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Open data
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Basic information
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Title | cryo-EM structure of Connexin 32 gap junction channel | |||||||||
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Function / homology | ![]() purine ribonucleotide transport / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||
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Method | ![]() ![]() | |||||||||
![]() | Qi C / Korkhov VM | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structures of wild-type and selected CMT1X mutant connexin 32 gap junction channels and hemichannels. Authors: Chao Qi / Pia Lavriha / Erva Bayraktar / Anand Vaithia / Dina Schuster / Micaela Pannella / Valentina Sala / Paola Picotti / Mario Bortolozzi / Volodymyr M Korkhov / ![]() ![]() Abstract: In myelinating Schwann cells, connection between myelin layers is mediated by gap junction channels (GJCs) formed by docked connexin 32 (Cx32) hemichannels (HCs). Mutations in Cx32 cause the X-linked ...In myelinating Schwann cells, connection between myelin layers is mediated by gap junction channels (GJCs) formed by docked connexin 32 (Cx32) hemichannels (HCs). Mutations in Cx32 cause the X-linked Charcot-Marie-Tooth disease (CMT1X), a degenerative neuropathy without a cure. A molecular link between Cx32 dysfunction and CMT1X pathogenesis is still missing. Here, we describe the high-resolution cryo-electron cryo-myography (cryo-EM) structures of the Cx32 GJC and HC, along with two CMT1X-linked mutants, W3S and R22G. While the structures of wild-type and mutant GJCs are virtually identical, the HCs show a major difference: In the W3S and R22G mutant HCs, the amino-terminal gating helix partially occludes the pore, consistent with a diminished HC activity. Our results suggest that HC dysfunction may be involved in the pathogenesis of CMT1X. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 21.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14 KB 14 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 13.7 KB | Display | ![]() |
Images | ![]() | 86.5 KB | ||
Masks | ![]() | 216 MB | ![]() | |
Filedesc metadata | ![]() | 5.3 KB | ||
Others | ![]() ![]() | 202.3 MB 202 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7zxnMC ![]() 7zxmC ![]() 7zxoC ![]() 7zxpC ![]() 7zxqC ![]() 7zxtC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Map
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Voxel size | X=Y=Z: 0.654 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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-Half map: #2
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Sample components
-Entire : Connexin32 gap junction channel complex
Entire | Name: Connexin32 gap junction channel complex |
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Components |
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-Supramolecule #1: Connexin32 gap junction channel complex
Supramolecule | Name: Connexin32 gap junction channel complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 32 kDa/nm |
-Macromolecule #1: Gap junction beta-1 protein
Macromolecule | Name: Gap junction beta-1 protein / type: protein_or_peptide / ID: 1 / Number of copies: 6 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 32.065533 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MNWTGLYTLL SGVNRHSTAI GRVWLSVIFI FRIMVLVVAA ESVWGDEKSS FICNTLQPGC NSVCYDQFFP ISHVRLWSLQ LILVSTPAL LVAMHVAHQQ HIEKKMLRLE GHGDPLHLEE VKRHKVHISG TLWWTYVISV VFRLLFEAVF MYVFYLLYPG Y AMVRLVKC ...String: MNWTGLYTLL SGVNRHSTAI GRVWLSVIFI FRIMVLVVAA ESVWGDEKSS FICNTLQPGC NSVCYDQFFP ISHVRLWSLQ LILVSTPAL LVAMHVAHQQ HIEKKMLRLE GHGDPLHLEE VKRHKVHISG TLWWTYVISV VFRLLFEAVF MYVFYLLYPG Y AMVRLVKC DVYPCPNTVD CFVSRPTEKT VFTVFMLAAS GICIILNVAE VVYLIIRACA RRAQRRSNPP SRKGSGFGHR LS PEYKQNE INKLLSEQDG SLKDILRRSP GTGAGLAEKS DRCSAC UniProtKB: Gap junction beta-1 protein |
-Macromolecule #2: CHOLESTEROL
Macromolecule | Name: CHOLESTEROL / type: ligand / ID: 2 / Number of copies: 6 / Formula: CLR |
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Molecular weight | Theoretical: 386.654 Da |
Chemical component information | ![]() ChemComp-CLR: |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Buffer | pH: 8 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD![]() |
Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |