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© Marie Prévost, Institut Pasteur
Image of a portion of a Xenopus oocyte expressing a channel receptor.
Publication : Neuropharmacology

3D structure and allosteric modulation of the transmembrane domain of pentameric ligand-gated ion channels

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Neuropharmacology - 14 Aug 2010

Baenziger JE, Corringer PJ

Link to Pubmed [PMID] – 20713066

Neuropharmacology 2011 Jan;60(1):116-25

Pentameric ligand-gated ion channels mediate rapid chemo-electric signal transduction in animals. The active site of this family of proteins is their ion channel pore, which is located at the center of the transmembrane domain. The opening/closing motions of the channel pore are governed by the binding of neurotransmitter to the extracellular domain, but also by allosteric effectors acting within the transmembrane domain. Here, we review the structure of the transmembrane domain as well as its role in the allosteric modulation of pentameric ligand-gated ion channel function. We focus on two examples: the interactions of nicotinic ACh receptors with lipids, for which a novel “uncoupled” state has been proposed, and the interactions of GABA(A) and Glycine receptors with allosteric modulators, such as general anesthetics, ethanol and neurosteroids. We revisit these data in light of the recently solved X-ray structures of bacterial members of the family, which provide atomic-resolution insight into the structures of both the transmembrane domain and associated lipids.

http://www.ncbi.nlm.nih.gov/pubmed/20713066