3JC7

Structure of the eukaryotic replicative CMG helicase and pumpjack motion


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structure of the eukaryotic replicative CMG helicase suggests a pumpjack motion for translocation.

Yuan, Z.Bai, L.Sun, J.Georgescu, R.Liu, J.O'Donnell, M.E.Li, H.

(2016) Nat Struct Mol Biol 23: 217-224

  • DOI: 10.1038/nsmb.3170
  • Primary Citation of Related Structures:  
    3JC5, 3JC6, 3JC7

  • PubMed Abstract: 
  • The CMG helicase is composed of Cdc45, Mcm2-7 and GINS. Here we report the structure of the Saccharomyces cerevisiae CMG, determined by cryo-EM at a resolution of 3.7-4.8 Å. The structure reveals that GINS and Cdc45 scaffold the N tier of the helicase while enabling motion of the AAA+ C tier ...

    The CMG helicase is composed of Cdc45, Mcm2-7 and GINS. Here we report the structure of the Saccharomyces cerevisiae CMG, determined by cryo-EM at a resolution of 3.7-4.8 Å. The structure reveals that GINS and Cdc45 scaffold the N tier of the helicase while enabling motion of the AAA+ C tier. CMG exists in two alternating conformations, compact and extended, thus suggesting that the helicase moves like an inchworm. The N-terminal regions of Mcm2-7, braced by Cdc45-GINS, form a rigid platform upon which the AAA+ C domains make longitudinal motions, nodding up and down like an oil-rig pumpjack attached to a stable platform. The Mcm ring is remodeled in CMG relative to the inactive Mcm2-7 double hexamer. The Mcm5 winged-helix domain is inserted into the central channel, thus blocking entry of double-stranded DNA and supporting a steric-exclusion DNA-unwinding model.


    Organizational Affiliation

    Biology Department, Brookhaven National Laboratory, Upton, New York, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM2A [auth 2]868Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM2YBL023CYBL0438
EC: 3.6.4.12
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM3B [auth 3]971Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM3YEL032WSYGP-ORF23
EC: 3.6.4.12
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM4C [auth 4]933Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM4CDC54HCD21YPR019WYP9531.13
EC: 3.6.4.12
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein 5D [auth 5]775Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM5CDC46YLR274WL9328.1
EC: 3.6.4.12
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6E [auth 6]1017Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM6YGL201C
EC: 3.6.4.12
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM7F [auth 7]845Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MCM7CDC47YBR202WYBR1441
EC: 3.6.4.12
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division control protein 45G [auth c]650Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: CDC45SLD4YLR103CL8004.11
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein SLD5H [auth D]294Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: PSF3YOL146W
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF2I [auth B]213Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: PSF2YJL072CHRF213J1086
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF1J [auth A]208Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SLD5YDR489W
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication complex GINS protein PSF3K [auth C]194Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: PSF1YDR013WPZA208YD8119.18
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Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
L [auth 7]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-10
    Type: Initial release
  • Version 1.1: 2016-02-24
    Changes: Database references
  • Version 1.2: 2016-03-16
    Changes: Database references
  • Version 1.3: 2018-01-24
    Changes: Data processing, Structure summary
  • Version 1.4: 2018-07-18
    Changes: Data collection