Biomolecular interactions perform signaling cascades, regulatory circuits, and metabolic fluxes that define cellular behavior, health, and disease. Drugs exert their effects by modulating these interactions, either by binding directly to a target protein, altering a signaling pathway, or reprogramming metabolic or regulatory networks.
Biomolecular interactions may be used to identify drug targets, elucidating mechanisms of action (MoA), predicting therapeutic and off-target effects, and designing safer, more effective therapies.
| Pathway/Mechanism | Key Components/Pathway | Example Mechanisms/Receptors | Role in Drug Discovery |
|---|---|---|---|
| Ligand–Receptor Binding | Signal Transduction | GPCRs, RTKs, Nuclear Receptors | Target identification, pathway modulation |
| Protein–Protein Interactions | Kinase Cascades, Complex Formation | EGFR, MAPK, JAK-STAT | Targeting signaling hubs, disrupting disease networks |
| Ion Flux | Ionotropic Signaling | Nicotinic ACh, GABA-A, NMDA | Modulating neuronal/cardiac function |
| Gene Regulation | Transcriptional Regulation | Glucocorticoid, Estrogen Receptors | Mechanism elucidation, biomarker discovery |
| Second Messenger Systems | Metabolic/Regulatory | cAMP, IP₃, DAG, Ca²⁺ | Targeting metabolic vulnerabilities |
| Allosteric Modulation | Modulatory Signaling | GPCRs, RTKs | Improving selectivity, reducing side effects |
| Feedback Loops | Homeostatic Regulation | Desensitization, Receptor Downregulation | Understanding resistance, optimizing efficacy |