5U8S

Structure of eukaryotic CMG helicase at a replication fork


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.6 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-terminal domains, and a C-tier of C-terminal domains; the C-tier contains the motor ...

    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 complex GINS protein PSF1A208Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF1YDR013WPZA208YD8119.18
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF2B213Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF2YJL072CHRF213J1086
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF3C194Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF3YOL146W
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein SLD5D294Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SLD5YDR489W
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45E650Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CDC45SLD4YLR103CL8004.11
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM2H [auth 2]868Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM2YBL023CYBL0438
EC: 3.6.4.12
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM3I [auth 3]971Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM3YEL032WSYGP-ORF23
EC: 3.6.4.12
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM4J [auth 4]933Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM4CDC54HCD21YPR019WYP9531.13
EC: 3.6.4.12
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein 5K [auth 5]775Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM5CDC46YLR274WL9328.1
EC: 3.6.4.12
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6L [auth 6]1017Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM6YGL201C
EC: 3.6.4.12
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM7M [auth 7]845Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM7CDC47YBR202WYBR1441
EC: 3.6.4.12
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (26-MER)F 26synthetic construct
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Entity ID: 7
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*AP*TP*CP*GP*AP*TP*CP*GP*AP*TP*CP*GP*AP*T)-3')G 14synthetic construct
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Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
N [auth 2],
O [auth 3],
P [auth 5]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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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  (Full details and data files)

  • Version 1.0: 2017-01-25
    Type: Initial release
  • Version 1.1: 2017-02-01
    Changes: Database references
  • Version 1.2: 2017-02-08
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2017-11-08
    Changes: Derived calculations
  • Version 1.5: 2018-10-03
    Changes: Data collection, Refinement description
  • Version 1.6: 2020-01-01
    Changes: Author supporting evidence