8si9 | pdb_00008si9

Human GABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus allopregnanolone

spinqualitylabelsall models 8si9, resolution 2.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8si9 is a 9 chain structure with sequence from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.98Å Ligands: ABU, BMA, MAN, NAG, Y4B Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed gamma-Aminobutyric acid type A (GABA(A)) receptors mediate fast inhibitory signaling in the brain and are targets of numerous drugs and endogenous neurosteroids. A subset of neurosteroids are GABA(A) 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(A) receptors, but their binding sites remain debated. Here we present structures of a synaptic GABA(A) 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. Structural insights into opposing actions of neurosteroids on GABA(A) receptors.,Legesse DH, Fan C, Teng J, Zhuang Y, Howard RJ, Noviello CM, Lindahl E, Hibbs RE Nat Commun. 2023 Aug 22;14(1):5091. doi: 10.1038/s41467-023-40800-1. PMID:37607940 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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