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- PDB-7xkk: Human Cx36/GJD2 gap junction channel in detergents -

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Basic information

Entry
Database: PDB / ID: 7xkk
TitleHuman Cx36/GJD2 gap junction channel in detergents
ComponentsGap junction delta-2 protein
KeywordsMEMBRANE PROTEIN / Connexin 36 / Cx36 / Gap Junction Channel / GJD2
Function / homology
Function and homology information


Electric Transmission Across Gap Junctions / connexin complex / Gap junction assembly / gap junction channel activity / neuronal action potential / visual perception / cell-cell signaling / chemical synaptic transmission / synapse / plasma membrane
Similarity search - Function
Gap junction delta-2 protein (Cx36) / Connexin / Connexin, N-terminal / Connexin, conserved site / Gap junction protein, cysteine-rich domain / Connexin, N-terminal domain superfamily / Connexin / Connexins signature 1. / Connexins signature 2. / Connexin homologues / Gap junction channel protein cysteine-rich domain
Similarity search - Domain/homology
Gap junction delta-2 protein
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsLee, S.N. / Cho, H.J. / Jeong, H. / Ryu, B. / Lee, H.J. / Lee, H.H. / Woo, J.S.
Funding support Korea, Republic Of, 2items
OrganizationGrant numberCountry
National Research Foundation (NRF, Korea)2018R1C1B6004447 Korea, Republic Of
National Research Foundation (NRF, Korea)2022R1A2B5B02002529 Korea, Republic Of
CitationJournal: Nat Commun / Year: 2023
Title: Cryo-EM structures of human Cx36/GJD2 neuronal gap junction channel.
Authors: Seu-Na Lee / Hwa-Jin Cho / Hyeongseop Jeong / Bumhan Ryu / Hyuk-Joon Lee / Minsoo Kim / Jejoong Yoo / Jae-Sung Woo / Hyung Ho Lee /
Abstract: Connexin 36 (Cx36) is responsible for signal transmission in electrical synapses by forming interneuronal gap junctions. Despite the critical role of Cx36 in normal brain function, the molecular ...Connexin 36 (Cx36) is responsible for signal transmission in electrical synapses by forming interneuronal gap junctions. Despite the critical role of Cx36 in normal brain function, the molecular architecture of the Cx36 gap junction channel (GJC) is unknown. Here, we determine cryo-electron microscopy structures of Cx36 GJC at 2.2-3.6 Å resolutions, revealing a dynamic equilibrium between its closed and open states. In the closed state, channel pores are obstructed by lipids, while N-terminal helices (NTHs) are excluded from the pore. In the open state with pore-lining NTHs, the pore is more acidic than those in Cx26 and Cx46/50 GJCs, explaining its strong cation selectivity. The conformational change during channel opening also includes the α-to-π-helix transition of the first transmembrane helix, which weakens the protomer-protomer interaction. Our structural analyses provide high resolution information on the conformational flexibility of Cx36 GJC and suggest a potential role of lipids in the channel gating.
History
DepositionApr 19, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 26, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Gap junction delta-2 protein
B: Gap junction delta-2 protein
C: Gap junction delta-2 protein
D: Gap junction delta-2 protein
E: Gap junction delta-2 protein
F: Gap junction delta-2 protein
G: Gap junction delta-2 protein
H: Gap junction delta-2 protein
I: Gap junction delta-2 protein
J: Gap junction delta-2 protein
K: Gap junction delta-2 protein
L: Gap junction delta-2 protein


Theoretical massNumber of molelcules
Total (without water)448,95812
Polymers448,95812
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Gap junction delta-2 protein / Connexin-36 / Cx36 / Gap junction alpha-9 protein


Mass: 37413.137 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GJD2, GJA9 / Production host: Homo sapiens (human) / References: UniProt: Q9UKL4
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Cx36 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

Software
NameVersionClassificationNB
phenix.real_space_refine1.17.1_3660refinement
PHENIX1.17.1_3660refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 51480 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 30.54 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.006116452
ELECTRON MICROSCOPYf_angle_d0.820222380
ELECTRON MICROSCOPYf_chiral_restr0.04772592
ELECTRON MICROSCOPYf_plane_restr0.00472760
ELECTRON MICROSCOPYf_dihedral_angle_d27.50475784

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