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- EMDB-77227: cAMP-bound SthK monomer from symmetry expanded particles - POPE c... -

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Basic information

Entry
Database: EMDB / ID: EMD-77227
TitlecAMP-bound SthK monomer from symmetry expanded particles - POPE class 2
Map datarefined map
Sample
  • Complex: tetrameric SthK protein
    • Protein or peptide: Putative transcriptional regulator, Crp/Fnr family
  • Ligand: ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE
Keywordstrans-membrane protein ion channel cyclic nucleotide-gated channel / MEMBRANE PROTEIN
Function / homology
Function and homology information


intracellularly cyclic nucleotide-activated monoatomic cation channel activity / protein-containing complex binding / membrane
Similarity search - Function
: / Cyclic nucleotide-binding domain signature 2. / Cyclic nucleotide-binding domain signature 1. / Cyclic nucleotide-binding, conserved site / Potassium channel domain / Ion channel / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain / cAMP/cGMP binding motif profile. / Cyclic nucleotide-binding domain ...: / Cyclic nucleotide-binding domain signature 2. / Cyclic nucleotide-binding domain signature 1. / Cyclic nucleotide-binding, conserved site / Potassium channel domain / Ion channel / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain / cAMP/cGMP binding motif profile. / Cyclic nucleotide-binding domain / Cyclic nucleotide-binding domain superfamily / RmlC-like jelly roll fold
Similarity search - Domain/homology
Transcriptional regulator, Crp/Fnr family
Similarity search - Component
Biological speciesSpirochaeta thermophila (bacteria) / Winmispira thermophila DSM 6578 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.66 Å
AuthorsSchmidpeter PA / Newton AJ
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM159863 United States
CitationJournal: Nat Commun / Year: 2026
Title: Concentration-dependent switching between ligand-like and solvent-like lipid regulation in a model ion channel
Authors: Newton AJ / Kuforiji AE / Schmidpeter PA
History
DepositionMay 19, 2026-
Header (metadata) releaseOct 14, 2026-
Map releaseOct 14, 2026-
UpdateOct 14, 2026-
Current statusOct 14, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_77227.png

Downloads & links

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Map

FileDownload / File: emd_77227.map.gz / Format: CCP4 / Size: 147.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationrefined map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.8 Å/pix.
x 338 pix.
= 270.4 Å		0.8 Å/pix.
x 338 pix.
= 270.4 Å		0.8 Å/pix.
x 338 pix.
= 270.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.00504
Minimum - Maximum-0.007917786 - 0.0216264
Average (Standard dev.)0.000059597794 (±0.0006298359)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions338338338
Spacing338338338
CellA=B=C: 270.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_77227_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: postprocessed map using a B-factor of -40

Fileemd_77227_additional_1.map
Annotationpostprocessed map using a B-factor of -40
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: unfiltered refined half map

Fileemd_77227_half_map_1.map
Annotationunfiltered refined half map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: unfiltered refined half map

Fileemd_77227_half_map_2.map
Annotationunfiltered refined half 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 : tetrameric SthK protein

EntireName: tetrameric SthK protein
Components
  • Complex: tetrameric SthK protein
    • Protein or peptide: Putative transcriptional regulator, Crp/Fnr family
  • Ligand: ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE

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Supramolecule #1: tetrameric SthK protein

SupramoleculeName: tetrameric SthK protein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: tetrameric SthK protein in the presence of 5 mM cAMP reconstituted into 3:1 DOPC:POPE nanodiscs
Source (natural)Organism: Spirochaeta thermophila (bacteria) / Strain: DSM 6578
Molecular weightTheoretical: 200 KDa

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Macromolecule #1: Putative transcriptional regulator, Crp/Fnr family

MacromoleculeName: Putative transcriptional regulator, Crp/Fnr family / type: protein_or_peptide / ID: 1
Details: fusion of SthK with an N-terminal expression-enhancing peptide and a C-terminal tetra-His tag
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Winmispira thermophila DSM 6578 (bacteria)
Molecular weightTheoretical: 51.118574 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: MAKDIGINSD PNSSSVDKLM KSSGVSNPTY TLVWKVWILA VTLYYAIRIP LTLVFPSLFS PLLPLDILAS LALIADIPLD LAFESRRTS GRKPTLLAPS RLPDLLAALP LDLLVFALHL PSPLSLLSLV RLLKLISVQR SATRILSYRI NPALLRLLSL V GFILLAAH ...String:
MAKDIGINSD PNSSSVDKLM KSSGVSNPTY TLVWKVWILA VTLYYAIRIP LTLVFPSLFS PLLPLDILAS LALIADIPLD LAFESRRTS GRKPTLLAPS RLPDLLAALP LDLLVFALHL PSPLSLLSLV RLLKLISVQR SATRILSYRI NPALLRLLSL V GFILLAAH GIACGWMSLQ PPSENPAGTR YLSAFYWTIT TLTTIGYGDI TPSTPTQTVY TIVIELLGAA MYGLVIGNIA SL VSKLDAA KLLHRERVER VTAFLSYKRI SPELQRRIIE YFDYLWETRR GYEEREVLKE LPHPLRLAVA MEIHGDVIEK VPL FKGAGE EFIRDIILHL EPVIYGPGEY IIRAGEMGSD VYFINRGSVE VLSADEKTRY AILSEGQFFG EMALILRAPR TATV RARAF CDLYRLDKET FDRILSRYPE IAAQIQELAV RRKELESSGL VPRGSVKHHH H

UniProtKB: Transcriptional regulator, Crp/Fnr family

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Macromolecule #2: ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE

MacromoleculeName: ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE / type: ligand / ID: 2 / Number of copies: 1 / Formula: CMP
Molecular weightTheoretical: 329.206 Da
Chemical component information

ChemComp-CMP:
ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE

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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: 7.4
Component:
ConcentrationNameFormula
10.0 mMHEPES
100.0 mMPotassium chlorideKCl
5.0 mMcAMP
3.0 mMfluorinated Fos-choline 8
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298.15 K / Instrument: FEI VITROBOT MARK IV
Detailsmonodisperse nanodiscs of tetrameric SthK protein

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Slit width: 30 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 4602 / Average exposure time: 2.0 sec. / Average electron dose: 53.55 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.3 µm / Nominal magnification: 81000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 791318
CTF correctionSoftware - Name: CTFFIND / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Details: initial model generated in Relion from 2D-sorted particles
Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.66 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5.0) / Number images used: 132207
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5.0)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6cjq


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-35vl:
cAMP-bound SthK monomer from symmetry expanded particles - POPE class 2

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