Key Facts
- Binding and activation are different measurements
- Affinity does not equal efficacy
- Receptor expression varies by model
- Competition assays can probe selectivity
Binding experiments
Binding assays can estimate how strongly a ligand associates with a target under defined conditions. They do not automatically reveal the downstream response produced by that interaction.
Functional assays
A functional assay measures a downstream event such as second-messenger production, ion movement or transcriptional change. Potency in one assay depends on receptor density and assay design.
Selectivity
A peptide may interact with more than one target, and structurally related receptors can complicate interpretation. Comparative testing helps define selectivity.
Model context
Receptor abundance, signaling partners and regulatory proteins differ across cell types and experimental systems.
What Remains Context-Dependent?
A receptor-binding result is mechanistic evidence, not a direct statement about organism-level benefit or risk.
How to Use This Concept in Research
This concept is most useful when it helps define the molecule, method, model or evidence level in a specific experiment. It should not be used as a shortcut for a clinical conclusion that the experiment did not test.
Reference Pathways
Use primary literature and authoritative scientific databases to verify compound-specific statements and methods.
Research Peptides · Peptide Research Guide · Peptide Science Library
Related Research Resources
Research Peptides · Peptide Research Guide · Peptide Science Library
