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- PDB-8xo1: Human KCNQ2-CaM in complex with QO-83 -

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Basic information

Entry
Database: PDB / ID: 8xo1
TitleHuman KCNQ2-CaM in complex with QO-83
Components
  • Calmodulin-1
  • Potassium voltage-gated channel subfamily KQT member 2
KeywordsMEMBRANE PROTEIN / KCNQ2 / human voltage-gated potassium channel
Function / homology
Function and homology information


axon initial segment / Voltage gated Potassium channels / node of Ranvier / voltage-gated monoatomic cation channel activity / CaM pathway / Cam-PDE 1 activation / Interaction between L1 and Ankyrins / Sodium/Calcium exchangers / ankyrin binding / Calmodulin induced events ...axon initial segment / Voltage gated Potassium channels / node of Ranvier / voltage-gated monoatomic cation channel activity / CaM pathway / Cam-PDE 1 activation / Interaction between L1 and Ankyrins / Sodium/Calcium exchangers / ankyrin binding / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / CaMK IV-mediated phosphorylation of CREB / PKA activation / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of cardiac muscle cell action potential / presynaptic endocytosis / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / action potential / regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / Long-term potentiation / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / voltage-gated potassium channel activity / catalytic complex / Smooth Muscle Contraction / detection of calcium ion / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / cellular response to interferon-beta / Protein methylation / calcium channel inhibitor activity / Activation of AMPK downstream of NMDARs / presynaptic cytosol / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / titin binding / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / FCERI mediated Ca+2 mobilization / substantia nigra development / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / FCGR3A-mediated IL10 synthesis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / calyx of Held / adenylate cyclase activator activity / sarcomere / VEGFR2 mediated cell proliferation / protein serine/threonine kinase activator activity / VEGFR2 mediated vascular permeability / regulation of cytokinesis / spindle microtubule / calcium channel regulator activity / Translocation of SLC2A4 (GLUT4) to the plasma membrane / positive regulation of receptor signaling pathway via JAK-STAT / RAF activation / Transcriptional activation of mitochondrial biogenesis / response to calcium ion / cellular response to type II interferon / Stimuli-sensing channels / G2/M transition of mitotic cell cycle / long-term synaptic potentiation / spindle pole / RAS processing / Signaling by RAF1 mutants / calcium-dependent protein binding / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / Signaling by BRAF and RAF1 fusions / Inactivation, recovery and regulation of the phototransduction cascade / Platelet degranulation
Similarity search - Function
Potassium channel, voltage dependent, KCNQ2 / Ankyrin-G binding site / Ankyrin-G binding motif of KCNQ2-3 / Unstructured region on Potassium channel subunit alpha KvLQT2 / Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / : / EF-hand domain pair / EF-hand, calcium binding motif ...Potassium channel, voltage dependent, KCNQ2 / Ankyrin-G binding site / Ankyrin-G binding motif of KCNQ2-3 / Unstructured region on Potassium channel subunit alpha KvLQT2 / Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / : / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein / EF-hand domain pair
Similarity search - Domain/homology
: / Potassium voltage-gated channel subfamily KQT member 2 / Calmodulin-1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsZhao, Y.W. / Yang, Z.N. / Guo, J.T. / Du, X.N.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)U21A20359 China
CitationJournal: To Be Published
Title: Human KCNQ2-CaM in complex with QO-83
Authors: Zhao, Y.W.
History
DepositionDec 31, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 1, 2025Provider: repository / Type: Initial release
Revision 1.0Jan 1, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jan 1, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 1, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 1, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jan 1, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jun 18, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 18, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Potassium voltage-gated channel subfamily KQT member 2
H: Calmodulin-1
B: Potassium voltage-gated channel subfamily KQT member 2
C: Calmodulin-1
D: Potassium voltage-gated channel subfamily KQT member 2
E: Calmodulin-1
F: Potassium voltage-gated channel subfamily KQT member 2
G: Calmodulin-1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)453,01112
Polymers451,3178
Non-polymers1,6944
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Potassium voltage-gated channel subfamily KQT member 2 / KQT-like 2 / Neuroblastoma-specific potassium channel subunit alpha KvLQT2 / Voltage-gated ...KQT-like 2 / Neuroblastoma-specific potassium channel subunit alpha KvLQT2 / Voltage-gated potassium channel subunit Kv7.2


Mass: 95976.742 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line: HEK293F / Gene: KCNQ2 / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: O43526
#2: Protein
Calmodulin-1


Mass: 16852.545 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CALM1, CALM, CAM, CAM1 / Production host: Homo sapiens (human) / References: UniProt: P0DP23
#3: Chemical
ChemComp-A1LWZ / ~{N}-[2-azanyl-3-fluoranyl-4-[[4-(trifluoromethyl)phenyl]methylamino]phenyl]-3-cyclopentyl-propanamide


Mass: 423.447 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C22H25F4N3O / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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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: human KCNQ2-CaM in complex with QO-83 / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
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: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 52 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 73879 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00316564
ELECTRON MICROSCOPYf_angle_d0.62422356
ELECTRON MICROSCOPYf_dihedral_angle_d5.1892236
ELECTRON MICROSCOPYf_chiral_restr0.0342448
ELECTRON MICROSCOPYf_plane_restr0.0052816

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