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- PDB-7yox: Cryo-EM structure of the N-terminal domain of hMCM8/9 and HROB -

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Basic information

Entry
Database: PDB / ID: 7yox
TitleCryo-EM structure of the N-terminal domain of hMCM8/9 and HROB
Components
  • DNA helicase MCM8
  • DNA helicase MCM9
KeywordsHYDROLASE / MCM8/9
Function / homology
Function and homology information


MutLbeta complex binding / MutSbeta complex binding / recombinational interstrand cross-link repair / MCM8-MCM9 complex / male gamete generation / mismatch repair involved in maintenance of fidelity involved in DNA-dependent DNA replication / CDC6 association with the ORC:origin complex / MutSalpha complex binding / E2F-enabled inhibition of pre-replication complex formation / female gamete generation ...MutLbeta complex binding / MutSbeta complex binding / recombinational interstrand cross-link repair / MCM8-MCM9 complex / male gamete generation / mismatch repair involved in maintenance of fidelity involved in DNA-dependent DNA replication / CDC6 association with the ORC:origin complex / MutSalpha complex binding / E2F-enabled inhibition of pre-replication complex formation / female gamete generation / Unwinding of DNA / MCM complex / DNA duplex unwinding / single-stranded DNA helicase activity / Activation of the pre-replicative complex / Activation of ATR in response to replication stress / DNA helicase activity / protein localization to chromatin / double-strand break repair via homologous recombination / Orc1 removal from chromatin / chromosome / single-stranded DNA binding / DNA helicase / protein stabilization / cell cycle / DNA damage response / chromatin binding / protein-containing complex binding / enzyme binding / ATP hydrolysis activity / nucleoplasm / ATP binding / nucleus
Similarity search - Function
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 / ATPases associated with a variety of cellular activities ...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 / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Nucleic acid-binding, OB-fold / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA helicase MCM9 / DNA helicase MCM8
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.95 Å
AuthorsZheng, J.F. / Weng, Z.F. / Liu, Y.F.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31530015 China
CitationJournal: Elife / Year: 2023
Title: Structural and mechanistic insights into the MCM8/9 helicase complex.
Authors: Zhuangfeng Weng / Jiefu Zheng / Yiyi Zhou / Zuer Lu / Yixi Wu / Dongyi Xu / Huanhuan Li / Huanhuan Liang / Yingfang Liu /
Abstract: MCM8 and MCM9 form a functional helicase complex (MCM8/9) that plays an essential role in DNA homologous recombination repair for DNA double-strand break. However, the structural characterization of ...MCM8 and MCM9 form a functional helicase complex (MCM8/9) that plays an essential role in DNA homologous recombination repair for DNA double-strand break. However, the structural characterization of MCM8/9 for DNA binding/unwinding remains unclear. Here, we report structures of the MCM8/9 complex using cryo-electron microscopy single particle analysis. The structures reveal that MCM8/9 is arranged into a heterohexamer through a threefold symmetry axis, creating a central channel that accommodates DNA. Multiple characteristic hairpins from the N-terminal oligosaccharide/oligonucleotide (OB) domains of MCM8/9 protrude into the central channel and serve to unwind the duplex DNA. When activated by HROB, the structure of MCM8/9's N-tier ring converts its symmetry from to with a conformational change that expands the MCM8/9's trimer interface. Moreover, our structural dynamic analyses revealed that the flexible C-tier ring exhibited rotary motions relative to the N-tier ring, which is required for the unwinding ability of MCM8/9. In summary, our structural and biochemistry study provides a basis for understanding the DNA unwinding mechanism of MCM8/9 helicase in homologous recombination.
History
DepositionAug 2, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 9, 2023Provider: repository / Type: Initial release
Revision 1.1Dec 6, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DNA helicase MCM8
B: DNA helicase MCM9
C: DNA helicase MCM8
D: DNA helicase MCM9
E: DNA helicase MCM9
F: DNA helicase MCM8


Theoretical massNumber of molelcules
Total (without water)201,1646
Polymers201,1646
Non-polymers00
Water00
1


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

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Components

#1: Protein DNA helicase MCM8 / Minichromosome maintenance 8


Mass: 35482.418 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MCM8, C20orf154 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q9UJA3, DNA helicase
#2: Protein DNA helicase MCM9 / hMCM9 / Mini-chromosome maintenance deficient domain-containing protein 1 / Minichromosome maintenance 9


Mass: 31572.082 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MCM9, C6orf61, MCMDC1 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q9NXL9, DNA helicase

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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: Minichromosome maintenance 8 and 9 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER
VitrificationCryogen 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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 95257 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL

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