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- EMDB-70431: CI ring of daytime state KaiC -

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Basic information

Entry
Database: EMDB / ID: EMD-70431
TitleCI ring of daytime state KaiC
Map dataspIsoNet corrected and sharpened map used for model building
Sample
  • Complex: Hexameric KaiC protein
    • Protein or peptide: Circadian clock protein kinase KaiC
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
KeywordsAAA ATPase / circadian oscillator / kinase / phosphatase / CIRCADIAN CLOCK PROTEIN
Function / homology
Function and homology information


regulation of phosphorelay signal transduction system / negative regulation of circadian rhythm / entrainment of circadian clock / protein serine/threonine/tyrosine kinase activity / circadian rhythm / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / non-specific serine/threonine protein kinase / protein serine kinase activity / protein serine/threonine kinase activity / regulation of DNA-templated transcription ...regulation of phosphorelay signal transduction system / negative regulation of circadian rhythm / entrainment of circadian clock / protein serine/threonine/tyrosine kinase activity / circadian rhythm / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / non-specific serine/threonine protein kinase / protein serine kinase activity / protein serine/threonine kinase activity / regulation of DNA-templated transcription / magnesium ion binding / ATP hydrolysis activity / DNA binding / ATP binding / identical protein binding
Similarity search - Function
Circadian clock KaiC, bacteria / : / Circadian clock protein kinase KaiC / : / : / KaiC domain / KaiC domain profile. / KaiC-like domain / KaiC / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Circadian clock oscillator protein KaiC
Similarity search - Component
Biological speciesSynechococcus elongatus (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsDzimianski JV / Sandate CR / Balasco Serrao VH / Lander GC / Partch CL
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Aging (NIH/NIA)R21GM142196 United States
CitationJournal: To Be Published
Title: CI ring of daytime state KaiC
Authors: Dzimianski JV / Sandate CR / Balasco Serrao VH / Lander GC / Partch CL
History
DepositionApr 29, 2025-
Header (metadata) releaseMay 14, 2025-
Map releaseMay 14, 2025-
UpdateMay 14, 2025-
Current statusMay 14, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70431.png

Downloads & links

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Map

FileDownload / File: emd_70431.map.gz / Format: CCP4 / Size: 40.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationspIsoNet corrected and sharpened map used for model building
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.15 Å/pix.
x 220 pix.
= 253. Å		1.15 Å/pix.
x 220 pix.
= 253. Å		1.15 Å/pix.
x 220 pix.
= 253. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.15 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-2.963129 - 3.938282
Average (Standard dev.)-0.0003305817 (±0.07780655)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions220220220
Spacing220220220
CellA=B=C: 253.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_70431_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: unsharpened map

Fileemd_70431_additional_1.map
Annotationunsharpened map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: spIsoNet corrected half map B

Fileemd_70431_additional_2.map
AnnotationspIsoNet corrected half map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: spIsoNet corrected half map A

Fileemd_70431_additional_3.map
AnnotationspIsoNet corrected half map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map B from refinement

Fileemd_70431_half_map_1.map
Annotationhalf map B from refinement
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map A from refinement

Fileemd_70431_half_map_2.map
Annotationhalf map A from refinement
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Hexameric KaiC protein

EntireName: Hexameric KaiC protein
Components
  • Complex: Hexameric KaiC protein
    • Protein or peptide: Circadian clock protein kinase KaiC
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Hexameric KaiC protein

SupramoleculeName: Hexameric KaiC protein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Synechococcus elongatus (bacteria)

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Macromolecule #1: Circadian clock protein kinase KaiC

MacromoleculeName: Circadian clock protein kinase KaiC / type: protein_or_peptide / ID: 1 / Number of copies: 6 / Enantiomer: LEVO / EC number: non-specific serine/threonine protein kinase
Source (natural)Organism: Synechococcus elongatus (bacteria)
Molecular weightTheoretical: 58.084781 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MTSAEMTSPN NNSEHQAIAK MRTMIEGFDD ISHGGLPIGR STLVSGTSGT GKTLFSIQFL YNGIIEFDEP GVFVTFEETP QDIIKNARS FGWDLAKLVD EGKLFILDAS PDPEGQEVVG GFDLSALIER INYAIQKYRA RRVSIDSVTS VFQQYDASSV V RRELFRLV ...String:
MTSAEMTSPN NNSEHQAIAK MRTMIEGFDD ISHGGLPIGR STLVSGTSGT GKTLFSIQFL YNGIIEFDEP GVFVTFEETP QDIIKNARS FGWDLAKLVD EGKLFILDAS PDPEGQEVVG GFDLSALIER INYAIQKYRA RRVSIDSVTS VFQQYDASSV V RRELFRLV ARLKQIGATT VMTTERIEEY GPIARYGVEE FVSDNVVILR NVLEGERRRR TLEILKLRGT SHMKGEYPFT IT DHGINIF PLGAMRLTQR SSNVRVSSGV VRLDEMCGGG FFKDSIILAT GATGTGKTLL VSRFVENACA NKERAILFAY EES RAQLLR NAYSWGMDFE EMERQNLLKI VCAYPESAGL EDHLQIIKSE INDFKPARIA IDSLSALARG VSNNAFRQFV IGVT GYAKQ EEITGLFTNT SDQFMGAHSI TDSHIAEITD TIILLQYVEI RGEMSRAINV FKMRGSWHDK AIREFMISDK GPDIK DSFR NFERIISGSP TRITVDEKSE LSRIVRGVQE KGPES

UniProtKB: Circadian clock oscillator protein KaiC

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Macromolecule #2: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 2 / Number of copies: 6 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

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Macromolecule #3: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 6 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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

Concentration6 mg/mL
BufferpH: 7.4
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE / Support film - topology: CONTINUOUS
VitrificationCryogen name: ETHANE / Instrument: HOMEMADE PLUNGER

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Number real images: 1982 / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 36000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 2641605
CTF correctionSoftware - Name: cryoSPARC (ver. 4.5.3) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C6 (6 fold cyclic) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.5.3) / Number images used: 279379
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. 4.5.3)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. 4.5.3)
Final 3D classificationNumber classes: 4 / Software - Name: cryoSPARC (ver. 4.5.3)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

7s66


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL
Output model

PDB-9ofg:
CI ring of daytime state KaiC

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