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- PDB-7z13: S. cerevisiae CMGE dimer nucleating origin DNA melting -

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Basic information

Entry
Database: PDB / ID: 7z13
TitleS. cerevisiae CMGE dimer nucleating origin DNA melting
Components
  • (DNA (53-MER)) x 2
  • (DNA polymerase epsilon ...) x 2
  • (DNA replication complex GINS protein ...) x 4
  • (DNA replication licensing factor ...) x 5
  • Cell division control protein 45
  • DNA helicase
KeywordsREPLICATION / DNA replication / helicase / initiation / DNA origin
Function / homology
Function and homology information


cell cycle / DNA-templated DNA replication maintenance of fidelity / gene conversion / Unwinding of DNA / DNA replication initiation / MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / epsilon DNA polymerase complex / DNA strand elongation involved in mitotic DNA replication ...cell cycle / DNA-templated DNA replication maintenance of fidelity / gene conversion / Unwinding of DNA / DNA replication initiation / MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / epsilon DNA polymerase complex / DNA strand elongation involved in mitotic DNA replication / MCM complex binding / GINS complex / nuclear DNA replication / mitotic DNA replication preinitiation complex assembly / premeiotic DNA replication / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / SUMO binding / nucleotide-excision repair, DNA gap filling / mitotic DNA replication / Activation of the pre-replicative complex / DNA replication proofreading / CMG complex / nuclear pre-replicative complex / single-stranded DNA 3'-5' DNA exonuclease activity / Activation of ATR in response to replication stress / DNA replication preinitiation complex / MCM complex / Termination of translesion DNA synthesis / mitotic DNA replication checkpoint signaling / replication fork protection complex / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / mitotic intra-S DNA damage checkpoint signaling / silent mating-type cassette heterochromatin formation / Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters / DNA strand elongation involved in DNA replication / mitotic sister chromatid cohesion / 3'-5' DNA helicase activity / leading strand elongation / DNA unwinding involved in DNA replication / nuclear replication fork / DNA replication origin binding / Dual incision in TC-NER / DNA replication initiation / subtelomeric heterochromatin formation / error-prone translesion synthesis / base-excision repair, gap-filling / DNA helicase activity / replication fork / helicase activity / base-excision repair / DNA-templated DNA replication / double-strand break repair via nonhomologous end joining / double-strand break repair / single-stranded DNA binding / mitotic cell cycle / 4 iron, 4 sulfur cluster binding / double-stranded DNA binding / DNA helicase / DNA-directed DNA polymerase / chromosome, telomeric region / DNA-directed DNA polymerase activity / hydrolase activity / mRNA binding / nucleotide binding / chromatin binding / ATP hydrolysis activity / DNA binding / zinc ion binding / nucleoplasm / ATP binding / nucleus / metal ion binding / cytoplasm
Similarity search - Function
DNA polymerase epsilon, subunit B / DNA polymerase epsilon catalytic subunit A, thumb domain / Zinc finger domain of DNA polymerase-epsilon / DNA polymerase epsilon, catalytic subunit A, C-terminal / DNA polymerase epsilon catalytic subunit / Domain of unknown function (DUF1744) / DUF1744 / : / MCM3 winged helix domain / GINS/PriA/YqbF domain ...DNA polymerase epsilon, subunit B / DNA polymerase epsilon catalytic subunit A, thumb domain / Zinc finger domain of DNA polymerase-epsilon / DNA polymerase epsilon, catalytic subunit A, C-terminal / DNA polymerase epsilon catalytic subunit / Domain of unknown function (DUF1744) / DUF1744 / : / MCM3 winged helix domain / GINS/PriA/YqbF domain / CDC45 family / DNA replication complex GINS protein Psf2 / CDC45-like protein / GINS complex, subunit Psf1 / GINS complex, subunit Psf3 / GINS complex, subunit Psf3 superfamily / DNA replication complex GINS protein SLD5, C-terminal / GINS, helical bundle-like domain superfamily / GINS complex protein Sld5, alpha-helical domain / DNA replication complex GINS protein SLD5 C-terminus / GINS complex subunit Sld5 / GINS subunit, domain A / GINS complex protein helical bundle domain / MCM4, winged helix domain / DNA polymerase alpha/delta/epsilon, subunit B / DNA polymerase alpha/epsilon subunit B / DNA replication licensing factor Mcm5 / DNA replication licensing factor Mcm3 / Mini-chromosome maintenance complex protein 4 / 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 / DNA polymerase family B, thumb domain / DNA polymerase family B, exonuclease domain / DNA-directed DNA polymerase, family B, exonuclease domain / DNA polymerase, palm domain superfamily / DNA polymerase type-B family / DNA-directed DNA polymerase, family B / Ribonuclease H superfamily / Ribonuclease H-like superfamily / Winged helix-like DNA-binding domain superfamily / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Nucleic acid-binding, OB-fold / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / DNA / DNA (> 10) / DNA replication licensing factor MCM5 / DNA replication complex GINS protein PSF2 / DNA replication licensing factor MCM2 / DNA replication complex GINS protein PSF1 / DNA replication licensing factor MCM7 / DNA polymerase epsilon catalytic subunit A ...ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / DNA / DNA (> 10) / DNA replication licensing factor MCM5 / DNA replication complex GINS protein PSF2 / DNA replication licensing factor MCM2 / DNA replication complex GINS protein PSF1 / DNA replication licensing factor MCM7 / DNA polymerase epsilon catalytic subunit A / DNA replication licensing factor MCM3 / DNA polymerase epsilon subunit B / DNA replication licensing factor MCM4 / DNA replication licensing factor MCM6 / DNA replication complex GINS protein SLD5 / Cell division control protein 45 / DNA replication complex GINS protein PSF3
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
DNA molecule (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsLewis, J.S. / Sousa, J.S. / Costa, A.
Funding supportEuropean Union, France, United Kingdom, 10items
OrganizationGrant numberCountry
European Molecular Biology Organization (EMBO)211-2020European Union
H2020 Marie Curie Actions of the European CommissionEuropean Union
European Molecular Biology Organization (EMBO)1177-2020European Union
Human Frontier Science Program (HFSP)LT000834/2020-L France
European Molecular Biology Organization (EMBO)962-2019European Union
The Francis Crick InstituteFC001065 United Kingdom
The Francis Crick InstituteFC001066 United Kingdom
Wellcome Trust106252/Z/14/Z United Kingdom
European Research Council (ERC)669424-CHROMOREPEuropean Union
European Research Council (ERC)820102European Union
CitationJournal: Nature / Year: 2022
Title: Mechanism of replication origin melting nucleated by CMG helicase assembly.
Authors: Jacob S Lewis / Marta H Gross / Joana Sousa / Sarah S Henrikus / Julia F Greiwe / Andrea Nans / John F X Diffley / Alessandro Costa /
Abstract: The activation of eukaryotic origins of replication occurs in temporally separated steps to ensure that chromosomes are copied only once per cell cycle. First, the MCM helicase is loaded onto duplex ...The activation of eukaryotic origins of replication occurs in temporally separated steps to ensure that chromosomes are copied only once per cell cycle. First, the MCM helicase is loaded onto duplex DNA as an inactive double hexamer. Activation occurs after the recruitment of a set of firing factors that assemble two Cdc45-MCM-GINS (CMG) holo-helicases. CMG formation leads to the underwinding of DNA on the path to the establishment of the replication fork, but whether DNA becomes melted at this stage is unknown. Here we use cryo-electron microscopy to image ATP-dependent CMG assembly on a chromatinized origin, reconstituted in vitro with purified yeast proteins. We find that CMG formation disrupts the double hexamer interface and thereby exposes duplex DNA in between the two CMGs. The two helicases remain tethered, which gives rise to a splayed dimer, with implications for origin activation and replisome integrity. Inside each MCM ring, the double helix becomes untwisted and base pairing is broken. This comes as the result of ATP-triggered conformational changes in MCM that involve DNA stretching and protein-mediated stabilization of three orphan bases. Mcm2 pore-loop residues that engage DNA in our structure are dispensable for double hexamer loading and CMG formation, but are essential to untwist the DNA and promote replication. Our results explain how ATP binding nucleates origin DNA melting by the CMG and maintains replisome stability at initiation.
History
DepositionFeb 24, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 15, 2022Provider: repository / Type: Initial release
Revision 1.1Jun 29, 2022Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Jul 6, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.3Jul 17, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_admin / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
2: DNA replication licensing factor MCM2
3: DNA replication licensing factor MCM3
4: DNA replication licensing factor MCM4
5: DNA helicase
6: DNA replication licensing factor MCM6
7: DNA replication licensing factor MCM7
A: DNA (53-MER)
B: DNA (53-MER)
C: DNA replication complex GINS protein PSF3
D: DNA replication complex GINS protein SLD5
E: Cell division control protein 45
F: DNA polymerase epsilon subunit B
H: DNA replication complex GINS protein PSF1
I: DNA replication complex GINS protein PSF2
J: DNA replication complex GINS protein PSF3
K: DNA replication complex GINS protein SLD5
L: Cell division control protein 45
M: DNA polymerase epsilon subunit B
N: DNA polymerase epsilon catalytic subunit A
O: DNA replication complex GINS protein PSF1
P: DNA replication complex GINS protein PSF2
Q: DNA polymerase epsilon catalytic subunit A
a: DNA replication licensing factor MCM2
b: DNA replication licensing factor MCM3
c: DNA replication licensing factor MCM4
d: DNA helicase
e: DNA replication licensing factor MCM6
f: DNA replication licensing factor MCM7
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,297,53660
Polymers2,290,70828
Non-polymers6,82832
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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DNA replication licensing factor ... , 5 types, 10 molecules 2a3b4c6e7f

#1: Protein DNA replication licensing factor MCM2 / Minichromosome maintenance protein 2


Mass: 98911.539 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: PACBIOSEQ_LOCUS187, PACBIOSEQ_LOCUS193, PACBIOSEQ_LOCUS195, PACBIOSEQ_LOCUS196, SCNYR20_0007007400, SCP684_0007007100
Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: A0A6A5Q1S9, DNA helicase
#2: Protein DNA replication licensing factor MCM3 / Minichromosome maintenance protein 3


Mass: 111720.242 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: MCM3, YEL032W, SYGP-ORF23 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P24279, DNA helicase
#3: Protein DNA replication licensing factor MCM4 / Cell division control protein 54


Mass: 105138.375 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: MCM4, CDC54, HCD21, YPR019W, YP9531.13 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P30665, DNA helicase
#5: Protein DNA replication licensing factor MCM6 / Minichromosome maintenance protein 6


Mass: 113110.211 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: MCM6, YGL201C / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P53091, DNA helicase
#6: Protein DNA replication licensing factor MCM7


Mass: 95049.875 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: MCM7, PACBIOSEQ_LOCUS429 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: A0A6A5Q4N0, DNA helicase

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Protein , 2 types, 4 molecules 5dEL

#4: Protein DNA helicase


Mass: 86505.734 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: PACBIOSEQ_LOCUS4054, PACBIOSEQ_LOCUS4112, PACBIOSEQ_LOCUS4129, PACBIOSEQ_LOCUS4153, PACBIOSEQ_LOCUS4202, SCNYR20_0004029000, SCP684_0004028600
Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: A0A6A5PUY8, DNA helicase
#11: Protein Cell division control protein 45


Mass: 75154.703 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: CDC45, SLD4, YLR103C, L8004.11 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q08032

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DNA chain , 2 types, 2 molecules AB

#7: DNA chain DNA (53-MER)


Mass: 16320.634 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) DNA molecule (others)
#8: DNA chain DNA (53-MER)


Mass: 16311.620 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) DNA molecule (others)

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DNA replication complex GINS protein ... , 4 types, 8 molecules CJDKHOIP

#9: Protein DNA replication complex GINS protein PSF3 / Partner of Sld five 3


Mass: 25718.070 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: PSF3, YOL146W / Production host: Escherichia coli (E. coli) / References: UniProt: Q12146
#10: Protein DNA replication complex GINS protein SLD5


Mass: 33983.617 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: SLD5, YDR489W / Production host: Escherichia coli (E. coli) / References: UniProt: Q03406
#13: Protein DNA replication complex GINS protein PSF1


Mass: 24230.576 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: PACBIOSEQ_LOCUS944, PACBIOSEQ_LOCUS956, PACBIOSEQ_LOCUS958, SCNYR20_0001022500, SCP684_0001022000
Production host: Escherichia coli (E. coli) / References: UniProt: A0A6A5Q203
#14: Protein DNA replication complex GINS protein PSF2


Mass: 25096.807 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: PACBIOSEQ_LOCUS3163, PACBIOSEQ_LOCUS3191, PACBIOSEQ_LOCUS3224, PACBIOSEQ_LOCUS3231, PACBIOSEQ_LOCUS3255, SCNYR20_0009012300, SCP684_0009011800
Production host: Escherichia coli (E. coli) / References: UniProt: A0A6A5PX40

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DNA polymerase epsilon ... , 2 types, 4 molecules FMNQ

#12: Protein DNA polymerase epsilon subunit B / DNA polymerase II subunit 2


Mass: 78425.852 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: DPB2, YPR175W, P9705.7 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P24482
#15: Protein DNA polymerase epsilon catalytic subunit A / 3'-5' exodeoxyribonuclease / DNA polymerase II subunit A


Mass: 255992.484 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Strain: ATCC 204508 / S288c / Gene: POL2, DUN2, YNL262W, N0825 / Production host: Saccharomyces cerevisiae (brewer's yeast)
References: UniProt: P21951, DNA-directed DNA polymerase, Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters

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Non-polymers , 4 types, 32 molecules

#16: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#17: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#18: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#19: Chemical
ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: S. cerevisiae CMGE dimer nucleating origin DNA melting
Type: COMPLEX
Details: Dimeric model reconstituted from symmetry expanded monomer (PDB entry 7QHS).
Entity ID: #1-#15 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Source (recombinant)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: four microlitres of sample was applied on a grid and incubated for 2 min at room temperature before blotting with filter paper for 5.5 s and plunge-freezing in liquid ethane.
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 4400 nm / Nominal defocus min: 2000 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 1.6 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 65286
Image scansMovie frames/image: 32

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Processing

EM software
IDNameVersionCategory
2EPUimage acquisition
7UCSF ChimeraX1.3model fitting
9RELION3.1initial Euler assignment
10RELION3.1final Euler assignment
12RELION3.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 71348 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Details: One additional base pair has been built to connect the DNA molecules from the two individual symmetry expanded monomers.
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
17QHS

7qhs

17QHS1PDBexperimental model
21

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