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- EMDB-6672: Cryo-EM structure of the Cdt1-MCM2-7 complex. -

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Basic information

Entry
Database: EMDB / ID: EMD-6672
TitleCryo-EM structure of the Cdt1-MCM2-7 complex.
Map data
Sample
  • Complex: Cdt1-MCM2-7 in ADP state
Function / homology
Function and homology information


MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative complex / CMG complex ...MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative complex / CMG complex / nuclear pre-replicative complex / Activation of ATR in response to replication stress / DNA replication preinitiation complex / MCM complex / replication fork protection complex / double-strand break repair via break-induced replication / single-stranded DNA helicase activity / mitotic DNA replication initiation / regulation of DNA-templated DNA replication initiation / silent mating-type cassette heterochromatin formation / DNA strand elongation involved in DNA replication / nuclear replication fork / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / helicase activity / transcription elongation by RNA polymerase II / heterochromatin formation / single-stranded DNA binding / DNA helicase / forked DNA-dependent helicase activity / single-stranded 3'-5' DNA helicase activity / four-way junction helicase activity / double-stranded DNA helicase activity / chromosome, telomeric region / DNA replication / cell division / DNA damage response / chromatin binding / ATP hydrolysis activity / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytoplasm
Similarity search - Function
DNA replication factor Cdt1, C-terminal / DNA replication factor Cdt1, C-terminal WH domain superfamily / DNA replication factor Cdt1 C-terminal domain / : / MCM3 winged helix domain / MCM4, winged helix domain / : / MCM5, C-terminal domain / DNA replication licensing factor Mcm5 / DNA replication licensing factor Mcm3 ...DNA replication factor Cdt1, C-terminal / DNA replication factor Cdt1, C-terminal WH domain superfamily / DNA replication factor Cdt1 C-terminal domain / : / MCM3 winged helix domain / MCM4, winged helix domain / : / MCM5, C-terminal domain / DNA replication licensing factor Mcm5 / DNA replication licensing factor Mcm3 / Mini-chromosome maintenance complex protein 4 / MCM3-like, winged helix domain / DNA replication licensing factor Mcm6 / DNA replication licensing factor Mcm7 / Mcm6, C-terminal winged-helix domain / MCM6 C-terminal winged-helix domain / DNA replication licensing factor Mcm2 / Mini-chromosome maintenance protein 2 / Mini-chromosome maintenance, conserved site / MCM family signature. / MCM N-terminal domain / MCM N-terminal domain / MCM OB domain / MCM OB domain / Mini-chromosome maintenance protein / MCM, AAA-lid domain / MCM P-loop domain / MCM AAA-lid domain / MCM family domain profile. / minichromosome maintenance proteins / MCM domain / Winged helix-like DNA-binding domain superfamily / Nucleic acid-binding, OB-fold / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA replication licensing factor MCM3 / DNA replication licensing factor MCM2 / Minichromosome maintenance protein 5 / DNA replication licensing factor MCM4 / DNA replication licensing factor MCM7 / Cell division cycle protein CDT1 / DNA replication licensing factor MCM6
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.1 Å
AuthorsZhai Y / Cheng E / Wu H / Li N / Yung PYK / Gao N / Tye BK
CitationJournal: Nat Struct Mol Biol / Year: 2017
Title: Open-ringed structure of the Cdt1-Mcm2-7 complex as a precursor of the MCM double hexamer.
Authors: Yuanliang Zhai / Erchao Cheng / Hao Wu / Ningning Li / Philip Yuk Kwong Yung / Ning Gao / Bik-Kwoon Tye /
Abstract: The minichromosome maintenance complex (MCM) hexameric complex (Mcm2-7) forms the core of the eukaryotic replicative helicase. During G1 phase, two Cdt1-Mcm2-7 heptamers are loaded onto each ...The minichromosome maintenance complex (MCM) hexameric complex (Mcm2-7) forms the core of the eukaryotic replicative helicase. During G1 phase, two Cdt1-Mcm2-7 heptamers are loaded onto each replication origin by the origin-recognition complex (ORC) and Cdc6 to form an inactive MCM double hexamer (DH), but the detailed loading mechanism remains unclear. Here we examine the structures of the yeast MCM hexamer and Cdt1-MCM heptamer from Saccharomyces cerevisiae. Both complexes form left-handed coil structures with a 10-15-Å gap between Mcm5 and Mcm2, and a central channel that is occluded by the C-terminal domain winged-helix motif of Mcm5. Cdt1 wraps around the N-terminal regions of Mcm2, Mcm6 and Mcm4 to stabilize the whole complex. The intrinsic coiled structures of the precursors provide insights into the DH formation, and suggest a spring-action model for the MCM during the initial origin melting and the subsequent DNA unwinding.
History
DepositionNov 18, 2016-
Header (metadata) releaseFeb 1, 2017-
Map releaseFeb 8, 2017-
UpdateFeb 15, 2017-
Current statusFeb 15, 2017Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0195
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.0195
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_6672.png

Downloads & links

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Map

FileDownload / File: emd_6672.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.32 Å/pix.
x 200 pix.
= 264. Å		1.32 Å/pix.
x 200 pix.
= 264. Å		1.32 Å/pix.
x 200 pix.
= 264. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.32 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0231 / Movie #1: 0.0195
Minimum - Maximum-0.022343313 - 0.07547166
Average (Standard dev.)-0.00009937599 (±0.004384619)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 264.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.321.321.32
M x/y/z200200200
origin x/y/z0.0000.0000.000
length x/y/z264.000264.000264.000
α/β/γ90.00090.00090.000
start NX/NY/NZ-190-190-190
NX/NY/NZ380380380
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS200200200
D min/max/mean-0.0220.075-0.000

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Supplemental data

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Sample components

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Entire : Cdt1-MCM2-7 in ADP state

EntireName: Cdt1-MCM2-7 in ADP state
Components
  • Complex: Cdt1-MCM2-7 in ADP state

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Supramolecule #1: Cdt1-MCM2-7 in ADP state

SupramoleculeName: Cdt1-MCM2-7 in ADP state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast) / Recombinant plasmid: yJF38, yJF39

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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: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 1.25 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 7.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 47200
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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