7JGR

Structure of Drosophila ORC bound to DNA (84 bp) and Cdc6


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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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: 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 ...

    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

    Department of Molecular Biophysics and Biochemistry, Yale University, 260 Whitney Avenue, New Haven, CT, 06520, USA. franziska.bleichert@yale.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 2A [auth B]618Drosophila melanogasterMutation(s): 0 
Gene Names: Orc2CG3041
UniProt
Find proteins for Q24168 (Drosophila melanogaster)
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Go to UniProtKB:  Q24168
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UniProt GroupQ24168
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AT22044p1B [auth C]721Drosophila melanogasterMutation(s): 0 
Gene Names: 
UniProt
Find proteins for Q7K2L1 (Drosophila melanogaster)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 4C [auth D]462Drosophila melanogasterMutation(s): 0 
Gene Names: orc4Dmel\CG2917dmOrc4ORCrDmORCCG2917Dmel_CG2917Orc4DmORC4ORC4
UniProt
Find proteins for Q9W102 (Drosophila melanogaster)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 5D [auth E]460Drosophila melanogasterMutation(s): 0 
Gene Names: Orc5CG7833
UniProt
Find proteins for Q24169 (Drosophila melanogaster)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 6E [auth F]257Drosophila melanogasterMutation(s): 0 
Gene Names: Orc6CG1584
UniProt
Find proteins for Q9Y1B2 (Drosophila melanogaster)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 1F [auth A]488Drosophila melanogasterMutation(s): 0 
Gene Names: Orc1CG10667
UniProt
Find proteins for O16810 (Drosophila melanogaster)
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control proteinG424Drosophila melanogasterMutation(s): 0 
Gene Names: cdc6DmCdc6Dmel\CG5971CG5971Dmel_CG5971Cdc6CDC6
UniProt
Find proteins for Q9VSM9 (Drosophila melanogaster)
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Entity ID: 8
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DNA (34-MER)H84synthetic construct
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Entity ID: 9
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DNA (34-MER)I84synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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