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- PDB-8s92: Structure of N-terminal domains of Walker B mutated MCM8/9 hetero... -

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Basic information

Entry
Database: PDB / ID: 8s92
TitleStructure of N-terminal domains of Walker B mutated MCM8/9 heterohexamer complex with ADP
Components
  • DNA helicase MCM8
  • DNA helicase MCM9
KeywordsDNA BINDING PROTEIN / DNA Replication / DNA repair
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 / MutSalpha complex binding / CDC6 association with the ORC:origin complex / female gamete generation / E2F-enabled inhibition of pre-replication complex formation ...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 / MutSalpha complex binding / CDC6 association with the ORC:origin complex / female gamete generation / E2F-enabled inhibition of pre-replication complex formation / Unwinding of DNA / MCM complex / DNA duplex unwinding / Activation of the pre-replicative complex / Activation of ATR in response to replication stress / protein localization to chromatin / DNA helicase activity / helicase activity / double-strand break repair via homologous recombination / Orc1 removal from chromatin / single-stranded DNA binding / chromosome / DNA helicase / protein stabilization / 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: 4.06 Å
AuthorsLi, C. / Gao, Y.
Funding support United States, 1items
OrganizationGrant numberCountry
Cancer Prevention and Research Institute of Texas (CPRIT)RR190046 United States
CitationJournal: Nucleic Acids Res / Year: 2023
Title: Activity, substrate preference and structure of the HsMCM8/9 helicase.
Authors: David R McKinzey / Chuxuan Li / Yang Gao / Michael A Trakselis /
Abstract: The minichromosomal maintenance proteins, MCM8 and MCM9, are more recent evolutionary additions to the MCM family, only cooccurring in selected higher eukaryotes. Mutations in these genes are ...The minichromosomal maintenance proteins, MCM8 and MCM9, are more recent evolutionary additions to the MCM family, only cooccurring in selected higher eukaryotes. Mutations in these genes are directly linked to ovarian insufficiency, infertility, and several cancers. MCM8/9 appears to have ancillary roles in fork progression and recombination of broken replication forks. However, the biochemical activity, specificities and structures have not been adequately illustrated, making mechanistic determination difficult. Here, we show that human MCM8/9 (HsMCM8/9) is an ATP dependent DNA helicase that unwinds fork DNA substrates with a 3'-5' polarity. High affinity ssDNA binding occurs in the presence of nucleoside triphosphates, while ATP hydrolysis weakens the interaction with DNA. The cryo-EM structure of the HsMCM8/9 heterohexamer was solved at 4.3 Å revealing a trimer of heterodimer configuration with two types of interfacial AAA+ nucleotide binding sites that become more organized upon binding ADP. Local refinements of the N or C-terminal domains (NTD or CTD) improved the resolution to 3.9 or 4.1 Å, respectively, and shows a large displacement in the CTD. Changes in AAA+ CTD upon nucleotide binding and a large swing between the NTD and CTD likely implies that MCM8/9 utilizes a sequential subunit translocation mechanism for DNA unwinding.
History
DepositionMar 27, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 7, 2023Provider: repository / Type: Initial release
Revision 1.1Jul 5, 2023Group: 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
Revision 1.2Aug 23, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)663,9106
Polymers663,9106
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: 93817.703 Da / Num. of mol.: 3 / Mutation: E519Q
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: 127485.594 Da / Num. of mol.: 3 / Mutation: E415Q
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: Structure of Walker B mutated MCM8/9 heterohexamer complex with ADP, N-terminal domains locally refined
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.500 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 8
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK I / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K

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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: 3000 nm / Nominal defocus min: 700 nm
Image recordingElectron dose: 49 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: NONE
3D reconstructionResolution: 4.06 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 227818 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00312954
ELECTRON MICROSCOPYf_angle_d0.6517523
ELECTRON MICROSCOPYf_dihedral_angle_d4.2231719
ELECTRON MICROSCOPYf_chiral_restr0.0452013
ELECTRON MICROSCOPYf_plane_restr0.0062235

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