4R7Y

Crystal structure of an active MCM hexamer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.263 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Analysis of the crystal structure of an active MCM hexamer.

Miller, J.M.Arachea, B.T.Epling, L.B.Enemark, E.J.

(2014) Elife 3: e03433-e03433

  • DOI: 10.7554/eLife.03433
  • Primary Citation of Related Structures:  
    4R7Y, 4R7Z

  • PubMed Abstract: 
  • In a previous Research article (Froelich et al., 2014), we suggested an MCM helicase activation mechanism, but were limited in discussing the ATPase domain because it was absent from the crystal structure. Here we present the crystal structure of a nearly full-length MCM hexamer that is helicase-active and thus has all features essential for unwinding DNA ...

    In a previous Research article (Froelich et al., 2014), we suggested an MCM helicase activation mechanism, but were limited in discussing the ATPase domain because it was absent from the crystal structure. Here we present the crystal structure of a nearly full-length MCM hexamer that is helicase-active and thus has all features essential for unwinding DNA. The structure is a chimera of Sulfolobus solfataricus N-terminal domain and Pyrococcus furiosus ATPase domain. We discuss three major findings: 1) a novel conformation for the A-subdomain that could play a role in MCM regulation; 2) interaction of a universally conserved glutamine in the N-terminal Allosteric Communication Loop with the AAA+ domain helix-2-insert (h2i); and 3) a recessed binding pocket for the MCM ssDNA-binding motif influenced by the h2i. We suggest that during helicase activation, the h2i clamps down on the leading strand to facilitate strand retention and regulate ATP hydrolysis.


    Organizational Affiliation

    Department of Structural Biology, St Jude Children's Research Hospital, Memphis, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Minichromosome maintenance protein MCM, Cell division control protein 21A, B613Saccharolobus solfataricus P2Pyrococcus furiosus DSM 3638Mutation(s): 0 
Gene Names: MCMSSO0774PF0482
EC: 3.6.4.12
Find proteins for Q8U3I4 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Explore Q8U3I4 
Go to UniProtKB:  Q8U3I4
Find proteins for Q9UXG1 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q9UXG1 
Go to UniProtKB:  Q9UXG1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.263 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.902α = 90
b = 118.902β = 90
c = 199.317γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-08
    Type: Initial release
  • Version 1.1: 2014-10-15
    Changes: Database references
  • Version 1.2: 2014-11-12
    Changes: Database references
  • Version 1.3: 2014-11-19
    Changes: Database references
  • Version 1.4: 2017-08-02
    Changes: Refinement description, Source and taxonomy