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- EMDB-6942: Saccharomyces Cerevisiae Origin Recognition Complex Bound to a 36... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-6942 | |||||||||
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Title | Saccharomyces Cerevisiae Origin Recognition Complex Bound to a 36-bp Origin DNA containing ACS and B1 element | |||||||||
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Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||
![]() | Li N / Lam WH / Zhai Y / Cheng J / Cheng E / Zhao Y / Gao N / Tye BK | |||||||||
![]() | ![]() Title: Structure of the origin recognition complex bound to DNA replication origin. Authors: Ningning Li / Wai Hei Lam / Yuanliang Zhai / Jiaxuan Cheng / Erchao Cheng / Yongqian Zhao / Ning Gao / Bik-Kwoon Tye / ![]() ![]() Abstract: The six-subunit origin recognition complex (ORC) binds to DNA to mark the site for the initiation of replication in eukaryotes. Here we report a 3 Å cryo-electron microscopy structure of the ...The six-subunit origin recognition complex (ORC) binds to DNA to mark the site for the initiation of replication in eukaryotes. Here we report a 3 Å cryo-electron microscopy structure of the Saccharomyces cerevisiae ORC bound to a 72-base-pair origin DNA sequence that contains the ARS consensus sequence (ACS) and the B1 element. The ORC encircles DNA through extensive interactions with both phosphate backbone and bases, and bends DNA at the ACS and B1 sites. Specific recognition of thymine residues in the ACS is carried out by a conserved basic amino acid motif of Orc1 in the minor groove, and by a species-specific helical insertion motif of Orc4 in the major groove. Moreover, similar insertions into major and minor grooves are also embedded in the B1 site by basic patch motifs from Orc2 and Orc5, respectively, to contact bases and to bend DNA. This work pinpoints a conserved role of ORC in modulating DNA structure to facilitate origin selection and helicase loading in eukaryotes. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 5.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.3 KB 10.3 KB | Display Display | ![]() |
Images | ![]() | 195.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 79.4 KB | Display | ![]() |
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Full document | ![]() | 78.5 KB | Display | |
Data in XML | ![]() | 494 B | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.052 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Origin Recognition Complex Bound to a 36-bp Essential Elements of...
Entire | Name: Origin Recognition Complex Bound to a 36-bp Essential Elements of ARS DNA |
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Components |
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-Supramolecule #1: Origin Recognition Complex Bound to a 36-bp Essential Elements of...
Supramolecule | Name: Origin Recognition Complex Bound to a 36-bp Essential Elements of ARS DNA type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#8 Details: Origin Recognition Complex (Orc1-6, chain A-F) Bound to a 36-bp Essential Elements of ARS DNA (a 36-bp dsDNA chain G-H) |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.6 |
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 52.3 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 102000 |
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Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |