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-Structure paper
タイトル | Structure and organization of heteromeric AMPA-type glutamate receptors. |
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ジャーナル・号・ページ | Science, Vol. 352, Issue 6285, Page aad3873, Year 2016 |
掲載日 | 2016年4月29日 |
著者 | Beatriz Herguedas / Javier García-Nafría / Ondrej Cais / Rafael Fernández-Leiro / James Krieger / Hinze Ho / Ingo H Greger / |
PubMed 要旨 | AMPA-type glutamate receptors (AMPARs), which are central mediators of rapid neurotransmission and synaptic plasticity, predominantly exist as heteromers of the subunits GluA1 to GluA4. Here we ...AMPA-type glutamate receptors (AMPARs), which are central mediators of rapid neurotransmission and synaptic plasticity, predominantly exist as heteromers of the subunits GluA1 to GluA4. Here we report the first AMPAR heteromer structures, which deviate substantially from existing GluA2 homomer structures. Crystal structures of the GluA2/3 and GluA2/4 N-terminal domains reveal a novel compact conformation with an alternating arrangement of the four subunits around a central axis. This organization is confirmed by cysteine cross-linking in full-length receptors, and it permitted us to determine the structure of an intact GluA2/3 receptor by cryogenic electron microscopy. Two models in the ligand-free state, at resolutions of 8.25 and 10.3 angstroms, exhibit substantial vertical compression and close associations between domain layers, reminiscent of N-methyl-D-aspartate receptors. Model 1 resembles a resting state and model 2 a desensitized state, thus providing snapshots of gating transitions in the nominal absence of ligand. Our data reveal organizational features of heteromeric AMPARs and provide a framework to decipher AMPAR architecture and signaling. |
リンク | Science / PubMed:26966189 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.12 - 10.31 Å |
構造データ | EMDB-8090, PDB-5ide: EMDB-8091, PDB-5idf: PDB-5fwx: PDB-5fwy: |
化合物 | ChemComp-SO4: ChemComp-NAG: ChemComp-HOH: ChemComp-GOL: |
由来 |
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キーワード | TRANSPORT PROTEIN / SIGNALING PROTEIN / AMPA glutamate receptor |