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Open data
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Basic information
Entry | Database: PDB / ID: 6wgf | ||||||||||||||||||
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Title | Atomic model of mutant Mcm2-7 hexamer with Mcm6 WHD truncation | ||||||||||||||||||
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![]() | REPLICATION / DNA replication / Cryo-EM / OCCM-deltaC6 | ||||||||||||||||||
Function / homology | ![]() 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 / single-stranded 3'-5' DNA helicase activity / nuclear pre-replicative complex / MCM complex / Activation of ATR in response to replication stress / DNA replication preinitiation complex / replication fork protection complex / mitotic DNA replication initiation / double-strand break repair via break-induced replication / silent mating-type cassette heterochromatin formation / regulation of DNA-templated DNA replication initiation / single-stranded DNA helicase activity / DNA strand elongation involved in DNA replication / DNA unwinding involved in DNA replication / nuclear replication fork / 3'-5' DNA helicase activity / DNA replication origin binding / subtelomeric heterochromatin formation / DNA replication initiation / heterochromatin formation / helicase activity / single-stranded DNA binding / DNA helicase / chromosome, telomeric region / DNA damage response / chromatin binding / ATP hydrolysis activity / nucleoplasm / ATP binding / nucleus / metal ion binding / cytoplasm Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 7.7 Å | ||||||||||||||||||
![]() | Yuan, Z. / Schneider, S. / Dodd, T. / Riera, A. / Bai, L. / Yan, C. / Magdalou, I. / Ivanov, I. / Stillman, B. / Li, H. / Speck, C. | ||||||||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Structural mechanism of helicase loading onto replication origin DNA by ORC-Cdc6. Authors: Zuanning Yuan / Sarah Schneider / Thomas Dodd / Alberto Riera / Lin Bai / Chunli Yan / Indiana Magdalou / Ivaylo Ivanov / Bruce Stillman / Huilin Li / Christian Speck / ![]() ![]() Abstract: DNA replication origins serve as sites of replicative helicase loading. In all eukaryotes, the six-subunit origin recognition complex (Orc1-6; ORC) recognizes the replication origin. During late M- ...DNA replication origins serve as sites of replicative helicase loading. In all eukaryotes, the six-subunit origin recognition complex (Orc1-6; ORC) recognizes the replication origin. During late M-phase of the cell-cycle, Cdc6 binds to ORC and the ORC-Cdc6 complex loads in a multistep reaction and, with the help of Cdt1, the core Mcm2-7 helicase onto DNA. A key intermediate is the ORC-Cdc6-Cdt1-Mcm2-7 (OCCM) complex in which DNA has been already inserted into the central channel of Mcm2-7. Until now, it has been unclear how the origin DNA is guided by ORC-Cdc6 and inserted into the Mcm2-7 hexamer. Here, we truncated the C-terminal winged-helix-domain (WHD) of Mcm6 to slow down the loading reaction, thereby capturing two loading intermediates prior to DNA insertion in budding yeast. In "semi-attached OCCM," the Mcm3 and Mcm7 WHDs latch onto ORC-Cdc6 while the main body of the Mcm2-7 hexamer is not connected. In "pre-insertion OCCM," the main body of Mcm2-7 docks onto ORC-Cdc6, and the origin DNA is bent and positioned adjacent to the open DNA entry gate, poised for insertion, at the Mcm2-Mcm5 interface. We used molecular simulations to reveal the dynamic transition from preloading conformers to the loaded conformers in which the loading of Mcm2-7 on DNA is complete and the DNA entry gate is fully closed. Our work provides multiple molecular insights into a key event of eukaryotic DNA replication. | ||||||||||||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 628.5 KB | Display | ![]() |
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PDB format | ![]() | 480.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 965.6 KB | Display | ![]() |
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Full document | ![]() | 992.6 KB | Display | |
Data in XML | ![]() | 85.6 KB | Display | |
Data in CIF | ![]() | 133.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 21664MC ![]() 6wgcC ![]() 6wggC ![]() 6wgiC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-DNA replication licensing factor ... , 5 types, 5 molecules 27643
#1: Protein | Mass: 98911.539 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM2, YBL023C, YBL0438 / Production host: ![]() ![]() |
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#2: Protein | Mass: 95049.875 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM7, CDC47, YBR202W, YBR1441 / Production host: ![]() ![]() |
#3: Protein | Mass: 113110.211 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM6, YGL201C / Production host: ![]() ![]() |
#5: Protein | Mass: 105138.375 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM4, CDC54, HCD21, YPR019W, YP9531.13 / Production host: ![]() ![]() |
#6: Protein | Mass: 107653.508 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM3, YEL032W, SYGP-ORF23 / Production host: ![]() ![]() |
-Protein , 1 types, 1 molecules 5
#4: Protein | Mass: 86505.734 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: MCM5, CDC46, YLR274W, L9328.1 / Production host: ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Mcm2-7 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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Symmetry | Point symmetry: C1 (asymmetric) |
3D reconstruction | Resolution: 7.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 24072 / Symmetry type: POINT |
Atomic model building | Protocol: RIGID BODY FIT |