7JK6

Structure of Drosophila ORC in the active conformation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Structural mechanism for replication origin binding and remodeling by a metazoan origin recognition complex and its co-loader Cdc6.

Schmidt, J.M.Bleichert, F.

(2020) Nat Commun 11: 4263-4263

  • DOI: https://doi.org/10.1038/s41467-020-18067-7
  • Primary Citation of Related Structures:  
    7JGR, 7JGS, 7JK2, 7JK3, 7JK4, 7JK5, 7JK6

  • PubMed 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-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.


  • Organizational Affiliation

    Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, Basel, 4058, Switzerland.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 4A [auth D]462Drosophila melanogasterMutation(s): 0 
Gene Names: Orc4Dmel\CG2917DmORC4ORCORC4rDmORCCG2917Dmel_CG2917
UniProt
Find proteins for Q9W102 (Drosophila melanogaster)
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UniProt GroupQ9W102
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 5B [auth E]460Drosophila melanogasterMutation(s): 0 
Gene Names: Orc5CG7833
UniProt
Find proteins for Q24169 (Drosophila melanogaster)
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 1C [auth A]488Drosophila melanogasterMutation(s): 0 
Gene Names: Orc1CG10667
UniProt
Find proteins for O16810 (Drosophila melanogaster)
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UniProt GroupO16810
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 2D [auth B]618Drosophila melanogasterMutation(s): 0 
Gene Names: Orc2CG3041
UniProt
Find proteins for Q24168 (Drosophila melanogaster)
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UniProt GroupQ24168
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 3E [auth C]721Drosophila melanogasterMutation(s): 0 
Gene Names: 
UniProt
Find proteins for Q7K2L1 (Drosophila melanogaster)
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Origin recognition complex subunit 6257Drosophila melanogasterMutation(s): 0 
Gene Names: Orc6CG1584
UniProt
Find proteins for Q9Y1B2 (Drosophila melanogaster)
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UniProt GroupQ9Y1B2
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)SwitzerlandERC-STG-757909

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2024-03-06
    Changes: Data collection, Database references