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- EMDB-42988: R207A mutant of human Slo1 in presence of EDTA - activated VSD -

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Basic information

Entry
Database: EMDB / ID: EMD-42988
TitleR207A mutant of human Slo1 in presence of EDTA - activated VSD
Map dataunsharpened map
Sample
  • Complex: Slo1 channel mutant R207A in presence of EDTA with an activated VSD
    • Protein or peptide: Calcium-activated potassium channel subunit alpha-1
  • Ligand: POTASSIUM ION
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: CHOLESTEROL
  • Ligand: Digitonin
  • Ligand: water
KeywordsSlo1 / BK / maxiK / potassium channel / voltage sensor / VSD / activated state / TRANSPORT PROTEIN
Function / homology
Function and homology information


Acetylcholine inhibits contraction of outer hair cells / Ca2+ activated K+ channels / micturition / response to carbon monoxide / large conductance calcium-activated potassium channel activity / calcium-activated potassium channel activity / negative regulation of cell volume / smooth muscle contraction involved in micturition / intracellular potassium ion homeostasis / Sensory processing of sound by inner hair cells of the cochlea ...Acetylcholine inhibits contraction of outer hair cells / Ca2+ activated K+ channels / micturition / response to carbon monoxide / large conductance calcium-activated potassium channel activity / calcium-activated potassium channel activity / negative regulation of cell volume / 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 / voltage-gated potassium channel complex / potassium ion transmembrane transport / regulation of membrane potential / potassium ion transport / caveola / response to calcium ion / vasodilation / actin binding / postsynaptic membrane / response to hypoxia / apical plasma membrane / positive regulation of apoptotic process / metal ion binding / identical protein binding / membrane / plasma membrane
Similarity search - Function
: / Ca2+-activated K+ channel Slowpoke, TrkA_C like domain / Calcium-activated potassium channel BK, alpha subunit / : / : / Calcium-activated BK potassium channel alpha subunit / Calcium-activated potassium channel slowpoke-like RCK domain / RCK N-terminal domain profile. / Ion transport domain / Ion transport protein / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
Calcium-activated potassium channel subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.72 Å
AuthorsPal K / Kallure GS / Chowdhury S
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01GM145719 United States
CitationJournal: To Be Published
Title: R207A mutant of human Slo1 in presence of EDTA - activated VSD
Authors: Pal K / Kallure GS / Chowdhury S
History
DepositionDec 1, 2023-
Header (metadata) releaseDec 11, 2024-
Map releaseDec 11, 2024-
UpdateMay 21, 2025-
Current statusMay 21, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_42988.png

Downloads & links

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Map

FileDownload / File: emd_42988.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationunsharpened map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 256 pix.
= 276.48 Å		1.08 Å/pix.
x 256 pix.
= 276.48 Å		1.08 Å/pix.
x 256 pix.
= 276.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.085
Minimum - Maximum-0.20673399 - 0.5282643
Average (Standard dev.)0.006108467 (±0.023960251)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 276.48 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: Sharpened map

Fileemd_42988_additional_1.map
AnnotationSharpened map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map A

Fileemd_42988_half_map_1.map
AnnotationHalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B

Fileemd_42988_half_map_2.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Slo1 channel mutant R207A in presence of EDTA with an activated VSD

EntireName: Slo1 channel mutant R207A in presence of EDTA with an activated VSD
Components
  • Complex: Slo1 channel mutant R207A in presence of EDTA with an activated VSD
    • Protein or peptide: Calcium-activated potassium channel subunit alpha-1
  • Ligand: POTASSIUM ION
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: CHOLESTEROL
  • Ligand: Digitonin
  • Ligand: water

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Supramolecule #1: Slo1 channel mutant R207A in presence of EDTA with an activated VSD

SupramoleculeName: Slo1 channel mutant R207A in presence of EDTA with an activated VSD
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Calcium-activated potassium channel subunit alpha-1

MacromoleculeName: Calcium-activated potassium channel subunit alpha-1 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 119.901953 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: 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 LNRSWLGLAF 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

UniProtKB: Calcium-activated potassium channel subunit alpha-1

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Macromolecule #2: POTASSIUM ION

MacromoleculeName: POTASSIUM ION / type: ligand / ID: 2 / Number of copies: 9 / Formula: K
Molecular weightTheoretical: 39.098 Da

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Macromolecule #3: (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: 3 / Number of copies: 28 / 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

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Macromolecule #4: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 4 / Number of copies: 4 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #5: Digitonin

MacromoleculeName: Digitonin / type: ligand / ID: 5 / Number of copies: 40 / Formula: AJP
Molecular weightTheoretical: 1.229312 KDa
Chemical component information

ChemComp-AJP:
Digitonin / detergent*YM

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Macromolecule #6: water

MacromoleculeName: water / type: ligand / ID: 6 / Number of copies: 8 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
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

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 72.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.7 µm / Nominal defocus min: 0.9 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.72 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 202456
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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