Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 12-mer - A2B2C2D2E2F2 Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Hetero 12-mer -A8B4 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: microscopy

Macromolecule Content

• Total Structure Weight: 1252666.75 
• Atom Count: 61818 
• Residue Count: 10942 
• Unique protein chains: 6
• Unique nucleic acid chains: 2

6F0L

S. cerevisiae MCM double hexamer bound to duplex DNA

• DOI: 10.2210/pdb6F0L/pdb
• EMDataResource: EMD-3834

• Classification: HYDROLASE
• Organism(s): Saccharomyces cerevisiae (strain ATCC 204508 / S288c), synthetic construct
• Expression System: Saccharomyces cerevisiae


• Deposited: 2017-11-20 Released: 2017-12-06 
• Deposition Author(s): Abid Ali, F., Pye, V.E., Douglas, M.E., Locke, J., Nans, A., Diffley, J.F.X., Costa, A.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.77 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of a licensed DNA replication origin.

Abid Ali, F., Douglas, M.E., Locke, J., Pye, V.E., Nans, A., Diffley, J.F.X., Costa, A.

(2017) Nat Commun 8: 2241-2241

• PubMed: 29269875 
• DOI: 10.1038/s41467-017-02389-0


• PubMed Abstract: 
  

Eukaryotic origins of replication are licensed upon loading of the MCM helicase motor onto DNA. ATP hydrolysis by MCM is required for loading and the post-catalytic MCM is an inactive double hexamer that encircles duplex DNA. Origin firing depends on MCM engagement of Cdc45 and GINS to form the CMG holo-helicase. CMG assembly requires several steps including MCM phosphorylation by DDK. To understand origin activation, here we have determined the cryo-EM structures of DNA-bound MCM, either unmodified or phosphorylated, and visualize a phospho-dependent MCM element likely important for Cdc45 recruitment. MCM pore loops touch both the Watson and Crick strands, constraining duplex DNA in a bent configuration. By comparing our new MCM-DNA structure with the structure of CMG-DNA, we suggest how the conformational transition from the loaded, post-catalytic MCM to CMG might promote DNA untwisting and melting at the onset of replication.

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Organizational Affiliation: 

Macromolecular Machines Laboratory, The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
DNA replication licensing factor MCM2	2, A	868	Saccharomyces 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
Molecule	Chains	Sequence Length	Organism	Details
DNA replication licensing factor MCM3	3, B	971	Saccharomyces 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
Molecule	Chains	Sequence Length	Organism	Details
DNA replication licensing factor MCM4	4, C	933	Saccharomyces 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
Molecule	Chains	Sequence Length	Organism	Details
Minichromosome maintenance protein 5	5, D	775	Saccharomyces 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
Molecule	Chains	Sequence Length	Organism	Details
DNA replication licensing factor MCM6	6, E	1017	Saccharomyces 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
Molecule	Chains	Sequence Length	Organism	Details
DNA replication licensing factor MCM7	7, F	845	Saccharomyces 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
Molecule	Chains	Length	Organism
DNA (62-MER)	X	62	synthetic construct

Entity ID: 8
Molecule	Chains	Length	Organism
DNA (62-MER)	Y	62	synthetic construct

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ADP	3, 5, B, D	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.77 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2017-11-20 
• Released Date: 2017-12-06 
• Deposition Author(s): Abid Ali, F., Pye, V.E., Douglas, M.E., Locke, J., Nans, A., Diffley, J.F.X., Costa, A.

Revision History 

• Version 1.0: 2017-12-06
  Type: Initial release
• Version 1.1: 2018-01-03
  Type: Database references
• Version 1.2: 2018-11-21
  Type: Advisory, Data collection, Derived calculations