5U8S

Structure of eukaryotic CMG helicase at a replication fork


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.1 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.5 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:  

  • 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 ...

    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

    Department of DNA Replication, The Rockefeller University, New York, NY 10065.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
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: 2
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: 3
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
Entity ID: 4
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: 5
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein 45
E
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 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: 9
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: 10
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: 11
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: 12
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: 13
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: 6
MoleculeChainsLengthOrganism
DNA (26-MER)F26synthetic construct
Entity ID: 7
MoleculeChainsLengthOrganism
DNA (5'-D(P*AP*TP*CP*GP*AP*TP*CP*GP*AP*TP*CP*GP*AP*T)-3')G14synthetic construct
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download SDF File 
Download CCD File 
2, 3, 5
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.1 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM111472
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM115809

Revision History 

  • Version 1.0: 2017-01-25
    Type: Initial release
  • Version 1.1: 2017-02-01
    Type: Database references
  • Version 1.2: 2017-02-08
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Data collection
  • Version 1.4: 2017-11-08
    Type: Derived calculations
  • Version 1.5: 2018-10-03
    Type: Data collection, Refinement description