Partial agonists and heteromeric Kainate receptor desensitization

Partial agonists produce conserved desensitization onset in GluK2 homomers and GluK2/GluK5 heteromers, but desensitization recovery is significantly slower in heteromers.

• Why it matters: The mechanisms linking partial agonism to KAR desensitization and recovery are unclear, especially for predominant native heteromeric assemblies.
• What they did: Using electrophysiology alongside microscale thermophoresis binding assays, the study compared desensitization onset and recovery for GluK2 versus GluK2/GluK5 under high/saturating partial-agonist concentrations, supported by structural modeling of GluK2 and GluK5 LBDs.
• The result: Across agonists, agonist residence time and the extent of LBD bi-lobe closure better predict KAR desensitization than subunit composition, implying heteromeric recovery differences arise from ligand–receptor dynamics.

AI summary of the abstract · may contain errors · not medical advice · read the paper.