3JC5

Structure of the eukaryotic replicative CMG helicase and pumpjack motion


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.7 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:  

  • 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 helicas ...

    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

    Department of Biochemistry &Cell Biology, Stony Brook University, Stony Brook, New York, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA replication licensing factor MCM2
2
868Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM2
EC: 3.6.4.12
Find proteins for P29469 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM2
Go to UniProtKB:  P29469
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA replication licensing factor MCM3
3
971Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM3
EC: 3.6.4.12
Find proteins for P24279 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM3
Go to UniProtKB:  P24279
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
DNA replication licensing factor MCM4
4
933Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM4 (CDC54, HCD21)
EC: 3.6.4.12
Find proteins for P30665 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM4
Go to UniProtKB:  P30665
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Minichromosome maintenance protein 5
5
775Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM5 (CDC46)
EC: 3.6.4.12
Find proteins for P29496 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM5
Go to UniProtKB:  P29496
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
DNA replication licensing factor MCM6
6
1017Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM6
EC: 3.6.4.12
Find proteins for P53091 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM6
Go to UniProtKB:  P53091
Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
DNA replication licensing factor MCM7
7
845Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: MCM7 (CDC47)
EC: 3.6.4.12
Find proteins for P38132 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MCM7
Go to UniProtKB:  P38132
Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein 45
c
650Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: CDC45 (SLD4)
Find proteins for Q08032 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: CDC45
Go to UniProtKB:  Q08032
Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
DNA replication complex GINS protein SLD5
D
294Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SLD5
Find proteins for Q03406 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q03406
Entity ID: 9
MoleculeChainsSequence LengthOrganismDetails
DNA replication complex GINS protein PSF2
B
213Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: PSF2
Find proteins for P40359 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P40359
Entity ID: 10
MoleculeChainsSequence LengthOrganismDetails
DNA replication complex GINS protein PSF1
A
208Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: PSF1
Find proteins for Q12488 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q12488
Entity ID: 11
MoleculeChainsSequence LengthOrganismDetails
DNA replication complex GINS protein PSF3
C
194Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: PSF3
Find proteins for Q12146 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q12146
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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