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-Structure paper
タイトル | Structural insights into opposing actions of neurosteroids on GABA receptors. |
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ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 5091, Year 2023 |
掲載日 | 2023年8月22日 |
著者 | Dagimhiwat H Legesse / Chen Fan / Jinfeng Teng / Yuxuan Zhuang / Rebecca J Howard / Colleen M Noviello / Erik Lindahl / Ryan E Hibbs / |
PubMed 要旨 | γ-Aminobutyric acid type A (GABA) receptors mediate fast inhibitory signaling in the brain and are targets of numerous drugs and endogenous neurosteroids. A subset of neurosteroids are GABA receptor ...γ-Aminobutyric acid type A (GABA) receptors mediate fast inhibitory signaling in the brain and are targets of numerous drugs and endogenous neurosteroids. A subset of neurosteroids are GABA receptor positive allosteric modulators; one of these, allopregnanolone, is the only drug approved specifically for treating postpartum depression. There is a consensus emerging from structural, physiological and photolabeling studies as to where positive modulators bind, but how they potentiate GABA activation remains unclear. Other neurosteroids are negative modulators of GABA receptors, but their binding sites remain debated. Here we present structures of a synaptic GABA receptor bound to allopregnanolone and two inhibitory sulfated neurosteroids. Allopregnanolone binds at the receptor-bilayer interface, in the consensus potentiator site. In contrast, inhibitory neurosteroids bind in the pore. MD simulations and electrophysiology support a mechanism by which allopregnanolone potentiates channel activity and suggest the dominant mechanism for sulfated neurosteroid inhibition is through pore block. |
リンク | Nat Commun / PubMed:37607940 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.65 - 2.98 Å |
構造データ | EMDB-40462, PDB-8sgo: EMDB-40503, PDB-8si9: EMDB-40506, PDB-8sid: |
化合物 | ChemComp-NAG: ChemComp-ABU: ChemComp-PTY: ChemComp-Q3G: ChemComp-A8W: ChemComp-Y4B: ChemComp-ZWY: ChemComp-POV: |
由来 |
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キーワード | TRANSPORT PROTEIN/IMMUNE SYSTEM / Ion channel / neurosteroids / TRANSPORT PROTEIN-IMMUNE SYSTEM complex / TRANSPORT PROTEIN |