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: PSF1, YDR013W, PZA208, YD8119.18
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF2B213Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF2, YJL072C, HRF213, J1086
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF3C194Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF3, YOL146W
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein SLD5D294Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SLD5, YDR489W
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45E650Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CDC45, SLD4, YLR103C, L8004.11
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM2H [auth 2]868Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM2, YBL023C, YBL0438
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: MCM3, YEL032W, SYGP-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: MCM4, CDC54, HCD21, YPR019W, YP9531.13
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: MCM5, CDC46, YLR274W, L9328.1
EC: 3.6.4.12
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Find proteins for P29496 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6L [auth 6]1017Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM6, YGL201C
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: MCM7, CDC47, YBR202W, YBR1441
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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View more in-depth experimental data

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