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Convergent evolution of sodium ion selectivity in metazoan neuronal signaling

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dc.contributor.author Barzilai, Maya Gur
dc.contributor.author Reitzel, Adam M.
dc.contributor.author Kraus, Johanna E. M.
dc.contributor.author Gordon, Dalia
dc.contributor.author Technau, Ulrich
dc.contributor.author Gurevitz, Michael
dc.contributor.author Moran, Yehu
dc.date.accessioned 2012-11-28T20:44:06Z
dc.date.available 2012-11-28T20:44:06Z
dc.date.issued 2012-08-30
dc.identifier.citation Cell Reports 2 (2012): 242–248 en_US
dc.identifier.uri http://hdl.handle.net/1912/5590
dc.description © The Author(s), 2012. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Cell Reports 2 (2012): 242–248, doi:10.1016/j.celrep.2012.06.016. en_US
dc.description.abstract Ion selectivity of metazoan voltage-gated Na+ channels is critical for neuronal signaling and has long been attributed to a ring of four conserved amino acids that constitute the ion selectivity filter (SF) at the channel pore. Yet, in addition to channels with a preference for Ca2+ ions, the expression and characterization of Na+ channel homologs from the sea anemone Nematostella vectensis, a member of the early-branching metazoan phylum Cnidaria, revealed a sodium-selective channel bearing a noncanonical SF. Mutagenesis and physiological assays suggest that pore elements additional to the SF determine the preference for Na+ in this channel. Phylogenetic analysis assigns the Nematostella Na+-selective channel to a channel group unique to Cnidaria, which diverged >540 million years ago from Ca2+-conducting Na+ channel homologs. The identification of Cnidarian Na+-selective ion channels distinct from the channels of bilaterian animals indicates that selectivity for Na+ in neuronal signaling emerged independently in these two animal lineages. en_US
dc.description.sponsorship This study was supported by a research grant from the Austrian National Science Foundation (FWF P 21108-B17) to U.T., and by a United States-Israel Binational Agricultural Research and Development Grant (IS-4313-10) and an Israeli Science Foundation grant (107/08) to M.G. en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.publisher Cell Press en_US
dc.relation.uri http://dx.doi.org/10.1016/j.celrep.2012.06.016
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ *
dc.title Convergent evolution of sodium ion selectivity in metazoan neuronal signaling en_US
dc.type Article en_US
dc.identifier.doi 10.1016/j.celrep.2012.06.016


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