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Open data
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Basic information
Entry | Database: PDB / ID: 7jk6 | ||||||
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Title | Structure of Drosophila ORC in the active conformation | ||||||
![]() | (Origin recognition complex subunit ...) x 6 | ||||||
![]() | REPLICATION / origin recognition complex / DNA replication initiation | ||||||
Function / homology | ![]() alpha-heterochromatin / larval feeding behavior / CDC6 association with the ORC:origin complex / septin cytoskeleton / septin cytoskeleton organization / Activation of ATR in response to replication stress / Activation of the pre-replicative complex / eggshell chorion gene amplification / Orc1 removal from chromatin / origin recognition complex ...alpha-heterochromatin / larval feeding behavior / CDC6 association with the ORC:origin complex / septin cytoskeleton / septin cytoskeleton organization / Activation of ATR in response to replication stress / Activation of the pre-replicative complex / eggshell chorion gene amplification / Orc1 removal from chromatin / origin recognition complex / DNA amplification / positive regulation of border follicle cell migration / Assembly of the ORC complex at the origin of replication / nuclear origin of replication recognition complex / olfactory learning / nuclear pre-replicative complex / DNA replication preinitiation complex / mitotic DNA replication checkpoint signaling / mitotic chromosome condensation / chromosome condensation / DNA replication origin binding / DNA replication initiation / heterochromatin / ribonucleoprotein complex binding / nuclear pore / GTPase activator activity / mitotic spindle organization / learning / DNA-templated DNA replication / mitotic cell cycle / DNA replication / learning or memory / chromatin binding / protein homodimerization activity / ATP hydrolysis activity / DNA binding / ATP binding / nucleus / metal ion binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å | ||||||
![]() | Schmidt, J.M. / Bleichert, F. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural mechanism for replication origin binding and remodeling by a metazoan origin recognition complex and its co-loader Cdc6. Authors: Jan Marten Schmidt / Franziska Bleichert / ![]() ![]() Abstract: Eukaryotic DNA replication initiation relies on the origin recognition complex (ORC), a DNA-binding ATPase that loads the Mcm2-7 replicative helicase onto replication origins. Here, we report cryo- ...Eukaryotic DNA replication initiation relies on the origin recognition complex (ORC), a DNA-binding ATPase that loads the Mcm2-7 replicative helicase onto replication origins. Here, we report cryo-electron microscopy (cryo-EM) structures of DNA-bound Drosophila ORC with and without the co-loader Cdc6. These structures reveal that Orc1 and Orc4 constitute the primary DNA binding site in the ORC ring and cooperate with the winged-helix domains to stabilize DNA bending. A loop region near the catalytic Walker B motif of Orc1 directly contacts DNA, allosterically coupling DNA binding to ORC's ATPase site. Correlating structural and biochemical data show that DNA sequence modulates DNA binding and remodeling by ORC, and that DNA bending promotes Mcm2-7 loading in vitro. Together, these findings explain the distinct DNA sequence-dependencies of metazoan and S. cerevisiae initiators in origin recognition and support a model in which DNA geometry and bendability contribute to Mcm2-7 loading site selection in metazoans. | ||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 371.3 KB | Display | ![]() |
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PDB format | ![]() | 283.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.6 MB | Display | ![]() |
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Full document | ![]() | 1.6 MB | Display | |
Data in XML | ![]() | 64.5 KB | Display | |
Data in CIF | ![]() | 97.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22363MC ![]() 7jgrC ![]() 7jgsC ![]() 7jk2C ![]() 7jk3C ![]() 7jk4C ![]() 7jk5C C: citing same article ( M: map data used to model this data |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Origin recognition complex subunit ... , 6 types, 6 molecules DEABCF
#1: Protein | Mass: 52277.109 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: Orc4, Dmel\CG2917, DmORC4, dmOrc4, ORC, ORC4, orc4, rDmORC, CG2917, Dmel_CG2917 Production host: ![]() |
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#2: Protein | Mass: 52175.066 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#3: Protein | Mass: 54485.633 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Protein | Mass: 69086.445 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#5: Protein | Mass: 82364.523 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: Orc3, CG34315-RB, Dmel\CG4088, DmORC3, DmOrc3, l(2)49Fd, l(2)vr6, LAT, Lat, lat, lat-RA, latheo, ORC, ORC3, orc3, vr-6, vr6, CG4088, Dmel_CG4088 Production host: ![]() |
#6: Protein | Mass: 29284.129 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-Non-polymers , 2 types, 6 molecules ![](data/chem/img/ATP.gif)
![](data/chem/img/MG.gif)
![](data/chem/img/MG.gif)
#7: Chemical | #8: Chemical | |
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-Details
Has ligand of interest | N |
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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: Drosophila ORC (active state) / Type: COMPLEX / Entity ID: #1-#6 / Source: RECOMBINANT | ||||||||||||||||||||||||
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Molecular weight | Experimental value: NO | ||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | ||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() | ||||||||||||||||||||||||
Buffer solution | pH: 7.6 | ||||||||||||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES Details: The complex used for grid preparation was reconstituted with DNA. This structure was obtained from a subset of particles not bound to DNA. | ||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil, UltrAuFoil, R1.2/1.3 | ||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / 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: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||
3D reconstruction | Resolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 126560 / Symmetry type: POINT |