Download MendeleyMultisite Binding of a General Anesthetic to the Prokaryotic Pentameric Erwinia Chrysanthemi Ligand-Gated Ion Channel (Elic).
Spurny, R., Billen, B., Howard, R.J., Brams, M., Debaveye, S., Price, K.L., Weston, D.A., Strelkov, S.V., Tytgat, J., Bertrand, S., Bertrand, D., Lummis, S.C.R., Ulens, C.(2013) J Biol Chem 288: 8355
- PubMed: 23364792
- DOI: https://doi.org/10.1074/jbc.M112.424507
- Primary Citation of Related Structures:
3ZKR - PubMed Abstract:
Pentameric ligand-gated ion channels (pLGICs), such as nicotinic acetylcholine, glycine, γ-aminobutyric acid GABA(A/C) receptors, and the Gloeobacter violaceus ligand-gated ion channel (GLIC), are receptors that contain multiple allosteric binding sites for a variety of therapeutics, including general anesthetics. Here, we report the x-ray crystal structure of the Erwinia chrysanthemi ligand-gated ion channel (ELIC) in complex with a derivative of chloroform, which reveals important features of anesthetic recognition, involving multiple binding at three different sites. One site is located in the channel pore and equates with a noncompetitive inhibitor site found in many pLGICs. A second transmembrane site is novel and is located in the lower part of the transmembrane domain, at an interface formed between adjacent subunits. A third site is also novel and is located in the extracellular domain in a hydrophobic pocket between the β7-β10 strands. Together, these results extend our understanding of pLGIC modulation and reveal several specific binding interactions that may contribute to modulator recognition, further substantiating a multisite model of allosteric modulation in this family of ion channels.
Organizational Affiliation:
Laboratory of Structural Neurobiology, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, PB 601, B-3000 Leuven, Belgium.
