6EYC

Re-refinement of the MCM2-7 double hexamer using ISOLDE


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in:3ja8


Literature

ISOLDE: a physically realistic environment for model building into low-resolution electron-density maps.

Croll, T.I.

(2018) Acta Crystallogr D Struct Biol 74: 519-530

  • DOI: 10.1107/S2059798318002425
  • Primary Citation of Related Structures:  
    6EYC

  • PubMed Abstract: 
  • This paper introduces ISOLDE, a new software package designed to provide an intuitive environment for high-fidelity interactive remodelling/refinement of macromolecular models into electron-density maps. ISOLDE combines interactive molecular-dynamics fle ...

    This paper introduces ISOLDE, a new software package designed to provide an intuitive environment for high-fidelity interactive remodelling/refinement of macromolecular models into electron-density maps. ISOLDE combines interactive molecular-dynamics flexible fitting with modern molecular-graphics visualization and established structural biology libraries to provide an immersive interface wherein the model constantly acts to maintain physically realistic conformations as the user interacts with it by directly tugging atoms with a mouse or haptic interface or applying/removing restraints. In addition, common validation tasks are accelerated and visualized in real time. Using the recently described 3.8 Å resolution cryo-EM structure of the eukaryotic minichromosome maintenance (MCM) helicase complex as a case study, it is demonstrated how ISOLDE can be used alongside other modern refinement tools to avoid common pitfalls of low-resolution modelling and improve the quality of the final model. A detailed analysis of changes between the initial and final model provides a somewhat sobering insight into the dangers of relying on a small number of validation metrics to judge the quality of a low-resolution model.


    Related Citations: 
    • New tool: phenix.real_space_refine
      Afonine, P.V., Headd, J.J., Terwilliger, T.T., Adams, P.D.
      (2013) Comput Cryst Newsl 4: 43
    • PHENIX: a comprehensive Python-based system for macromolecular structure solution.
      Adams, P.D., Afonine, P.V., Bunkoczi, G., Chen, V.B., Davis, I.W., Echols, N., Headd, J.J., Hung, L.W., Kapral, G.J., Grosse-Kunstleve, R.W., McCoy, A.J., Moriarty, N.W., Oeffner, R., Read, R.J., Richardson, D.C., Richardson, J.S., Terwilliger, T.C., Zwart, P.H.
      (2010) Acta Crystallogr D Biol Crystallogr 66: 213

    Organizational Affiliation

    Cambridge Institute for Medical Research, University of Cambridge, Wellcome Trust/MRC Building, Cambridge CB2 0XY, England.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM2 2868Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM2YBL023CYBL0438
EC: 3.6.4.12
Find proteins for P29469 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM3 3971Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM3YEL032WSYGP-ORF23
EC: 3.6.4.12
Find proteins for P24279 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM4 4933Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM4CDC54HCD21YPR019WYP9531.13
EC: 3.6.4.12
Find proteins for P30665 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein 5 5775Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM5CDC46YLR274WL9328.1
EC: 3.6.4.12
Find proteins for P29496 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM6 61017Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM6YGL201C
EC: 3.6.4.12
Find proteins for P53091 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA replication licensing factor MCM7 7845Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCM7CDC47YBR202WYBR1441
EC: 3.6.4.12
Find proteins for P38132 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-11-11 
  • Released Date: 2018-06-20 
  • Deposition Author(s): Croll, T.I.

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom082961/Z/07/Z

Revision History 

  • Version 1.0: 2018-06-20
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Refinement description
  • Version 1.2: 2019-12-11
    Changes: Other