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- EMDB-33979: Cryo-EM structure of RCK1-RCK2 mutated human Slo1 apo -

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Basic information

Entry
Database: EMDB / ID: EMD-33979
TitleCryo-EM structure of RCK1-RCK2 mutated human Slo1 apo
Map data
Sample
  • Complex: human Slo1-LRRC26 complex
    • Protein or peptide: Calcium-activated potassium channel subunit alpha-1
KeywordsTRANSPORT PROTEIN
Function / homology
Function and homology information


monoatomic ion channel complex / potassium channel activity / metal ion binding / 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 / Regulator of K+ conductance, N-terminal / 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: 3.3 Å
AuthorsYamanouchi D / Nureki O
Funding support Japan, 1 items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: To Be Published
Title: Structural basis for dual allosteric gating modulation of Slo1-LRRC channel complex
Authors: Yamanouchi D
History
DepositionAug 1, 2022-
Header (metadata) releaseMar 6, 2024-
Map releaseMar 6, 2024-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_33979.png

Downloads & links

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Map

FileDownload / File: emd_33979.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 300 pix.
= 298.8 Å		1 Å/pix.
x 300 pix.
= 298.8 Å		1 Å/pix.
x 300 pix.
= 298.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.996 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0276
Minimum - Maximum-0.07036991 - 0.13901432
Average (Standard dev.)0.00028615122 (±0.00597697)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 298.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_33979_msk_1.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_33979_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #2

Fileemd_33979_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : human Slo1-LRRC26 complex

EntireName: human Slo1-LRRC26 complex
Components
  • Complex: human Slo1-LRRC26 complex
    • Protein or peptide: Calcium-activated potassium channel subunit alpha-1

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Supramolecule #1: human Slo1-LRRC26 complex

SupramoleculeName: human Slo1-LRRC26 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 616 kDa/nm

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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: 118.877008 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 LNRSWLGLRF LRALRLIQFS EILQFLNILK TSNSIKLVNL LS IFISTWL TAAGFIHLVE NSGDPWENFQ NNQALTYWEC VYLLMVTMST VGYGDVYAKT TLGRLFMVFF ILGGLAMFAS YVP EIIELI GNRKKYGGSY SAVSGRKHIV VCGHITLESV SNFLKAFLHK ARDDVNVEIV 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 FLDQNNNNNP DTELYLTQPF ACGTAFAVSV LDSLMSATYF NDNILTLIRT LVTGGATPEL EALIAEENAL R GGYSTPQT LANRDRCRVA QLALLDGPFA DLGDGGCYGD LFCKALKTYN MLCFGIYRLR DAHLSTPSQC TKRYVITNPP YE FELVPTD LIFCLMQFD

UniProtKB: Calcium-activated potassium channel subunit alpha-1

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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

Concentration2.0 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 48.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 137782
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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