Mechanism and subunit-dependence of disease-associated lurcher mutation in AMPA-type glutamate receptors

Lurcher (SYTANLAAF Ala3→Thr) in GluA2-containing AMPA receptor homomers slows deactivation and desensitization more than in GluA1 homomers, with stronger desensitization block.

• Why it matters: Disease-linked lurcher mutations disrupt fast excitatory signaling, but how subunit composition shapes receptor kinetics and drug sensitivity remains unclear.
• What they did: Using homomeric AMPA receptors with GluA1 or GluA2, and heteromers with two GluA1 lurcher plus two GluA2 WT subunits, the study measured kinetics and performed Schild analysis and perampanel inhibition.
• The result: Lurcher effects persist in GluA1 lc/GluA2 WT heteromers and are linked to altered channel opening efficiency after glutamate binding; perampanel inhibition continues, with IC50 shifting by auxiliary subunits, reaching submicromolar with stargazin (TARP gamma-2).

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