6SKL

Cryo-EM structure of the CMG Fork Protection Complex at a replication fork - Conformation 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.3 of the entry. See complete history


Literature

Cryo-EM Structure of the Fork Protection Complex Bound to CMG at a Replication Fork.

Baretic, D.Jenkyn-Bedford, M.Aria, V.Cannone, G.Skehel, M.Yeeles, J.T.P.

(2020) Mol Cell 78: 926-940.e13

  • DOI: 10.1016/j.molcel.2020.04.012
  • Primary Citation of Related Structures:  
    6SKL, 6SKO

  • PubMed Abstract: 
  • The eukaryotic replisome, organized around the Cdc45-MCM-GINS (CMG) helicase, orchestrates chromosome replication. Multiple factors associate directly with CMG, including Ctf4 and the heterotrimeric fork protection complex (Csm3/Tof1 and Mrc1), which has ...

    The eukaryotic replisome, organized around the Cdc45-MCM-GINS (CMG) helicase, orchestrates chromosome replication. Multiple factors associate directly with CMG, including Ctf4 and the heterotrimeric fork protection complex (Csm3/Tof1 and Mrc1), which has important roles including aiding normal replication rates and stabilizing stalled forks. How these proteins interface with CMG to execute these functions is poorly understood. Here we present 3 to 3.5 Å resolution electron cryomicroscopy (cryo-EM) structures comprising CMG, Ctf4, and the fork protection complex at a replication fork. The structures provide high-resolution views of CMG-DNA interactions, revealing a mechanism for strand separation, and show Csm3/Tof1 "grip" duplex DNA ahead of CMG via a network of interactions important for efficient replication fork pausing. Although Mrc1 was not resolved in our structures, we determine its topology in the replisome by cross-linking mass spectrometry. Collectively, our work reveals how four highly conserved replisome components collaborate with CMG to facilitate replisome progression and maintain genome stability.


    Organizational Affiliation

    Laboratory of Molecular Biology, Medical Research Council, Cambridge CB2 0QH, UK. Electronic address: jyeeles@mrc-lmb.cam.ac.uk.



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 C217Saccharomyces 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
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45 E650Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CDC45SLD4YLR103CL8004.11
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase alpha-binding protein FGH927Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CTF4CHL15POB1YPR135WP9659.7
Find proteins for Q01454 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
Topoisomerase 1-associated factor 1 X1238Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: TOF1YNL273WN0636
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
Chromosome segregation in meiosis protein 3 Y317Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CSM3YMR048WYM9796.01
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Entity ID: 13
MoleculeChainsLengthOrganismImage
DNA fork, leading-strand templateI85synthetic construct
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Entity ID: 14
MoleculeChainsLengthOrganismImage
DNA fork, lagging-strand templateJ61synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)United KingdomMC_UP_1201/12

Revision History 

  • Version 1.0: 2020-05-06
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Database references
  • Version 1.2: 2020-05-20
    Changes: Structure summary
  • Version 1.3: 2020-06-17
    Changes: Database references