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Nat Struct Mol Biol. 2012 May 13;19(6):642-9. doi: 10.1038/nsmb.2307.

A locally closed conformation of a bacterial pentameric proton-gated ion channel.

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1
Institut Pasteur, Groupe Récepteurs-Canaux, Paris, France.

Abstract

Pentameric ligand-gated ion channels mediate signal transduction through conformational transitions between closed-pore and open-pore states. To stabilize a closed conformation of GLIC, a bacterial proton-gated homolog from Gloeobacter violaceus whose open structure is known, we separately generated either four cross-links or two single mutations. We found all six mutants to be in the same 'locally closed' conformation using X-ray crystallography, sharing most of the features of the open form but showing a locally closed pore as a result of a concerted bending of all of its M2 helices. The mutants adopt several variant conformations of the M2-M3 loop, and in all cases an interacting lipid that is observed in the open form disappears. A single cross-linked mutant is functional, according to electrophysiology, and the locally closed structure of this mutant indicates that it has an increased flexibility. Further cross-linking, accessibility and molecular dynamics data suggest that the locally closed form is a functionally relevant conformation that occurs during allosteric gating transitions.

PMID:
22580559
DOI:
10.1038/nsmb.2307
[Indexed for MEDLINE]
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