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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-24458 | ||||||||||||
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Title | Cryo-EM structure of human rod CNGA1/B1 channel in apo state | ||||||||||||
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![]() | ion channel / TRANSPORT PROTEIN | ||||||||||||
Function / homology | ![]() olfactory nerve maturation / non-motile cilium membrane / detection of chemical stimulus involved in sensory perception of smell / photoreceptor cell outer segment organization / protein localization to organelle / detection of light stimulus involved in visual perception / ion channel modulating, G protein-coupled receptor signaling pathway / response to odorant / VxPx cargo-targeting to cilium / rod photoreceptor outer segment ...olfactory nerve maturation / non-motile cilium membrane / detection of chemical stimulus involved in sensory perception of smell / photoreceptor cell outer segment organization / protein localization to organelle / detection of light stimulus involved in visual perception / ion channel modulating, G protein-coupled receptor signaling pathway / response to odorant / VxPx cargo-targeting to cilium / rod photoreceptor outer segment / intracellular cyclic nucleotide activated cation channel complex / intracellularly cGMP-activated cation channel activity / Golgi-associated vesicle membrane / intracellularly cAMP-activated cation channel activity / photoreceptor cell maintenance / retina homeostasis / sodium channel activity / ciliary membrane / photoreceptor outer segment membrane / sodium ion transport / monoatomic cation transmembrane transport / monoatomic cation transport / membrane depolarization / phototransduction / ligand-gated monoatomic ion channel activity / cGMP binding / photoreceptor outer segment / transmembrane transporter complex / cAMP binding / regulation of cytosolic calcium ion concentration / visual perception / Olfactory Signaling Pathway / potassium ion transport / Activation of the phototransduction cascade / calcium channel activity / terminal bouton / calcium ion transport / Inactivation, recovery and regulation of the phototransduction cascade / sensory perception of smell / positive regulation of gene expression / protein-containing complex binding / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.61 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 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 13.8 KB 13.8 KB | Display Display | ![]() |
Images | ![]() | 145.5 KB | ||
Filedesc metadata | ![]() | 5.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7rh9MC ![]() 7rhgC ![]() 7rhhC ![]() 7rhiC ![]() 7rhjC ![]() 7rhkC ![]() 7rhlC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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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: 0.842 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 : human rod Apo CNGA1/B1 channel in closed state
Entire | Name: human rod Apo CNGA1/B1 channel in closed state |
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Components |
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-Supramolecule #1: human rod Apo CNGA1/B1 channel in closed state
Supramolecule | Name: human rod Apo CNGA1/B1 channel in closed state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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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: 3 / 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: Cyclic nucleotide-gated cation channel beta-1
Macromolecule | Name: Cyclic nucleotide-gated cation channel beta-1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 91.039305 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MDYKDDDDKG GSASSGVPAT KQHPEVQVED TDADSCPLMA EENPPSTVLP PPSPAKSDTL IVPSSASGTH RKKLPSEDDE AEELKALSP AESPVVAWSD PTTPKDTDGQ DRAASTASTN SAIINDRLQE LVKLFKERTE KVKEKLIDPD VTSDEESPKP S PAKKAPEP ...String: MDYKDDDDKG GSASSGVPAT KQHPEVQVED TDADSCPLMA EENPPSTVLP PPSPAKSDTL IVPSSASGTH RKKLPSEDDE AEELKALSP AESPVVAWSD PTTPKDTDGQ DRAASTASTN SAIINDRLQE LVKLFKERTE KVKEKLIDPD VTSDEESPKP S PAKKAPEP APDTKPAEAE PVEEEHYCDM LCCKFKHRPW KKYQFPQSID PLTNLMYVLW LFFVVMAWNW NCWLIPVRWA FP YQTPDNI HHWLLMDYLC DLIYFLDITV FQTRLQFVRG GDIITDKKDM RNNYLKSRRF KMDLLSLLPL DFLYLKVGVN PLL RLPRCL KYMAFFEFNS RLESILSKAY VYRVIRTTAY LLYSLHLNSC LYYWASAYQG LGSTHWVYDG VGNSYIRCYY FAVK TLITI GGLPDPKTLF EIVFQLLNYF TGVFAFSVMI GQMRDVVGAA TAGQTYYRSC MDSTVKYMNF YKIPKSVQNR VKTWY EYTW HSQGMLDESE LMVQLPDKMR LDLAIDVNYN IVSKVALFQG CDRQMIFDML KRLRSVVYLP NDYVCKKGEI GREMYI IQA GQVQVLGGPD GKSVLVTLKA GSVFGEISLL AVGGGNRRTA NVVAHGFTNL FILDKKDLNE ILVHYPESQK LLRKKAR RM LRSNNKPKEE KSVLILPPRA GTPKLFNAAL AMTGKMGGKG AKGGKLAHLR ARLKELAALE AAAKQQELVE QAKSSQDV K GEEGSAAPDQ HTHPKEAATD PPAPRTPPEP PGSPPSSPPP ASLGRPEGEE EGPAEPEEHS VRICMSPGPE PGEQILSVK MPEEREEKAE UniProtKB: Cyclic nucleotide-gated channel beta-1 |
-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 |
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Image processing
Startup model | Type of model: EMDB MAP |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 687702 |
Initial angle assignment | Type: RANDOM ASSIGNMENT |
Final angle assignment | Type: RANDOM ASSIGNMENT |