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- EMDB-31699: Cryo-EM structure of mutant MCM double hexamer (Mcm4 delta N140) -

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Basic information

Entry
Database: EMDB / ID: EMD-31699
TitleCryo-EM structure of mutant MCM double hexamer (Mcm4 delta N140)
Map data
Sample
  • Complex: DH-DDK (State I)
Biological speciesSaccharomyces cerevisiae S288c (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsCheng J / Li N / Huo Y / Dang S / Tye B / Gao N / Zhai Y
Funding support China, 1 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China) China
CitationJournal: Nat Commun / Year: 2022
Title: Structural Insight into the MCM double hexamer activation by Dbf4-Cdc7 kinase.
Authors: Jiaxuan Cheng / Ningning Li / Yunjing Huo / Shangyu Dang / Bik-Kwoon Tye / Ning Gao / Yuanliang Zhai /
Abstract: The Dbf4-dependent kinase Cdc7 (DDK) regulates DNA replication initiation by phosphorylation of the MCM double hexamer (MCM-DH) to promote helicase activation. Here, we determine a series of cryo ...The Dbf4-dependent kinase Cdc7 (DDK) regulates DNA replication initiation by phosphorylation of the MCM double hexamer (MCM-DH) to promote helicase activation. Here, we determine a series of cryo electron microscopy (cryo-EM) structures of yeast DDK bound to the MCM-DH. These structures, occupied by one or two DDKs, differ primarily in the conformations of the kinase core. The interactions of DDK with the MCM-DH are mediated exclusively by subunit Dbf4 straddling across the hexamer interface on the three N-terminal domains (NTDs) of subunits Mcm2, Mcm6, and Mcm4. This arrangement brings Cdc7 close to its only essential substrate, the N-terminal serine/threonine-rich domain (NSD) of Mcm4. Dbf4 further displaces the NSD from its binding site on Mcm4-NTD, facilitating an immediate targeting of this motif by Cdc7. Moreover, the active center of Cdc7 is occupied by a unique Dbf4 inhibitory loop, which is disengaged when the kinase core assumes wobbling conformations. This study elucidates the versatility of Dbf4 in regulating the ordered multisite phosphorylation of the MCM-DH by Cdc7 kinase during helicase activation.
History
DepositionAug 11, 2021-
Header (metadata) releaseApr 13, 2022-
Map releaseApr 13, 2022-
UpdateApr 13, 2022-
Current statusApr 13, 2022Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_31699.png

Downloads & links

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Map

FileDownload / File: emd_31699.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 360 pix.
= 381.6 Å		1.06 Å/pix.
x 360 pix.
= 381.6 Å		1.06 Å/pix.
x 360 pix.
= 381.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.035
Minimum - Maximum-0.094854 - 0.17889471
Average (Standard dev.)0.00042244873 (±0.0055708024)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 381.59998 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : DH-DDK (State I)

EntireName: DH-DDK (State I)
Components
  • Complex: DH-DDK (State I)

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Supramolecule #1: DH-DDK (State I)

SupramoleculeName: DH-DDK (State I) / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#8
Source (natural)Organism: Saccharomyces cerevisiae S288c (yeast)
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)

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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: 7.6
Sugar embeddingMaterial: Ice
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: 46.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 58621
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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