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- EMDB-41193: Shaker in low K+ (4mM K+) -

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Basic information

Entry
Database: EMDB / ID: EMD-41193
TitleShaker in low K+ (4mM K+)
Map data
Sample
  • Cell: voltage-gated potassium channel Shaker
    • Protein or peptide: Potassium voltage-gated channel protein ShakerVoltage-gated potassium channel
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: POTASSIUM IONPotassium
  • Ligand: water
Keywordsvoltage-gated potassium channel / MEMBRANE PROTEIN
Function / homology
Function and homology information


mating behavior, sex discrimination / Phase 3 - rapid repolarisation / behavioral response to ether / Voltage gated Potassium channels / proboscis extension reflex / larval locomotory behavior / regulation of synaptic activity / courtship behavior / positive regulation of membrane potential / positive regulation of circadian sleep/wake cycle, sleep ...mating behavior, sex discrimination / Phase 3 - rapid repolarisation / behavioral response to ether / Voltage gated Potassium channels / proboscis extension reflex / larval locomotory behavior / regulation of synaptic activity / courtship behavior / positive regulation of membrane potential / positive regulation of circadian sleep/wake cycle, sleep / regulation of circadian sleep/wake cycle, sleep / detection of visible light / delayed rectifier potassium channel activity / sleep / cellular response to dopamine / voltage-gated monoatomic cation channel activity / axon extension / action potential / voltage-gated potassium channel activity / voltage-gated potassium channel complex / potassium ion transmembrane transport / protein homooligomerization / potassium ion transport / sensory perception of taste / learning or memory / membrane
Similarity search - Function
Potassium channel, voltage dependent, Kv1 / Potassium channel, voltage dependent, Kv / Potassium channel tetramerisation-type BTB domain / BTB/POZ domain / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / Voltage-dependent channel domain superfamily / SKP1/BTB/POZ domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Potassium voltage-gated channel protein Shaker
Similarity search - Component
Biological speciesDrosophila melanogaster (fruit fly)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.39 Å
AuthorsTan X / Swartz KJ
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) United States
CitationJournal: Sci Adv / Year: 2023
Title: Eukaryotic Kv channel Shaker inactivates through selectivity filter dilation rather than collapse.
Authors: Robyn Stix / Xiao-Feng Tan / Chanhyung Bae / Ana I Fernández-Mariño / Kenton J Swartz / José D Faraldo-Gómez /
Abstract: Eukaryotic voltage-gated K channels have been extensively studied, but the structural bases for some of their most salient functional features remain to be established. C-type inactivation, for ...Eukaryotic voltage-gated K channels have been extensively studied, but the structural bases for some of their most salient functional features remain to be established. C-type inactivation, for example, is an auto-inhibitory mechanism that confers temporal resolution to their signal-firing activity. In a recent breakthrough, studies of a mutant of Shaker that is prone to inactivate indicated that this process entails a dilation of the selectivity filter, the narrowest part of the ion conduction pathway. Here, we report an atomic-resolution cryo-electron microscopy structure that demonstrates that the wild-type channel can also adopt this dilated state. All-atom simulations corroborate this conformation is congruent with the electrophysiological characteristics of the C-type inactivated state, namely, residual K conductance and altered ion specificity, and help rationalize why inactivation is accelerated or impeded by certain mutations. In summary, this study establishes the molecular basis for an important self-regulatory mechanism in eukaryotic K channels, laying a solid foundation for further studies.
History
DepositionJul 6, 2023-
Header (metadata) releaseDec 20, 2023-
Map releaseDec 20, 2023-
UpdateDec 20, 2023-
Current statusDec 20, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41193.png

Downloads & links

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Map

FileDownload / File: emd_41193.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.83 Å
Density
Contour LevelBy AUTHOR: 0.006
Minimum - Maximum-0.032749545 - 0.10346093
Average (Standard dev.)-0.00003114283 (±0.0012620516)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 249.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_41193_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_41193_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : voltage-gated potassium channel Shaker

EntireName: voltage-gated potassium channel Shaker
Components
  • Cell: voltage-gated potassium channel Shaker
    • Protein or peptide: Potassium voltage-gated channel protein ShakerVoltage-gated potassium channel
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: POTASSIUM IONPotassium
  • Ligand: water

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Supramolecule #1: voltage-gated potassium channel Shaker

SupramoleculeName: voltage-gated potassium channel Shaker / type: cell / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Drosophila melanogaster (fruit fly)

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Macromolecule #1: Potassium voltage-gated channel protein Shaker

MacromoleculeName: Potassium voltage-gated channel protein Shaker / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 74.525953 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: GTMAAVAGLY GLGEDRQHRK KQQQQQQHQK EQLEQKEEQK KIAERKLQLR EQQLQRNSLD GYGSLPKLSS QDEEGGAGHG FGGGPQHFE PIPHDHDFCE RVVINVSGLR FETQLRTLNQ FPDTLLGDPA RRLRYFDPLR NEYFFDRSRP SFDAILYYYQ S GGRLRRPV ...String:
GTMAAVAGLY GLGEDRQHRK KQQQQQQHQK EQLEQKEEQK KIAERKLQLR EQQLQRNSLD GYGSLPKLSS QDEEGGAGHG FGGGPQHFE PIPHDHDFCE RVVINVSGLR FETQLRTLNQ FPDTLLGDPA RRLRYFDPLR NEYFFDRSRP SFDAILYYYQ S GGRLRRPV NVPLDVFSEE IKFYELGDQA INKFREDEGF IKEEERPLPD NEKQRKVWLL FEYPESSQAA RVVAIISVFV IL LSIVIFC LETLPEFKHY KVFNTTTNGT KIEEDEVPDI TDPFFLIETL CIIWFTFELT VRFLACPNKL NFCRDVMNVI DII AIIPYF ITLATVVAEE EDTLNLPKAP VSPQDKSSNQ AMSLAILRVI RLVRVFRIFK LSRHSKGLQI LGRTLKASMR ELGL LIFFL FIGVVLFSSA VYFAEAGSEN SFFKSIPDAF WWAVVTMTTV GYGDMTPVGV WGKIVGSLCA IAGVLTIALP VPVIV SNFN YFYHRETDQE EMQSQNFNHV TSCPYLPGTL VGQHMKKSSL SESSSDMMDL DDGVESTPGL TETHPGRSAV APFLGA QQQ QQQPVASSLS MSIDKQLQHP LQQLTQTQLY QQQQQQQQQQ QNGFKQQQQQ TQQQLQQQQS HTINASAAAA TSGSGSS GL TMRHNNALAV SIETDV

UniProtKB: Potassium voltage-gated channel protein Shaker

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Macromolecule #2: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 2 / Number of copies: 32 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM / POPC

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Macromolecule #3: POTASSIUM ION

MacromoleculeName: POTASSIUM ION / type: ligand / ID: 3 / Number of copies: 2 / Formula: K
Molecular weightTheoretical: 39.098 Da

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Macromolecule #4: water

MacromoleculeName: water / type: ligand / ID: 4 / Number of copies: 9 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration4.5 mg/mL
BufferpH: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 289 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 52.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.39 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 663447

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