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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-23306 | |||||||||
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Title | Cryo-EM structure of human Apo CNGA1 channel in K+/Ca2+ | |||||||||
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![]() | ALPHA-HELICAL / MEMBRANE PROTEIN / ION CHANNEL | |||||||||
Function / homology | ![]() rod photoreceptor outer segment / intracellular cyclic nucleotide activated cation channel complex / intracellularly cGMP-activated cation channel activity / intracellularly cAMP-activated cation channel activity / sodium channel activity / photoreceptor outer segment membrane / sodium ion transport / monoatomic cation transmembrane transport / cGMP binding / cAMP binding ...rod photoreceptor outer segment / intracellular cyclic nucleotide activated cation channel complex / intracellularly cGMP-activated cation channel activity / intracellularly cAMP-activated cation channel activity / sodium channel activity / photoreceptor outer segment membrane / sodium ion transport / monoatomic cation transmembrane transport / cGMP binding / cAMP binding / visual perception / Activation of the phototransduction cascade / calcium channel activity / calcium ion transport / Inactivation, recovery and regulation of the phototransduction cascade / protein-containing complex binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.6 Å | |||||||||
![]() | Xue J / Han Y | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural mechanisms of gating and selectivity of human rod CNGA1 channel. Authors: Jing Xue / Yan Han / Weizhong Zeng / Yan Wang / Youxing Jiang / ![]() Abstract: Mammalian cyclic nucleotide-gated (CNG) channels play an essential role in the signal transduction of the visual and olfactory sensory systems. Here we reveal the structural mechanism of ligand ...Mammalian cyclic nucleotide-gated (CNG) channels play an essential role in the signal transduction of the visual and olfactory sensory systems. Here we reveal the structural mechanism of ligand gating in human rod CNGA1 channel by determining its cryo-EM structures in both the apo closed and cGMP-bound open states. Distinct from most other members of voltage-gated tetrameric cation channels, CNGA1 forms a central channel gate in the middle of the membrane, occluding the central cavity. Structural analyses of ion binding profiles in the selectivity filters of the wild-type channel and the E365Q filter mutant allow us to unambiguously define the two Ca binding sites inside the selectivity filter, providing structural insights into Ca blockage and permeation in CNG channels. The structure of the E365Q mutant also reveals two alternative side-chain conformations at Q365, providing a plausible explanation for the voltage-dependent gating of CNG channel acquired upon E365 mutation. | |||||||||
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 | ![]() | 85.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.8 KB 10.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 10.3 KB | Display | ![]() |
Images | ![]() | 181.5 KB | ||
Filedesc metadata | ![]() | 5.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7lftMC ![]() 7lfwC ![]() 7lfxC ![]() 7lfyC ![]() 7lg1C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 84.9 Data #1: Final particle stack of the CNGA1 channel in apo state [picked particles - multiframe - processed]) |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.844 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Apo CNGA1 homotetramer in K+/Ca2+
Entire | Name: Apo CNGA1 homotetramer in K+/Ca2+ |
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Components |
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-Supramolecule #1: Apo CNGA1 homotetramer in K+/Ca2+
Supramolecule | Name: Apo CNGA1 homotetramer in K+/Ca2+ / type: cell / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: cGMP-gated cation channel alpha-1
Macromolecule | Name: cGMP-gated cation channel alpha-1 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 64.650434 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MDYKDDDDKG GSASKDKKEE EKKEVVVIDP SGNTYYNWLF CITLPVMYNW TMVIARACFD ELQSDYLEYW LILDYVSDIV YLIDMFVRT RTGYLEQGLL VKEELKLINK YKSNLQFKLD VLSLIPTDLL YFKLGWNYPE IRLNRLLRFS RMFEFFQRTE T RTNYPNIF ...String: MDYKDDDDKG GSASKDKKEE EKKEVVVIDP SGNTYYNWLF CITLPVMYNW TMVIARACFD ELQSDYLEYW LILDYVSDIV YLIDMFVRT RTGYLEQGLL VKEELKLINK YKSNLQFKLD VLSLIPTDLL YFKLGWNYPE IRLNRLLRFS RMFEFFQRTE T RTNYPNIF RISNLVMYIV IIIHWNACVF YSISKAIGFG NDTWVYPDIN DPEFGRLARK YVYSLYWSTL TLTTIGETPP PV RDSEYVF VVVDFLIGVL IFATIVGNIG SMISNMNAAR AEFQARIDAI KQYMHFRNVS KDMEKRVIKW FDYLWTNKKT VDE KEVLKY LPDKLRAEIA INVHLDTLKK VRIFADCEAG LLVELVLKLQ PQVYSPGDYI CKKGDIGREM YIIKEGKLAV VADD GVTQF VVLSDGSYFG EISILNIKGS KAGNRRTANI KSIGYSDLFC LSKDDLMEAL TEYPDAKTML EEKGKQILMK DGLLD LNIA NAGSDPKDLE EKVTRMEGSV DLLQTRFARI LAEYESMQQK LKQRLTKVEK FLKPLIDTEF SSIEGPGAES GPIDST UniProtKB: Cyclic nucleotide-gated channel alpha-1 |
-Macromolecule #2: CHOLESTEROL
Macromolecule | Name: CHOLESTEROL / type: ligand / ID: 2 / Number of copies: 8 / Formula: CLR |
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Molecular weight | Theoretical: 386.654 Da |
Chemical component information | ![]() ChemComp-CLR: |
-Macromolecule #3: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
Macromolecule | Name: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 3 / Number of copies: 24 / Formula: CPL |
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Molecular weight | Theoretical: 758.06 Da |
Chemical component information | ![]() ChemComp-CPL: |
-Macromolecule #4: POTASSIUM ION
Macromolecule | Name: POTASSIUM ION / type: ligand / ID: 4 / Number of copies: 3 / Formula: K |
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Molecular weight | Theoretical: 39.098 Da |
-Macromolecule #5: water
Macromolecule | Name: water / type: ligand / ID: 5 / Number of copies: 4 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 1.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |