Saltar al contenido
Merck

Multisite binding of a general anesthetic to the prokaryotic pentameric Erwinia chrysanthemi ligand-gated ion channel (ELIC).

The Journal of biological chemistry (2013-02-01)
Radovan Spurny, Bert Billen, Rebecca J Howard, Marijke Brams, Sarah Debaveye, Kerry L Price, David A Weston, Sergei V Strelkov, Jan Tytgat, Sonia Bertrand, Daniel Bertrand, Sarah C R Lummis, Chris Ulens
RESUMEN

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.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Cloroformo, contains 100-200 ppm amylenes as stabilizer, ≥99.5%
Sigma-Aldrich
Cloroformo, HPLC Plus, for HPLC, GC, and residue analysis, ≥99.9%, contains amylenes as stabilizer
Sigma-Aldrich
Cloroformo, suitable for HPLC, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Cloroformo, contains ethanol as stabilizer, ACS reagent, ≥99.8%
Sigma-Aldrich
Cloroformo, suitable for HPLC, ≥99.8%, amylene stabilized
Sigma-Aldrich
Cloroformo, contains amylenes as stabilizer, ACS reagent, ≥99.8%
Sigma-Aldrich
Cloroformo, ReagentPlus®, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Cloroformo, puriss. p.a., reag. ISO, reag. Ph. Eur., 99.0-99.4% (GC)
Sigma-Aldrich
Cloroformo, HPLC Plus, for HPLC, GC, and residue analysis, ≥99.9%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Cloroformo, ACS spectrophotometric grade, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Cloroformo, biotech. grade, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Cloroformo, anhydrous, ≥99%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Bromoform, contains 60-120 ppm 2-methyl-2-butene as stabilizer, 99%
Sigma-Aldrich
Cloroformo, anhydrous, contains amylenes as stabilizer, ≥99%
Sigma-Aldrich
Cloroformo, contains ethanol as stabilizer, meets analytical specification of BP, 99-99.4% (GC)
Sigma-Aldrich
Bromoform, contains 1-3% ethanol as stabilizer, 96%
Sigma-Aldrich
Cloroformo, ≥99%, PCR Reagent, contains amylenes as stabilizer
Supelco
Cloroformo, analytical standard
Supelco
Bromoform solution, certified reference material, 5000 μg/mL in methanol
Supelco
Cloroformo, suitable for HPLC, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Supelco
Bromoform, amylene stabilized, analytical standard