5h3o

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Structure of a eukaryotic cyclic nucleotide-gated channel

Structural highlights

5h3o is a 4 chain structure with sequence from Caenorhabditis elegans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.5Å
Experimental data:Check to display Experimental Data
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CNG_CAEEL Required for normal thermosensation and chemosensation sensory behavior (PubMed:8893027). Required, downstream of receptor-type guanylate cyclase gcy-9, for CO2-mediated responses in BAG neurons (PubMed:21173231). Required, downstream of receptor-type guanylate cyclase gcy-14, for alkaline pH-mediated responses in ASE-left (ASEL) neurons (PubMed:23664973). Involved in the development of ASJ sensory neuron axon during late larval stages and in the maintenance of normal axon morphology in the adult. Regulates dauer formation (PubMed:9486798). In ASI and ASJ sensory neurons, controls behavioral response to P.aeruginosa by up-regulating the transcription of daf-7, a member of the TGF-beta family (PubMed:25303524). In AWB and AWC sensory neurons, mediates the recognition of food oders which subsequently allows for the detection of preferred food sources (PubMed:25009271).[1] [2] [3] [4] [5] [6]

Publication Abstract from PubMed

Cyclic-nucleotide-gated channels are essential for vision and olfaction. They belong to the voltage-gated ion channel superfamily but their activities are controlled by intracellular cyclic nucleotides instead of transmembrane voltage. Here we report a 3.5-A-resolution single-particle electron cryo-microscopy structure of a cyclic-nucleotide-gated channel from Caenorhabditis elegans in the cyclic guanosine monophosphate (cGMP)-bound open state. The channel has an unusual voltage-sensor-like domain, accounting for its deficient voltage dependence. A carboxy-terminal linker connecting S6 and the cyclic-nucleotide-binding domain interacts directly with both the voltage-sensor-like domain and the pore domain, forming a gating ring that couples conformational changes triggered by cyclic nucleotide binding to the gate. The selectivity filter is lined by the carboxylate side chains of a functionally important glutamate and three rings of backbone carbonyls. This structure provides a new framework for understanding mechanisms of ion permeation, gating and channelopathy of cyclic-nucleotide-gated channels and cyclic nucleotide modulation of related channels.

Structure of a eukaryotic cyclic-nucleotide-gated channel.,Li M, Zhou X, Wang S, Michailidis I, Gong Y, Su D, Li H, Li X, Yang J Nature. 2017 Feb 2;542(7639):60-65. doi: 10.1038/nature20819. Epub 2017 Jan 18. PMID:28099415[7]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. ↑ Hallem EA, Spencer WC, McWhirter RD, Zeller G, Henz SR, Ratsch G, Miller DM 3rd, Horvitz HR, Sternberg PW, Ringstad N. Receptor-type guanylate cyclase is required for carbon dioxide sensation by Caenorhabditis elegans. Proc Natl Acad Sci U S A. 2011 Jan 4;108(1):254-9. doi: 10.1073/pnas.1017354108. , Epub 2010 Dec 20. PMID:21173231 doi:http://dx.doi.org/10.1073/pnas.1017354108
  2. ↑ Murayama T, Takayama J, Fujiwara M, Maruyama IN. Environmental alkalinity sensing mediated by the transmembrane guanylyl cyclase GCY-14 in C. elegans. Curr Biol. 2013 Jun 3;23(11):1007-12. doi: 10.1016/j.cub.2013.04.052. Epub 2013, May 9. PMID:23664973 doi:http://dx.doi.org/10.1016/j.cub.2013.04.052
  3. ↑ Harris G, Shen Y, Ha H, Donato A, Wallis S, Zhang X, Zhang Y. Dissecting the signaling mechanisms underlying recognition and preference of food odors. J Neurosci. 2014 Jul 9;34(28):9389-403. doi: 10.1523/JNEUROSCI.0012-14.2014. PMID:25009271 doi:http://dx.doi.org/10.1523/JNEUROSCI.0012-14.2014
  4. ↑ Meisel JD, Panda O, Mahanti P, Schroeder FC, Kim DH. Chemosensation of bacterial secondary metabolites modulates neuroendocrine signaling and behavior of C. elegans. Cell. 2014 Oct 9;159(2):267-80. doi: 10.1016/j.cell.2014.09.011. PMID:25303524 doi:http://dx.doi.org/10.1016/j.cell.2014.09.011
  5. ↑ Komatsu H, Mori I, Rhee JS, Akaike N, Ohshima Y. Mutations in a cyclic nucleotide-gated channel lead to abnormal thermosensation and chemosensation in C. elegans. Neuron. 1996 Oct;17(4):707-18. PMID:8893027
  6. ↑ Coburn CM, Mori I, Ohshima Y, Bargmann CI. A cyclic nucleotide-gated channel inhibits sensory axon outgrowth in larval and adult Caenorhabditis elegans: a distinct pathway for maintenance of sensory axon structure. Development. 1998 Jan;125(2):249-58. PMID:9486798
  7. ↑ Li M, Zhou X, Wang S, Michailidis I, Gong Y, Su D, Li H, Li X, Yang J. Structure of a eukaryotic cyclic-nucleotide-gated channel. Nature. 2017 Feb 2;542(7639):60-65. doi: 10.1038/nature20819. Epub 2017 Jan 18. PMID:28099415 doi:http://dx.doi.org/10.1038/nature20819

Contents


5h3o, resolution 3.50Å

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