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TitlePositive and negative allosteric modulation of GluK2 kainate receptors by BPAM344 and antiepileptic perampanel.
Journal, issue, pagesCell Rep, Vol. 42, Issue 2, Page 112124, Year 2023
Publish dateFeb 21, 2023
AuthorsShanti Pal Gangwar / Laura Y Yen / Maria V Yelshanskaya / Alexander I Sobolevsky /
PubMed AbstractKainate receptors (KARs) are a subtype of ionotropic glutamate receptors that control synaptic transmission in the central nervous system and are implicated in neurological, psychiatric, and ...Kainate receptors (KARs) are a subtype of ionotropic glutamate receptors that control synaptic transmission in the central nervous system and are implicated in neurological, psychiatric, and neurodevelopmental disorders. Understanding the regulation of KAR function by small molecules is essential for exploring these receptors as drug targets. Here, we present cryoelectron microscopy (cryo-EM) structures of KAR GluK2 in complex with the positive allosteric modulator BPAM344, competitive antagonist DNQX, and negative allosteric modulator, antiepileptic drug perampanel. Our structures show that two BPAM344 molecules bind per ligand-binding domain dimer interface. In the absence of an agonist or in the presence of DNQX, BPAM344 stabilizes GluK2 in the closed state. The closed state is also stabilized by perampanel, which binds to the ion channel extracellular collar sites located in two out of four GluK2 subunits. The molecular mechanisms of positive and negative allosteric modulation of KAR provide a guide for developing new therapeutic strategies.
External linksCell Rep / PubMed:36857176 / PubMed Central
MethodsEM (single particle)
Resolution3.03 - 3.96 Å
Structure data

EMDB-29515, PDB-8fwq:
Structure of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344
Method: EM (single particle) / Resolution: 3.96 Å

EMDB-29516, PDB-8fwr:
Structure of the amino-terminal domain of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-29517, PDB-8fws:
Structure of the ligand-binding and transmembrane domains of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344
Method: EM (single particle) / Resolution: 3.23 Å

EMDB-29518, PDB-8fwt:
Structure of the amino terminal domain of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344 and competitive antagonist DNQX
Method: EM (single particle) / Resolution: 3.09 Å

EMDB-29519, PDB-8fwu:
Structure of the ligand-binding and transmembrane domains of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344 and competitive antagonist DNQX
Method: EM (single particle) / Resolution: 3.18 Å

EMDB-29520, PDB-8fwv:
Structure of the amino-terminal domain of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344 and noncompetitive inhibitor perampanel
Method: EM (single particle) / Resolution: 3.03 Å

EMDB-29521, PDB-8fww:
Structure of the ligand-binding and transmembrane domains of kainate receptor GluK2 in complex with the positive allosteric modulator BPAM344 and noncompetitive inhibitor perampanel
Method: EM (single particle) / Resolution: 3.1 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

ChemComp-2J9:
4-cyclopropyl-7-fluoro-3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide

ChemComp-NA:
Unknown entry

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM

ChemComp-CL:
Unknown entry

ChemComp-DNQ:
6,7-DINITROQUINOXALINE-2,3-DIONE / antagonist*YM

ChemComp-HOH:
WATER

ChemComp-6ZP:
2-(6'-oxo-1'-phenyl[1',6'-dihydro[2,3'-bipyridine]]-5'-yl)benzonitrile / medication*YM

Source
  • rattus norvegicus (Norway rat)
KeywordsMEMBRANE PROTEIN / ion channel / iGluR / Kainate receptor / positive allosteric modulator / DNQX / Perampanel

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