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: https://doi.org/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 important roles including aiding normal replication rates and stabilizing stalled forks ...

    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 MCM2A [auth 2]868Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM2, YBL023C, YBL0438
EC: 3.6.4.12
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM3B [auth 3]971Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM3, YEL032W, SYGP-ORF23
EC: 3.6.4.12
UniProt
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM4C [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: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein 5D [auth 5]775Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM5, CDC46, YLR274W, L9328.1
EC: 3.6.4.12
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6E [auth 6]1,017Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM6, YGL201C
EC: 3.6.4.12
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM7F [auth 7]845Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM7, CDC47, YBR202W, YBR1441
EC: 3.6.4.12
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF1G [auth A]208Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF1, YDR013W, PZA208, YD8119.18
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF2H [auth B]213Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF2, YJL072C, HRF213, J1086
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF3I [auth C]217Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSF3, YOL146W
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein SLD5J [auth D]294Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SLD5, YDR489W
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45K [auth E]650Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CDC45, SLD4, YLR103C, L8004.11
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase alpha-binding proteinL [auth F],
M [auth G],
N [auth H]		927Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CTF4, CHL15, POB1, YPR135W, P9659.7
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
Topoisomerase 1-associated factor 1Q [auth X]1,238Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: TOF1, YNL273W, N0636
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
Chromosome segregation in meiosis protein 3R [auth Y]317Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CSM3, YMR048W, YM9796.01
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Entity ID: 13
MoleculeChainsLengthOrganismImage
DNA fork, leading-strand templateO [auth I]85synthetic construct
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Entity ID: 14
MoleculeChainsLengthOrganismImage
DNA fork, lagging-strand templateP [auth J]61synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.16-3549
MODEL REFINEMENTREFMAC5.8.0238
RECONSTRUCTIONRELION3.0.6

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  (Full details and data files)

  • 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