Key result
Allosteric modulators alter unlabelled orthosteric ligand binding kinetics in a probe- and concentration-dependent manner.
Why the study?
Many GPCRs can be allosterically modulated by small-molecule ligands, but current kinetic assays often require labelling orthosteric ligands, limiting the study of diverse ligands.
Population
Human A1 adenosine receptor in vitro model
Comparison
Unlabelled orthosteric agonists with vs without allosteric modulators and bitopic ligands
Design
Competition association assay study
Authors
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No immediate clinical implications; extends allosteric research tools for A1 receptor and other GPCRs.
The competition association assay is a useful tool for exploring allosteric modulation of the human adenosine A1 receptor and potentially other GPCRs without requiring radiolabeling of the orthosteric ligand.
Guo et al. (2014) studied this question. Allosteric modulators and bitopic ligands vs. Absence of allosteric modulators was evaluated on Binding kinetics of unlabelled orthosteric agonists. The binding kinetics of an unlabelled orthosteric ligand were affected by the addition of an allosteric modulator in a probe- and concentration-dependent manner.
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