5U8T

Structure of Eukaryotic CMG Helicase at a Replication Fork and Implications


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 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 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.,Cryo-EM Structural Biology Laboratory, Van Andel Research Institute, Grand Rapids, MI 49503; Huilin.Li@VAI.org odonnel@rockefeller.edu.,Cryo-EM Structural Biology Laboratory, Van Andel Research Institute, Grand Rapids, MI 49503.,Biochemistry and Structural Biology Graduate Program, Stony Brook University, Stony Brook, NY 11794.,Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065.,Department of DNA Replication, The Rockefeller University, New York, NY 10065; Huilin.Li@VAI.org odonnel@rockefeller.edu.




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
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: 8
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: 9
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: 10
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: 11
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: 12
MoleculeChainsLengthOrganism
DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')F14Saccharomyces cerevisiae
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download SDF File 
Download CCD File 
2, 3, 5
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 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: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-15
    Type: Other
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence, Data collection
  • Version 1.3: 2017-11-08
    Type: Derived calculations
  • Version 1.4: 2018-10-03
    Type: Data collection, Other, Refinement description