid anabolism; picolinic acid biosynthesis; picolinic acid formation; picolinic acid synthesis |
| Major function | Production of picolinic acid, a pyridine-2-carboxylic acid metabolite involved in immune modulation and metal chelation [2, 6] |
| Related pathways | Kynurenine pathway, microbial secondary metabolism, amino acid catabolism [2, 8] |
| Key organisms | Fungi (e.g., Epicoccum sorghinum), bacteria, mammals [2, 4] |
| Disease relevance | Inflammatory bowel disease, immune dysregulation, potential roles in cancer and neurodegeneration [4, 6] |
What Is GO:1905004?
GO:1905004, picolinic acid biosynthetic process, is defined as the chemical reactions and pathways resulting in the formation of picolinic acid. This biological process encompasses the enzymatic steps that convert precursor molecules into picolinic acid, including any intermediate modifications, and is distinct from catabolic or transport processes involving picolinic acid.
Why Is picolinic acid biosynthetic process Important in Cell Biology?
The picolinic acid biosynthetic process is important because picolinic acid is a bioactive metabolite that bridges microbial metabolism and host immunity [2, 8]. It has been shown to antagonize the production of macrophage inflammatory protein-1alpha/beta, suggesting a role in controlling inflammation. In clinical cohorts, picolinic acid levels have been associated with inflammatory bowel disease, highlighting its potential as a biomarker or therapeutic target. Moreover, the biosynthetic pathway in fungi involves specialized enzymes that could be harnessed for biotechnological production of picolinic acid derivatives. Understanding this process at the genetic and biochemical level is therefore relevant to immunology, microbiology, and drug discovery.
• Picolinic acid is a natural metabolite with immunomodulatory properties, including antagonism of MIP-1alpha/beta.
• It is produced via the kynurenine pathway in mammals, linking tryptophan metabolism to immune regulation.
• Microbial biosynthesis of picolinic acid derivatives involves nonribosomal peptide synthetase-like enzymes.
• Altered picolinic acid levels have been observed in inflammatory bowel disease cohorts.
• Picolinic acid can chelate metal ions, influencing enzyme activity and oxidative stress.
• The pathway is a potential target for anti-inflammatory and immunomodulatory therapies [6, 8].
• Fungal gene clusters for picolinic acid biosynthesis offer tools for synthetic biology.
• CRISPR screens can identify novel genes required for picolinic acid production [2, 4].
• Picolinic acid derivatives may serve as leads for drug development.
• Understanding the biosynthetic process can inform microbiome-based interventions.
What Happens During picolinic acid biosynthetic process?
Precursor supply and pathway entry
In simple terms: The cell first makes or imports the starting molecules that will be turned into picolinic acid.
In mammals, picolinic acid is derived from the kynurenine pathway, which begins with the oxidation of L-tryptophan. In fungi, the biosynthetic gene cluster for picolinic acid derivatives likely utilizes amino acid precursors such as L-lysine or L-tryptophan, based on the presence of nonribosomal peptide synthetase-like genes. The availability of these precursors is a key control point for the entire process.
Enzymatic conversion steps
In simple terms: A series of enzymes chemically modify the precursor to build the picolinic acid structure.
The conversion of precursors to picolinic acid involves multiple enzymatic reactions, including oxidation, decarboxylation, and cyclization steps. In Epicoccum sorghinum, the gene cluster responsible for picolinic acid derivative biosynthesis includes genes encoding a nonribosomal peptide synthetase, a cytochrome P450, and a decarboxylase, which act sequentially to form the pyridine ring. In mammals, the exact enzymes downstream of kynurenine that produce picolinic acid are not fully characterized, but the process is thought to involve spontaneous or enzymatic cyclization of an intermediate.
Regulation of pathway flux
In simple terms: The cell can speed up or slow down picolinic acid production depending on its needs.
The picolinic acid biosynthetic process is regulated at multiple levels. In immune cells, interferon-gamma stimulates the kynurenine pathway, thereby increasing picolinic acid production [6, 8]. In fungi, the expression of the biosynthetic gene cluster is likely controlled by pathway-specific transcription factors, although specific regulators have not been fully defined. Additionally, precursor availability and feedback inhibition by downstream metabolites may modulate flux through the pathway.
Export and downstream effects
In simple terms: Once made, picolinic acid can leave the cell or act inside it to influence other processes.
Picolinic acid can be secreted or retained intracellularly, where it exerts immunomodulatory effects. It has been shown to antagonize macrophage inflammatory protein-1alpha/beta production, potentially by interfering with cytokine signaling. In the gut, picolinic acid produced by the microbiome may influence host immune homeostasis, as suggested by its association with inflammatory bowel disease. The fate of picolinic acid after biosynthesis is an active area of research.
Key Genes Involved in GO:1905004 picolinic acid biosynthetic process
The following genes and proteins have been implicated in the picolinic acid biosynthetic process or its regulation, based on published literature [2, 4, 6, 8].
| Gene | Major Role | Research Relevance |
|---|---|---|
| NRPS-like | Nonribosomal peptide synthetase-like enzyme; catalyzes key steps in picolinic acid derivative biosynthesis in fungi | Target for gene knockout to abolish picolinic acid production |
| P450 | Cytochrome P450 monooxygenase; likely involved in oxidative modifications during biosynthesis | Candidate for functional studies via point mutations |
| Decarboxylase | Catalyzes decarboxylation of intermediates in the pathway | Potential knockout target to block picolinic acid formation |
| IDO1 | Indoleamine 2,3-dioxygenase 1; initiates kynurenine pathway from tryptophan | Knockout models to study picolinic acid downstream effects |
| IDO2 | Indoleamine 2,3-dioxygenase 2; alternative initiator of kynurenine pathway | Overexpression models to boost picolinic acid flux |
| TDO2 | Tryptophan 2,3-dioxygenase; catalyzes first step of kynurenine pathway in liver | Tissue-specific knockout to dissect pathway contribution |
| KYNU | Kynureninase; converts kynurenine to anthranilate, a precursor of picolinic acid | Knock-in of tagged version for proteomics |
| HAAO | 3-hydroxyanthranilate 3,4-dioxygenase; involved in downstream kynurenine metabolism | Point mutation to alter enzyme activity |
| QPRT | Quinolinate phosphoribosyltransferase; competes with picolinic acid synthesis | Knockout to redirect flux toward picolinic acid |
| ACMSD | Aminocarboxymuconate semialdehyde decarboxylase; regulates kynurenine pathway flux | Overexpression to modulate picolinic acid levels |
| MIP-1alpha | Macrophage inflammatory protein-1alpha; its production is antagonized by picolinic acid | Reporter assays to measure picolinic acid activity |
| MIP-1beta | Macrophage inflammatory protein-1beta; also antagonized by picolinic acid | ELISA-based readout for picolinic acid effects |
| IFN-gamma | Interferon-gamma; stimulates kynurenine pathway and picolinic acid production | Knockout mice to study immune regulation |
| SLC7A11 | Cystine/glutamate antiporter; may influence precursor availability | CRISPR knockout to test metabolic crosstalk |
| GCLM | Glutamate-cysteine ligase modifier subunit; linked to oxidative stress and picolinic acid | Overexpression to study redox balance |
| NQO1 | NAD(P)H quinone dehydrogenase 1; potential downstream target of picolinic acid | Knock-in reporter for pathway activity |
| NFE2L2 | Nrf2; transcription factor regulating antioxidant response, potentially interacting with picolinic acid | Knockout to assess pathway crosstalk |
| IL-6 | Interleukin-6; inflammatory cytokine whose levels correlate with picolinic acid in IBD | Overexpression models to study inflammation |
How Is picolinic acid biosynthetic process Regulated?
The picolinic acid biosynthetic process is regulated by both transcriptional and metabolic mechanisms. In immune cells, interferon-gamma induces the expression of kynurenine pathway enzymes, thereby increasing flux toward picolinic acid [6, 8]. In fungi, the biosynthetic gene cluster is likely controlled by pathway-specific regulators, though these remain to be fully characterized. Additionally, precursor availability, feedback inhibition by downstream metabolites, and redox balance can modulate the pathway [4, 8]. The interplay between these regulatory layers ensures that picolinic acid production is tightly coupled to cellular demands.
picolinic acid biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IDO1 | Inflammatory bowel disease, cancer immune evasion [4, 8] | Knockout mice or cell lines to assess picolinic acid levels |
| IFN-gamma | Immune dysregulation, chronic inflammation | Overexpression or knockout in macrophage cell lines |
| MIP-1alpha | Inflammatory bowel disease, chemokine signaling [4, 6] | Reporter assays in CRISPR-edited cells |
| KYNU | Neurodegeneration, kynurenine pathway disorders | Point mutation knock-in to alter enzyme activity |
| NRPS-like | Fungal secondary metabolism, potential biotech applications | Knockout in Epicoccum sorghinum to abolish picolinic acid production |
Inflammatory bowel disease
Picolinic acid levels have been associated with inflammatory bowel disease (IBD) in a microbiome-metabolome study of an inception cohort. The metabolite may influence gut immune homeostasis, and its biosynthetic pathway could be a target for modulating inflammation. Further research using CRISPR models is needed to establish causality.
Immune dysregulation
Picolinic acid antagonizes the production of macrophage inflammatory protein-1alpha/beta, suggesting a role in controlling excessive inflammation. Dysregulation of this pathway may contribute to autoimmune or chronic inflammatory conditions [6, 8]. Interferon-gamma, a key immune regulator, stimulates picolinic acid production, linking it to Th1 immune responses.
Cancer and neurodegeneration
The kynurenine pathway, which produces picolinic acid, is implicated in cancer immune evasion and neurodegeneration. Picolinic acid may modulate these processes through its effects on immune cells and metal homeostasis [7, 8]. However, direct evidence linking picolinic acid biosynthesis to these diseases is still emerging.
From picolinic acid biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is gene X required for picolinic acid biosynthesis? | CRISPR knockout in fungal or mammalian cells followed by metabolite profiling |
| Does a specific point mutation alter enzyme activity? | CRISPR point mutation knock-in in candidate gene |
| Can we tag the enzyme for localization studies? | Knock-in of fluorescent or epitope tag |
| Does overexpression increase picolinic acid production? | CRISPR activation or cDNA overexpression |
| Which genes regulate the pathway in immune cells? | CRISPR library screening with picolinic acid readout |
| How does picolinic acid affect cytokine production? | Knockout of MIP-1alpha/beta in macrophages |
How to Study the picolinic acid biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS | Picolinic acid and metabolite levels | Quantifying pathway output in CRISPR-edited cells |
| CRISPR knockout screening | Gene essentiality for picolinic acid production | Identifying novel pathway genes [2, 4] |
| RNA-seq | Transcriptional changes | Mapping regulatory networks |
| Proteomics | Protein abundance and modifications | Validating enzyme expression |
| Reporter assays | Pathway activity in real time | High-throughput compound screening |
| Immunoassays (ELISA) | Cytokine levels (e.g., MIP-1alpha) | Measuring picolinic acid immunomodulation |
| Fluorescence microscopy | Subcellular localization of tagged enzymes | Determining organelle-specific biosynthesis |
| Metabolic flux analysis | Rate of picolinic acid synthesis | Assessing pathway dynamics |
Metabolomics and mass spectrometry
Targeted metabolomics using LC-MS/MS is the gold standard for quantifying picolinic acid and its precursors in biological samples [2, 4]. This method allows researchers to measure pathway flux and validate CRISPR edits.
CRISPR screening
Genome-wide CRISPR knockout or activation screens coupled with picolinic acid detection can identify novel genes regulating the biosynthetic process [2, 4]. Such screens are powerful for uncovering non-obvious pathway components.
Transcriptomics and proteomics
RNA-seq and proteomics can reveal changes in gene expression and protein abundance upon pathway perturbation [4, 8]. These approaches help define the regulatory network controlling picolinic acid biosynthesis.
Reporter assays and imaging
Fluorescent or luminescent reporters driven by pathway-responsive promoters can monitor picolinic acid production in live cells. Imaging of tagged enzymes allows subcellular localization studies.
How CRISPR Can Be Used to Study GO:1905004 picolinic acid biosynthetic process
Knockout
CRISPR knockout of candidate genes such as NRPS-like, P450, or decarboxylase in fungi can abolish picolinic acid production, providing direct evidence of their necessity. In mammalian cells, knockout of IDO1 or KYNU can reduce pathway flux.
Point Mutation
Introducing specific point mutations in catalytic residues of biosynthetic enzymes can reveal their mechanistic roles. For example, mutating the active site of a cytochrome P450 can test its involvement in oxidative steps.
Knock-in
Knock-in of epitope or fluorescent tags allows visualization and immunoprecipitation of pathway enzymes. This approach is useful for studying protein-protein interactions and localization.
Overexpression
CRISPR activation or cDNA overexpression of rate-limiting enzymes can boost picolinic acid production, enabling studies of its downstream effects [2, 8]. Overexpression models are also valuable for biotechnological production.
How EDITGENE Supports picolinic acid biosynthetic process Research
Researchers studying picolinic acid biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in metabolite production, immune modulation, or disease progression. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this research, from knockout to overexpression and library screening.
Contact EDITGENE today to design your custom CRISPR model for picolinic acid biosynthetic process research.
Frequently Asked Questions About picolinic acid biosynthetic process
What is picolinic acid biosynthetic process?
It is the biological process defined by GO:1905004 that encompasses the chemical reactions and pathways resulting in the formation of picolinic acid.
What genes are involved in picolinic acid biosynthetic process?
Key genes include NRPS-like, P450, and decarboxylase in fungi, and IDO1, IDO2, TDO2, KYNU, and HAAO in mammals [2, 8].
What is the GO ID for picolinic acid biosynthetic process?
The GO ID is GO:1905004.
How is picolinic acid produced in the body?
Picolinic acid is produced via the kynurenine pathway, which starts with tryptophan oxidation and involves several enzymatic steps.
What diseases are associated with picolinic acid?
Picolinic acid has been linked to inflammatory bowel disease and immune dysregulation, with potential roles in cancer and neurodegeneration [4, 6, 8].
Can CRISPR be used to study picolinic acid biosynthesis?
Yes, CRISPR knockout, knock-in, and overexpression models are powerful tools to dissect the genetic basis of picolinic acid production [2, 4].
What are the synonyms for picolinic acid biosynthetic process?
Synonyms include picolinate biosynthesis, picolinate biosynthetic process, picolinic acid anabolism, picolinic acid biosynthesis, picolinic acid formation, and picolinic acid synthesis.
Which organisms produce picolinic acid?
Picolinic acid is produced by fungi such as Epicoccum sorghinum, bacteria, and mammals [2, 4].
How does picolinic acid affect the immune system?
Picolinic acid antagonizes macrophage inflammatory protein-1alpha/beta production and is induced by interferon-gamma, suggesting an immunomodulatory role [6, 8].
What methods are used to study picolinic acid biosynthesis?
Common methods include LC-MS/MS metabolomics, CRISPR screening, RNA-seq, and reporter assays [2, 4, 6].
Conclusion
The picolinic acid biosynthetic process (GO:1905004) is a biologically significant pathway that produces a metabolite with diverse roles in immunity, microbial metabolism, and disease [2, 4, 6, 8]. Understanding its genetic and biochemical underpinnings is essential for developing therapeutic and biotechnological applications. CRISPR-based tools offer unprecedented opportunities to dissect this pathway and translate findings into clinical advances.
References
- 2. Chen L et al.. 2026. Picolinic Acid Derivatives and Biosynthetic Pathway from Epicoccum sorghinum SDU-F549.. J Nat Prod 89(1):329-335 PMID: 41481803
- 4. Radhakrishnan ST et al.. 2025. Deciphering the microbiome-metabolome landscape of an inflammatory bowel disease inception cohort.. Gut Microbes 17(1):2527863 PMID: 40679059
- 6. Rapisarda A et al.. 2002. Antagonistic effect of picolinic acid and interferon-gamma on macrophage inflammatory protein-1alpha/beta production.. Cell Immunol 220(1):70-80 PMID: 12718941
- 7. Kim J et al.. 2023. Picolinic Acid-Mediated Catalysis of Mn(II) for Peracetic Acid Oxidation Processes: Formation of High-Valent Mn Species.. Environ Sci Technol 57(47):18929-18939 PMID: 37224105
- 8. Melillo G et al.. 1996. Immunobiology of picolinic acid.. Adv Exp Med Biol 398:135-41 PMID: 8906256
