+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-21025 | |||||||||
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Title | Cryo-EM structure of Ca2+-bound hsSlo1-beta4 channel complex | |||||||||
Map data | Cryo-EM map of Ca2 -bound hsSlo1_beta4 channel complex | |||||||||
Sample |
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Function / homology | Function and homology information Acetylcholine inhibits contraction of outer hair cells / micturition / Ca2+ activated K+ channels / large conductance calcium-activated potassium channel activity / response to carbon monoxide / calcium-activated potassium channel activity / negative regulation of cell volume / regulation of neurotransmitter secretion / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / smooth muscle contraction involved in micturition ...Acetylcholine inhibits contraction of outer hair cells / micturition / Ca2+ activated K+ channels / large conductance calcium-activated potassium channel activity / response to carbon monoxide / calcium-activated potassium channel activity / negative regulation of cell volume / regulation of neurotransmitter secretion / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / smooth muscle contraction involved in micturition / intracellular potassium ion homeostasis / Sensory processing of sound by inner hair cells of the cochlea / response to osmotic stress / cGMP effects / voltage-gated potassium channel activity / action potential / neuronal action potential / detection of calcium ion / regulation of vasoconstriction / potassium channel regulator activity / voltage-gated potassium channel complex / potassium ion transmembrane transport / regulation of membrane potential / caveola / potassium ion transport / response to calcium ion / vasodilation / actin binding / chemical synaptic transmission / postsynaptic membrane / response to hypoxia / positive regulation of apoptotic process / apical plasma membrane / synapse / identical protein binding / membrane / metal ion binding / plasma membrane Similarity search - Function | |||||||||
Biological species | Homo sapiens (human) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
Authors | Tao X / MacKinnon R | |||||||||
Funding support | United States, 1 items
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Citation | Journal: Elife / Year: 2019 Title: Molecular structures of the human Slo1 K channel in complex with β4. Authors: Xiao Tao / Roderick MacKinnon / Abstract: Slo1 is a Ca- and voltage-activated K channel that underlies skeletal and smooth muscle contraction, audition, hormone secretion and neurotransmitter release. In mammals, Slo1 is regulated by ...Slo1 is a Ca- and voltage-activated K channel that underlies skeletal and smooth muscle contraction, audition, hormone secretion and neurotransmitter release. In mammals, Slo1 is regulated by auxiliary proteins that confer tissue-specific gating and pharmacological properties. This study presents cryo-EM structures of Slo1 in complex with the auxiliary protein, β4. Four β4, each containing two transmembrane helices, encircle Slo1, contacting it through helical interactions inside the membrane. On the extracellular side, β4 forms a tetrameric crown over the pore. Structures with high and low Ca concentrations show that identical gating conformations occur in the absence and presence of β4, implying that β4 serves to modulate the relative stabilities of 'pre-existing' conformations rather than creating new ones. The effects of β4 on scorpion toxin inhibition kinetics are explained by the crown, which constrains access but does not prevent binding. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_21025.map.gz | 157.3 MB | EMDB map data format | |
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Header (meta data) | emd-21025-v30.xml emd-21025.xml | 19.4 KB 19.4 KB | Display Display | EMDB header |
Images | emd_21025.png | 153.7 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-21025 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-21025 | HTTPS FTP |
-Related structure data
Related structure data | 6v22MC 6v35C 6v38C 6v3gC C: citing same article (ref.) M: atomic model generated by this map |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_21025.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Cryo-EM map of Ca2 -bound hsSlo1_beta4 channel complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.04 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
-Entire : hsSlo1 alpha subunit-beta4 subunit complex
Entire | Name: hsSlo1 alpha subunit-beta4 subunit complex |
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Components |
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-Supramolecule #1: hsSlo1 alpha subunit-beta4 subunit complex
Supramolecule | Name: hsSlo1 alpha subunit-beta4 subunit complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 Details: human high conductance Ca2+-activated K+ channel Slo1 (BK) alpha subunit and beta4 subunit |
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Source (natural) | Organism: Homo sapiens (human) |
Recombinant expression | Organism: Homo sapiens (human) / Recombinant cell: HEK293S GnTI- |
Molecular weight | Theoretical: 580 KDa |
-Macromolecule #1: Calcium-activated potassium channel subunit alpha-1
Macromolecule | Name: Calcium-activated potassium channel subunit alpha-1 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 119.988062 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MDALIIPVTM EVPCDSRGQR MWWAFLASSM VTFFGGLFII LLWRTLKYLW TVCCHCGGKT KEAQKINNGS SQADGTLKPV DEKEEAVAA EVGWMTSVKD WAGVMISAQT LTGRVLVVLV FALSIGALVI YFIDSSNPIE SCQNFYKDFT LQIDMAFNVF F LLYFGLRF ...String: MDALIIPVTM EVPCDSRGQR MWWAFLASSM VTFFGGLFII LLWRTLKYLW TVCCHCGGKT KEAQKINNGS SQADGTLKPV DEKEEAVAA EVGWMTSVKD WAGVMISAQT LTGRVLVVLV FALSIGALVI YFIDSSNPIE SCQNFYKDFT LQIDMAFNVF F LLYFGLRF IAANDKLWFW LEVNSVVDFF TVPPVFVSVY LNRSWLGLRF LRALRLIQFS EILQFLNILK TSNSIKLVNL LS IFISTWL TAAGFIHLVE NSGDPWENFQ NNQALTYWEC VYLLMVTMST VGYGDVYAKT TLGRLFMVFF ILGGLAMFAS YVP EIIELI GNRKKYGGSY SAVSGRKHIV VCGHITLESV SNFLKDFLHK DRDDVNVEIV FLHNISPNLE LEALFKRHFT QVEF YQGSV LNPHDLARVK IESADACLIL ANKYCADPDA EDASNIMRVI SIKNYHPKIR IITQMLQYHN KAHLLNIPSW NWKEG DDAI CLAELKLGFI AQSCLAQGLS TMLANLFSMR SFIKIEEDTW QKYYLEGVSN EMYTEYLSSA FVGLSFPTVC ELCFVK LKL LMIAIEYKSA NRESRILINP GNHLKIQEGT LGFFIASDAK EVKRAFFYCK ACHDDITDPK RIKKCGCKRL EDEQPST LS PKKKQRNGGM RNSPNTSPKL MRHDPLLIPG NDQIDNMDSN VKKYDSTGMF HWCAPKEIEK VILTRSEAAM TVLSGHVV V CIFGDVSSAL IGLRNLVMPL RASNFHYHEL KHIVFVGSIE YLKREWETLH NFPKVSILPG TPLSRADLRA VNINLCDMC VILSANQNNI DDTSLQDKEC ILASLNIKSM QFDDSIGVLQ ANSQGFTPPG MDRSSPDNSP VHGMLRQPSI TTGVNIPIIT ELVNDTNVQ FLDQDDDDDP DTELYLTQPF ACGTAFAVSV LDSLMSATYF NDNILTLIRT LVTGGATPEL EALIAEENAL R GGYSTPQT LANRDRCRVA QLALLDGPFA DLGDGGCYGD LFCKALKTYN MLCFGIYRLR DAHLSTPSQC TKRYVITNPP YE FELVPTD LIFCLMQFDS NSLEVLFQ |
-Macromolecule #2: Calcium-activated potassium channel subunit beta-4
Macromolecule | Name: Calcium-activated potassium channel subunit beta-4 / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 24.991756 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MAKLRVAYEY TEAEDKSIRL GLFLIISGVV SLFIFGFCWL SPALQDLQAT EANCTVLSVQ QIGEVFECTF TCGADCRGTS QYPCVQVYV NNSESNSRAL LHSDEHQLLT NPKCSYIPPC KRENQKNLES VMNWQQYWKD EIGSQPFTCY FNQHQRPDDV L LHRTHDEI ...String: MAKLRVAYEY TEAEDKSIRL GLFLIISGVV SLFIFGFCWL SPALQDLQAT EANCTVLSVQ QIGEVFECTF TCGADCRGTS QYPCVQVYV NNSESNSRAL LHSDEHQLLT NPKCSYIPPC KRENQKNLES VMNWQQYWKD EIGSQPFTCY FNQHQRPDDV L LHRTHDEI VLLHCFLWPL VTFVVGVLIV VLTICAKSLA VKAEAMKKRK FSSNSLEVLF Q |
-Macromolecule #3: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 4 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Macromolecule #4: CALCIUM ION
Macromolecule | Name: CALCIUM ION / type: ligand / ID: 4 / Number of copies: 8 / Formula: CA |
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Molecular weight | Theoretical: 40.078 Da |
-Macromolecule #5: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...
Macromolecule | Name: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate type: ligand / ID: 5 / Number of copies: 60 / Formula: POV |
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Molecular weight | Theoretical: 760.076 Da |
Chemical component information | ChemComp-POV: |
-Macromolecule #6: CHOLESTEROL
Macromolecule | Name: CHOLESTEROL / type: ligand / ID: 6 / Number of copies: 16 / Formula: CLR |
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Molecular weight | Theoretical: 386.654 Da |
Chemical component information | ChemComp-CLR: |
-Macromolecule #7: POTASSIUM ION
Macromolecule | Name: POTASSIUM ION / type: ligand / ID: 7 / Number of copies: 4 / Formula: K |
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Molecular weight | Theoretical: 39.098 Da |
-Macromolecule #8: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 8 / Number of copies: 8 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ChemComp-NAG: |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 8.5 mg/mL | ||||||||||||||||||
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Buffer | pH: 8 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR | ||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV / Details: Blot for 4 seconds before plunging.. |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-50 / Number grids imaged: 1 / Number real images: 5410 / Average exposure time: 10.0 sec. / Average electron dose: 74.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | C2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.7 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
+Image processing
-Atomic model buiding 1
Initial model | (PDB ID: , ) |
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Refinement | Space: REAL / Protocol: RIGID BODY FIT |
Output model | PDB-6v22: |
-Atomic model buiding 2
Refinement | Space: REAL / Protocol: AB INITIO MODEL |
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Output model | PDB-6v22: |