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Title: Pentameric ligand-gated ion channel ELIC is activated by GABA and modulated by benzodiazepines
Authors: Spurny, Radovan ×
Ramerstorfer, Joachim
Price, Kerry
Brams, Marijke
Ernst, Margot
Nury, Hugues
Verheij, Mark
Legrand, Pierre
Bertrand, Daniel
Bertrand, Sonia
Dougherty, Dennis A
de Esch, Iwan J P
Corringer, Pierre-Jean
Sieghart, Werner
Lummis, Sarah C R
Ulens, Chris #
Issue Date: Oct-2012
Publisher: National Academy of Sciences
Series Title: Proceedings of the National Academy of Sciences of the United States of America vol:109 issue:44 pages:E3028-E3034
Abstract: GABA(A) receptors are pentameric ligand-gated ion channels involved in fast inhibitory neurotransmission and are allosterically modulated by the anxiolytic, anticonvulsant, and sedative-hypnotic benzodiazepines. Here we show that the prokaryotic homolog ELIC also is activated by GABA and is modulated by benzodiazepines with effects comparable to those at GABA(A) receptors. Crystal structures reveal important features of GABA recognition and indicate that benzodiazepines, depending on their concentration, occupy two possible sites in ELIC. An intrasubunit site is adjacent to the GABA-recognition site but faces the channel vestibule. A second intersubunit site partially overlaps with the GABA site and likely corresponds to a low-affinity benzodiazepine-binding site in GABA(A) receptors that mediates inhibitory effects of the benzodiazepine flurazepam. Our study offers a structural view how GABA and benzodiazepines are recognized at a GABA-activated ion channel.
URI: 
ISSN: 0027-8424
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Structural Neurobiology
× corresponding author
# (joint) last author

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