5U8T

Structure of Eukaryotic CMG Helicase at a Replication Fork and Implications


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Structure of eukaryotic CMG helicase at a replication fork and implications to replisome architecture and origin initiation.

Georgescu, R.Yuan, Z.Bai, L.de Luna Almeida Santos, R.Sun, J.Zhang, D.Yurieva, O.Li, H.O'Donnell, M.E.

(2017) Proc Natl Acad Sci U S A 114: E697-E706

  • DOI: 10.1073/pnas.1620500114
  • Primary Citation of Related Structures:  
    5U8S, 5U8T

  • PubMed Abstract: 
  • The eukaryotic CMG (Cdc45, Mcm2-7, GINS) helicase consists of the Mcm2-7 hexameric ring along with five accessory factors. The Mcm2-7 heterohexamer, like other hexameric helicases, is shaped like a ring with two tiers, an N-tier ring composed of the N-te ...

    The eukaryotic CMG (Cdc45, Mcm2-7, GINS) helicase consists of the Mcm2-7 hexameric ring along with five accessory factors. The Mcm2-7 heterohexamer, like other hexameric helicases, is shaped like a ring with two tiers, an N-tier ring composed of the N-terminal domains, and a C-tier of C-terminal domains; the C-tier contains the motor. In principle, either tier could translocate ahead of the other during movement on DNA. We have used cryo-EM single-particle 3D reconstruction to solve the structure of CMG in complex with a DNA fork. The duplex stem penetrates into the central channel of the N-tier and the unwound leading single-strand DNA traverses the channel through the N-tier into the C-tier motor, 5'-3' through CMG. Therefore, the N-tier ring is pushed ahead by the C-tier ring during CMG translocation, opposite the currently accepted polarity. The polarity of the N-tier ahead of the C-tier places the leading Pol ε below CMG and Pol α-primase at the top of CMG at the replication fork. Surprisingly, the new N-tier to C-tier polarity of translocation reveals an unforeseen quality-control mechanism at the origin. Thus, upon assembly of head-to-head CMGs that encircle double-stranded DNA at the origin, the two CMGs must pass one another to leave the origin and both must remodel onto opposite strands of single-stranded DNA to do so. We propose that head-to-head motors may generate energy that underlies initial melting at the origin.


    Organizational Affiliation

    Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM2 2868Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM2YBL023CYBL0438
EC: 3.6.4.12
Find proteins for P29469 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM3 3971Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM3YEL032WSYGP-ORF23
EC: 3.6.4.12
Find proteins for P24279 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM4 4933Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM4CDC54HCD21YPR019WYP9531.13
EC: 3.6.4.12
Find proteins for P30665 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein 5 5775Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM5CDC46YLR274WL9328.1
EC: 3.6.4.12
Find proteins for P29496 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6 61017Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM6YGL201C
EC: 3.6.4.12
Find proteins for P53091 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM7 7845Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM7CDC47YBR202WYBR1441
EC: 3.6.4.12
Find proteins for P38132 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF1 A208Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF1YDR013WPZA208YD8119.18
Find proteins for Q12488 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF2 B213Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF2YJL072CHRF213J1086
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF3 C194Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF3YOL146W
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein SLD5 D294Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SLD5YDR489W
Find proteins for Q03406 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45 E650Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CDC45SLD4YLR103CL8004.11
Find proteins for Q08032 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 12
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')F14Saccharomyces cerevisiae
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    ANP
    Query on ANP

    Download Ideal Coordinates CCD File 
    2, 3, 5
    PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
    C10 H17 N6 O12 P3
    PVKSNHVPLWYQGJ-KQYNXXCUSA-N
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: ELECTRON MICROSCOPY
    • Resolution: 4.90 Å
    • Aggregation State: PARTICLE 
    • Reconstruction Method: SINGLE PARTICLE 

    Structure Validation

    View Full Validation Report



    Entry History & Funding Information

    Deposition Data


    Funding OrganizationLocationGrant Number
    National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM111472
    National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM115809

    Revision History 

    • Version 1.0: 2017-02-08
      Type: Initial release
    • Version 1.1: 2017-02-15
      Changes: Other
    • Version 1.2: 2017-09-20
      Changes: Author supporting evidence, Data collection
    • Version 1.3: 2017-11-08
      Changes: Derived calculations
    • Version 1.4: 2018-10-03
      Changes: Data collection, Other, Refinement description
    • Version 1.5: 2019-12-18
      Changes: Author supporting evidence, Other