GO:0007167 enzyme-linked receptor protein signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0007167 describes signaling initiated by extracellular ligand binding to a cell-surface receptor that either has intrinsic catalytic activity or is tightly associated with an enzyme such as a protein kinase.
• Enzyme-linked receptors include receptor tyrosine kinases, cytokine receptor-associated kinases, and other catalytic or kinase-coupled receptors that convert extracellular cues into intracellular phosphorylation cascades.
• Dysregulation of enzyme-linked receptor signaling is implicated in inflammatory, metabolic, fibrotic, and malignant diseases, making it a major therapeutic target class.
• Key downstream modules include PI3K/AKT, NF-kB, and MAPK-related pathways that control transcription, metabolism, and cell survival.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of receptor and adaptor function in this pathway.
• Library screening and bioinformatics can identify pathway components and context-specific dependencies across disease models.
Description
GO:0007167, enzyme-linked receptor protein signaling pathway, is a biological process in which an extracellular ligand binds a cell-surface receptor that possesses catalytic activity or is closely associated with an enzyme such as a protein kinase, leading to regulation of downstream cellular processes including transcription. This term captures a broad class of signaling systems that includes receptor tyrosine kinases and cytokine receptors that recruit kinases, distinguishing them from G-protein-coupled or ion-channel receptors. Because these receptors directly couple ligand binding to enzymatic activity, they provide a fast and tunable mechanism for cells to respond to growth factors, cytokines, and metabolic cues. Researchers study GO:0007167 to understand how normal cells interpret extracellular signals and how these circuits are rewired in disease. For example, RAGE/NF-kB signaling downstream of ligand engagement contributes to neuroinflammation, and inhibition of this axis attenuates inflammatory responses in vivo and in vitro. Similarly, TLR9/NF-kB signaling regulates cytokine responses in human peripheral blood mononuclear cells, illustrating how enzyme-linked receptor pathways shape immune output. In metabolic and reproductive contexts, the EGFR/PI3K/AKT cascade is a central node in ovulation dysfunction and insulin resistance, and its regulation by pharmacological agents has been explored in polycystic ovary syndrome models. From a methods perspective, GO:0007167 is interrogated with receptor-ligand perturbation, phospho-signaling readouts, transcriptomics, and CRISPR-based genetic models. The pathway's breadth means that careful definition of the specific receptor, ligand, and downstream module is essential for reproducible research and for translating findings into therapeutic hypotheses.
enzyme-linked receptor protein signaling pathway At A Glance
| GO ID | GO:0007167 |
|---|---|
| GO term | enzyme-linked receptor protein signaling pathway |
| Ontology | biological_process |
| Synonym | enzyme linked receptor protein signaling pathway; enzyme linked receptor protein signalling pathway |
| Definition | The series of molecular signals initiated by an extracellular ligand binding to a receptor on the surface of the target cell, where the receptor possesses catalytic activity or is closely associated with an enzyme such as a protein kinase, and ending with the regulation of a downstream cellular process, e.g. transcription. |
| Major function | Transduces extracellular ligand cues into intracellular enzymatic cascades that regulate transcription, metabolism, survival, and immune responses. |
| Representative receptors | Receptor tyrosine kinases and cytokine receptors that recruit or associate with kinases such as JAK family members. |
| Downstream modules | PI3K/AKT, NF-kB, and MAPK-related signaling arms. |
| Disease relevance | Inflammation, metabolic disorders, fibrosis, and cancer-related signaling. |
What Is GO:0007167?
In our own words, GO:0007167 is the series of molecular events that begins when an extracellular ligand binds to a receptor on the surface of a target cell, where that receptor either has catalytic activity itself or is closely associated with an enzyme such as a protein kinase, and ends with regulation of a downstream cellular process, for example transcription. This definition emphasizes three features: an extracellular ligand, a membrane receptor with or without intrinsic enzymatic activity but coupled to an enzyme, and a downstream regulatory outcome.
Why Is enzyme-linked receptor protein signaling pathway Important in Cell Biology?
GO:0007167 matters because it defines how cells convert a vast array of extracellular ligands into specific transcriptional and metabolic programs, and because many clinically important drugs and experimental therapeutics target nodes within these pathways. Understanding the precise receptor-ligand pair and the downstream enzyme-coupled events is essential for interpreting disease mechanisms and for designing selective interventions.
• Provides a mechanistic framework for growth factor and cytokine signaling at the cell surface.
• Links extracellular cues to transcriptional regulation through kinase cascades.
• Central to inflammatory signaling, including RAGE/NF-kB and TLR9/NF-kB axes.
• Implicated in metabolic and reproductive disorders such as polycystic ovary syndrome through EGFR/PI3K/AKT signaling.
• Contributes to fibrotic remodeling, as shown for prostacyclin/PGI2-PTGIR signaling in intestinal fibrosis.
• Relevant to chemokine receptor biology and biased signaling mechanisms.
• Provides targets for CRISPR-based functional genomics and drug discovery.
• Supports biomarker and bioinformatics discovery through pathway-level analysis.
What Happens During enzyme-linked receptor protein signaling pathway?
Ligand binding and receptor activation
In simple terms: A signal molecule docks onto a receptor on the cell surface, switching the receptor on.
The pathway begins when an extracellular ligand binds to a cell-surface receptor that either has catalytic activity or is closely associated with an enzyme such as a protein kinase. This binding event triggers conformational changes or clustering that activate the receptor's enzymatic function or recruit associated kinases, initiating the signaling cascade.
Enzymatic relay and phosphorylation
In simple terms: The activated receptor acts like a switch that adds phosphate tags to downstream proteins.
Once activated, the receptor or its associated kinase phosphorylates downstream substrates, creating docking sites and propagating the signal. This enzymatic relay is a defining feature of GO:0007167 and distinguishes it from signaling modes that do not rely on catalytic receptors.
Downstream module engagement
In simple terms: The phosphate tags turn on specific cellular machines that control gene expression and metabolism.
Phosphorylation events engage downstream modules such as PI3K/AKT, NF-kB, and MAPK-related pathways. For example, RAGE/NF-kB signaling downstream of ligand engagement drives neuroinflammatory gene expression, and its inhibition reduces inflammatory responses. Similarly, TLR9/NF-kB signaling regulates cytokine production in human immune cells.
Transcriptional and cellular outcomes
In simple terms: The signal ultimately changes which genes are turned on or off, altering cell behavior.
The cascade ends with regulation of downstream cellular processes, including transcription. In metabolic contexts, EGFR/PI3K/AKT signaling influences ovulation and insulin sensitivity, and modulating this cascade can improve dysfunction in disease models. In fibrosis, prostacyclin/PGI2-PTGIR signaling alleviates intestinal fibrosis via fibroblast-specific YAP/TAZ inhibition, illustrating how enzyme-linked receptor pathways control tissue remodeling programs.
Key Genes Involved in GO:0007167 enzyme-linked receptor protein signaling pathway
The following genes and proteins represent major nodes within enzyme-linked receptor protein signaling pathways, based on the verified literature cited in this article.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EGFR | Receptor tyrosine kinase that activates PI3K/AKT signaling | Studied in polycystic ovary syndrome and metabolic dysfunction |
| PIK3CA | Catalytic subunit of PI3K downstream of receptor activation | Central to PI3K/AKT cascade regulation |
| AKT1 | Serine/threonine kinase mediating survival and metabolic signals | Key effector in EGFR/PI3K/AKT signaling |
| RAGE | Pattern-recognition receptor coupled to NF-kB signaling | Targeted to attenuate neuroinflammation |
| NFKB1 | Transcription factor downstream of RAGE and TLR signaling | Mediates inflammatory gene expression |
| TLR9 | Nucleic-acid-sensing receptor that engages NF-kB | Regulates cytokine responses in human PBMCs |
| TLR3 | Double-stranded RNA receptor linked to interferon and chemokine responses | Induces ISG54/ISG56 and CXCL10 in astrocytoma cells |
| CXCL10 | Chemokine induced downstream of TLR3 signaling | Marker of inflammatory signaling output |
| CCL5 | Chemokine implicated in ferroptosis and valve disease | Silencing suppresses ferroptosis in calcific aortic valve disease |
| PTGIR | Prostacyclin receptor coupled to downstream kinase signaling | Restoring signaling alleviates intestinal fibrosis |
| YAP1 | Transcriptional co-activator regulated downstream of PTGIR signaling | Fibroblast-specific inhibition reduces fibrosis |
| TAZ | Transcriptional co-activator with YAP1 in fibrosis | Target of PTGIR-mediated signaling |
| ISG54 | Interferon-stimulated gene induced by TLR3 signaling | Readout of TLR3 pathway activation |
| ISG56 | Interferon-stimulated gene induced by TLR3 signaling | Readout of TLR3 pathway activation |
| JAK family kinases | Cytokine receptor-associated kinases | General mediators of enzyme-linked receptor signaling |
| STAT transcription factors | Downstream effectors of JAK-coupled receptors | Regulate transcription in cytokine signaling |
| NF-kB complex | Central transcription factor node | Integrates RAGE and TLR signals |
How Is enzyme-linked receptor protein signaling pathway Regulated?
Enzyme-linked receptor protein signaling is regulated at multiple levels, including ligand availability, receptor abundance, kinase activity, and feedback phosphorylation. Downstream modules such as PI3K/AKT and NF-kB are subject to negative feedback and crosstalk that shape the duration and intensity of the signal. In disease contexts, pharmacological or genetic modulation of these regulatory nodes can restore normal signaling output, as shown for RAGE/NF-kB inhibition in neuroinflammation and for EGFR/PI3K/AKT regulation in metabolic dysfunction.
enzyme-linked receptor protein signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RAGE | Neuroinflammation | Knockout or point-mutation models with NF-kB readouts |
| TLR9 | Cytokine response in immune cells | Knockout in human PBMCs or cell lines |
| EGFR | Polycystic ovary syndrome and insulin resistance | Overexpression or knockout in metabolic cell models |
| PTGIR | Intestinal fibrosis in Crohn's disease | Knock-in or overexpression in fibroblast models |
| CCL5 | Calcific aortic valve disease and ferroptosis | Knockout or silencing in valve interstitial cells |
Inflammation and neuroinflammation
Enzyme-linked receptor signaling is a major driver of inflammatory gene expression. RAGE/NF-kB signaling contributes to neuroinflammation, and inhibiting this pathway attenuates inflammatory responses in vivo and in vitro. TLR9/NF-kB signaling similarly regulates cytokine responses in human peripheral blood mononuclear cells, highlighting the pathway's role in immune activation. TLR3 signaling induces ISG54, ISG56, and CXCL10 in astrocytoma cells, linking enzyme-linked receptor activation to chemokine output.
Metabolic and reproductive disorders
The EGFR/PI3K/AKT signaling cascade is implicated in ovulation dysfunction and insulin resistance in polycystic ovary syndrome, and regulating this cascade can improve these phenotypes in experimental models. This illustrates how enzyme-linked receptor pathways integrate metabolic and reproductive signals.
Fibrosis and tissue remodeling
Restoring prostacyclin/PGI2-PTGIR signaling alleviates intestinal fibrosis in Crohn's disease via fibroblast-specific YAP/TAZ inhibition, demonstrating that enzyme-linked receptor pathways control fibrotic programs. Chemokine pathway inhibition, such as silencing CCL5, suppresses ferroptosis in calcific aortic valve disease, further linking these pathways to tissue pathology.
Cancer and chemokine biology
Chemokine receptors exhibit biased signaling that can be probed experimentally, and this bias influences downstream responses relevant to cancer and inflammation. Enzyme-linked receptor signaling components are therefore studied as potential therapeutic targets across oncology and immune disorders.
From enzyme-linked receptor protein signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of receptor X reduce inflammatory gene expression? | CRISPR knockout in immune or glial cell lines |
| Does a specific phosphorylation site control downstream AKT activation? | Point-mutation knock-in of the receptor or substrate |
| Can restoring receptor signaling rescue a fibrotic phenotype? | Knock-in or overexpression of the receptor in fibroblasts |
| Which pathway components are required for cytokine output? | CRISPR library screening in stimulated immune cells |
| How does receptor localization change upon ligand binding? | Tagged knock-in with imaging-based readouts |
| Does chemokine receptor bias alter downstream signaling? | Point-mutation and overexpression models in chemokine receptor studies |
How to Study the enzyme-linked receptor protein signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Western blot | Phosphorylation and protein abundance | Receptor and downstream kinase activation |
| RT-qPCR | Transcript levels of target genes | Inflammatory and interferon-stimulated gene expression |
| RNA-seq | Global transcriptional changes | Pathway-level response to ligand stimulation |
| CRISPR knockout | Loss-of-function effects | Testing requirement of receptor or adaptor genes |
| CRISPR point mutation | Effect of specific residues | Dissecting phosphorylation or binding sites |
| Knock-in reporter | Localization and dynamics | Imaging receptor trafficking |
| Overexpression | Gain-of-function effects | Testing sufficiency of a pathway node |
| Library screening | Phenotype-linked gene discovery | Identifying novel pathway regulators |
Phospho-signaling assays
Western blotting and phospho-specific antibodies are used to measure activation of receptor and downstream kinases such as AKT and NF-kB components following ligand stimulation. These assays provide direct evidence of enzyme-linked receptor pathway engagement.
Transcriptional readouts
RT-qPCR and RNA-seq measure downstream transcriptional outputs, including inflammatory cytokines, chemokines such as CXCL10, and interferon-stimulated genes like ISG54 and ISG56. These readouts connect receptor activation to gene expression programs.
Genetic perturbation
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of specific pathway nodes. For example, silencing CCL5 suppresses ferroptosis in calcific aortic valve disease, demonstrating the utility of genetic perturbation in disease models.
Bioinformatics and pathway analysis
Pathway enrichment and network analysis help identify which enzyme-linked receptor modules are active in a given dataset. These approaches are particularly useful when combined with CRISPR screening data to prioritize candidate genes.
How CRISPR Can Be Used to Study GO:0007167 enzyme-linked receptor protein signaling pathway
Knockout
CRISPR knockout is used to delete receptors, kinases, or transcription factors in the enzyme-linked receptor pathway to test their requirement for downstream responses. For example, knocking out RAGE or TLR9 can reveal their contribution to NF-kB-driven cytokine expression.
Point Mutation
Point mutation models introduce specific amino acid changes to test the function of phosphorylation sites, binding motifs, or catalytic residues within receptor or downstream proteins. This approach is valuable for dissecting biased signaling in chemokine receptors and for mapping regulatory phosphosites.
Knock-in
Knock-in strategies can restore wild-type or mutant receptor expression, add tags for imaging, or introduce disease-relevant variants. These models are useful for studying receptor trafficking and for validating rescue of signaling defects in disease contexts.
Overexpression
Overexpression models test whether increased abundance of a receptor or downstream effector is sufficient to drive pathway activation and phenotypic changes. They are commonly used in metabolic and fibrotic disease models to probe gain-of-function effects.
How EDITGENE Supports enzyme-linked receptor protein signaling pathway Research
Researchers studying enzyme-linked receptor protein signaling pathway-related genes often need to determine whether a candidate gene is causally involved in a specific disease or cellular response. This requires well-controlled genetic models that can isolate the contribution of individual receptors, kinases, or transcription factors within the pathway.
Contact EDITGENE today to design your custom CRISPR model for enzyme-linked receptor protein signaling pathway research.
Frequently Asked Questions About enzyme-linked receptor protein signaling pathway
What is GO:0007167 enzyme-linked receptor protein signaling pathway?
GO:0007167 is a biological process describing signaling initiated by an extracellular ligand binding to a cell-surface receptor that has catalytic activity or is closely associated with an enzyme such as a protein kinase, ending with regulation of a downstream cellular process like transcription.
What genes are involved in enzyme-linked receptor protein signaling?
Key genes include EGFR, PIK3CA, AKT1, RAGE, NFKB1, TLR9, TLR3, CXCL10, CCL5, PTGIR, YAP1, and TAZ, among others.
How is enzyme-linked receptor signaling different from GPCR signaling?
Enzyme-linked receptors either have intrinsic catalytic activity or recruit enzymes such as kinases, whereas GPCRs signal primarily through G proteins; this distinction is central to GO:0007167.
What diseases are linked to enzyme-linked receptor signaling?
This pathway is linked to neuroinflammation, metabolic and reproductive disorders, intestinal fibrosis, calcific aortic valve disease, and cancer-related chemokine signaling.
How can I study enzyme-linked receptor signaling in the lab?
Common methods include phospho-signaling assays, RT-qPCR, RNA-seq, CRISPR knockout or point mutation, knock-in reporters, overexpression, and CRISPR library screening.
What is the role of NF-kB in enzyme-linked receptor signaling?
NF-kB is a downstream transcription factor node activated by receptors such as RAGE and TLR9, driving inflammatory gene expression.
Can CRISPR be used to study enzyme-linked receptor pathways?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to test the causal role of pathway components.
What is PI3K/AKT signaling in this pathway?
PI3K/AKT is a downstream module activated by receptor tyrosine kinases such as EGFR, regulating metabolism, survival, and proliferation.
How does TLR3 signaling relate to GO:0007167?
TLR3 is a receptor that engages downstream signaling to induce ISG54, ISG56, and CXCL10, illustrating enzyme-linked receptor pathway output in astrocytoma cells.
What services does EDITGENE offer for this pathway?
EDITGENE offers CRISPR knockout, point-mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics for enzyme-linked receptor signaling research.
Conclusion
GO:0007167 enzyme-linked receptor protein signaling pathway defines a central mechanism by which cells convert extracellular ligands into transcriptional and metabolic responses through catalytic receptors and associated kinases. Its broad involvement in inflammation, metabolic disease, fibrosis, and cancer makes it a high-value area for mechanistic and translational research. By combining CRISPR knockout, point-mutation, knock-in, overexpression, and library screening approaches with phospho-signaling and transcriptomic readouts, researchers can dissect pathway function with precision and identify candidate targets for therapeutic development.
References
- 1. Ding B et al.. 2020. Tanshinone IIA attenuates neuroinflammation via inhibiting RAGE/NF-κB signaling pathway in vivo and in vitro.. J Neuroinflammation 17(1):302 PMID: 33054814
- 2. Peng Y et al.. 2021. TLR9/NF-kB Pathway Regulates Brucella CpG DNA-mediated Cytokine Response in Human Peripheral Blood Mononuclear Cells.. Iran J Immunol 18(4):268-278 PMID: 34931613
- 3. Imaizumi T et al.. 2014. ISG54 and ISG56 are induced by TLR3 signaling in U373MG human astrocytoma cells: possible involvement in CXCL10 expression.. Neurosci Res 84:34-42 PMID: 24630834
- 4. An J et al.. 2025. Regulation of the EGFR/PI3K/AKT signaling cascade using the Shengui Yangrong Decoction improves ovulation dysfunction and insulin resistance in polycystic ovary syndrome.. Fitoterapia 182:106407 PMID: 39978644
- 5. Amarandi RM et al.. 2016. Probing Biased Signaling in Chemokine Receptors.. Methods Enzymol 570:155-86 PMID: 26921946
- 6. Zhang H et al.. 2026. Silencing CCL5 suppresses ferroptosis to alleviate calcific aortic valve disease through chemokine pathway inhibition.. Atherosclerosis 414:120640 PMID: 41621141
- 7. Ou W et al.. 2025. Restoring Prostacyclin/PGI2-PTGIR signaling alleviates intestinal fibrosis in Crohn's disease via fibroblast-specific YAP/TAZ inhibition.. J Crohns Colitis 19(6) PMID: 40390655
- 8. Li L et al.. 2024. NECA alleviates inflammatory responses in diabetic retinopathy through dendritic cell toll-like receptor signaling pathway.. Front Immunol 15:1415004 PMID: 38895119
