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5LID

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) in complex with bromopromazine

Summary for 5LID
Entry DOI10.2210/pdb5lid/pdb
DescriptorCys-loop ligand-gated ion channel, bromopromazine (2 entities in total)
Functional Keywordsligand-gated ion channel, transport protein
Biological sourceDickeya chrysanthemi (Pectobacterium chrysanthemi)
Total number of polymer chains10
Total formula weight361099.97
Authors
Nys, M.,Wijckmans, E.,Farinha, A.,Brams, M.,Spurny, R.,Ulens, C. (deposition date: 2016-07-14, release date: 2016-10-26, Last modification date: 2024-05-08)
Primary citationNys, M.,Wijckmans, E.,Farinha, A.,Yoluk, O.,Andersson, M.,Brams, M.,Spurny, R.,Peigneur, S.,Tytgat, J.,Lindahl, E.,Ulens, C.
Allosteric binding site in a Cys-loop receptor ligand-binding domain unveiled in the crystal structure of ELIC in complex with chlorpromazine.
Proc.Natl.Acad.Sci.USA, 113:E6696-E6703, 2016
Cited by
PubMed Abstract: Pentameric ligand-gated ion channels or Cys-loop receptors are responsible for fast inhibitory or excitatory synaptic transmission. The antipsychotic compound chlorpromazine is a widely used tool to probe the ion channel pore of the nicotinic acetylcholine receptor, which is a prototypical Cys-loop receptor. In this study, we determine the molecular determinants of chlorpromazine binding in the Erwinia ligand-gated ion channel (ELIC). We report the X-ray crystal structures of ELIC in complex with chlorpromazine or its brominated derivative bromopromazine. Unexpectedly, we do not find a chlorpromazine molecule in the channel pore of ELIC, but behind the β8-β9 loop in the extracellular ligand-binding domain. The β8-β9 loop is localized downstream from the neurotransmitter binding site and plays an important role in coupling of ligand binding to channel opening. In combination with electrophysiological recordings from ELIC cysteine mutants and a thiol-reactive derivative of chlorpromazine, we demonstrate that chlorpromazine binding at the β8-β9 loop is responsible for receptor inhibition. We further use molecular-dynamics simulations to support the X-ray data and mutagenesis experiments. Together, these data unveil an allosteric binding site in the extracellular ligand-binding domain of ELIC. Our results extend on previous observations and further substantiate our understanding of a multisite model for allosteric modulation of Cys-loop receptors.
PubMed: 27791038
DOI: 10.1073/pnas.1603101113
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (4.5 Å)
Structure validation

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