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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-6657 | |||||||||
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Title | Structure of a eukaryotic cyclic nucleotide-gated channel | |||||||||
![]() | TAX-4 density map without symmetry imposed after post-processing in RELION1.4. The reported resolution is 4.5A. | |||||||||
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Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.5 Å | |||||||||
![]() | Li X | |||||||||
![]() | ![]() Title: Structure of a eukaryotic cyclic-nucleotide-gated channel. Authors: Minghui Li / Xiaoyuan Zhou / Shu Wang / Ioannis Michailidis / Ye Gong / Deyuan Su / Huan Li / Xueming Li / Jian Yang / ![]() ![]() Abstract: 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 ...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-Å-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. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 2.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 16.9 KB 16.9 KB | Display Display | ![]() |
Images | ![]() | 139.5 KB | ||
Others | ![]() | 11.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 78.1 KB | Display | ![]() |
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Full document | ![]() | 77.2 KB | Display | |
Data in XML | ![]() | 494 B | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | TAX-4 density map without symmetry imposed after post-processing in RELION1.4. The reported resolution is 4.5A. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.32 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: TAX-4 density map without symmetry imposed before post-processing...
File | emd_6657_additional.map | ||||||||||||
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Annotation | TAX-4 density map without symmetry imposed before post-processing in RELION1.4. The reported resolution is 5.1A. | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Cyclic nucleotide-gated (CNG) channels
Entire | Name: Cyclic nucleotide-gated (CNG) channels |
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Components |
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-Supramolecule #1: Cyclic nucleotide-gated (CNG) channels
Supramolecule | Name: Cyclic nucleotide-gated (CNG) channels / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Recombinant expression | Organism: ![]() |
-Macromolecule #1: Cyclic nucleotide-gated (CNG) channels
Macromolecule | Name: Cyclic nucleotide-gated (CNG) channels / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() |
Sequence | String: GGGGSMSTAE PAPDPTNPST SGLAPTTNGI GSPPPTASAA TKFSILTKFL RRKNQVHTTT AQQNEFMQKY MPNGNSNAVQ PAATGGQPAS SDGGSAIEVP PPKESYAVRI RKYLANYTQD PSTDNFYYWT CVVTVAYIYN LLFVIARQVF NDLIGPSSQS LCRFYNGTLN ...String: GGGGSMSTAE PAPDPTNPST SGLAPTTNGI GSPPPTASAA TKFSILTKFL RRKNQVHTTT AQQNEFMQKY MPNGNSNAVQ PAATGGQPAS SDGGSAIEVP PPKESYAVRI RKYLANYTQD PSTDNFYYWT CVVTVAYIYN LLFVIARQVF NDLIGPSSQS LCRFYNGTLN STTQVECTYN MLTNMKEMPT YSQYPDLGWS KYWHFRMLWV FFDLLMDCVY LIDTFLNYRM GYMDQGLVVR EAEKVTKAYW QSKQYRIDGI SLIPLDYILG WPIPYINWRG LPILRLNRLI RYKRVRNCLE RTETRSSMPN AFRVVVVVWY IVIIIHWNAC LYFWISEWIG LGTDAWVYGH LNKQSLPDDI TDTLLRRYVY SFYWSTLILT TIGEVPSPVR NIEYAFVTLD LMCGVLIFAT IVGNVGSMIS NMSAARTEFQ NKMDGIKQYM ELRKVSKQLE IRVIKWFDYL WTNKQSLSDQ QVLKVLPDKL QAEIAMQVHF ETLRKVRIFQ DCEAGLLAEL VLKLQLQVFS PGDFICKKGD IGREMYIVKR GRLQVVDDDG KKVFVTLQEG SVFGELSILN IAGSKNGNRR TANVRSVGYT DLFVLSKTDL WNALREYPDA RKLLLAKGRE ILKKDNLLDE NAPEEQKTVE EIAEHLNNAV KVLQTRMARL IVEHSSTEGK LMKRIEMLEK HLSRYKALAR RQKTMHGVSI DGGDISTDGV DERVRPPRLR QTKTIDLPTG TESESLLK |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.6 mg/mL | |||||||||||||||
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Buffer | pH: 7.4 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.039 kPa | |||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 281.15 K / Instrument: FEI VITROBOT MARK IV Details: Blotted for 4.0 seconds(double-sided, blot force 1),after waiting for 3 seconds the grid was immediately plunged into liquid ethane cooled by liquid-nitrogen.. | |||||||||||||||
Details | this sample was homogeneous |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Dimensions - Width: 7676 pixel / Digitization - Dimensions - Height: 7420 pixel / Digitization - Sampling interval: 5.0 µm / Digitization - Frames/image: 1-32 / Average exposure time: 8.0 sec. / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.7 µm / Nominal defocus min: 1.7 µm / Nominal magnification: 22500 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |