Pyrococcus furiosus MCM N-terminal domain beta-turn triple mutant pentameric ring

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


MCM ring hexamerization is a prerequisite for DNA-binding.

Froelich, C.A.Nourse, A.Enemark, E.J.

(2015) Nucleic Acids Res 43: 9553-9563

  • DOI: https://doi.org/10.1093/nar/gkv914
  • Primary Citation of Related Structures:  
    4YWK, 4YWL, 4YWM

  • PubMed Abstract: 

    The hexameric Minichromosome Maintenance (MCM) protein complex forms a ring that unwinds DNA at the replication fork in eukaryotes and archaea. Our recent crystal structure of an archaeal MCM N-terminal domain bound to single-stranded DNA (ssDNA) revealed ssDNA associating across tight subunit interfaces but not at the loose interfaces, indicating that DNA-binding is governed not only by the DNA-binding residues of the subunits (MCM ssDNA-binding motif, MSSB) but also by the relative orientation of the subunits. We now extend these findings by showing that DNA-binding by the MCM N-terminal domain of the archaeal organism Pyrococcus furiosus occurs specifically in the hexameric oligomeric form. We show that mutants defective for hexamerization are defective in binding ssDNA despite retaining all the residues observed to interact with ssDNA in the crystal structure. One mutation that exhibits severely defective hexamerization and ssDNA-binding is at a conserved phenylalanine that aligns with the mouse Mcm4(Chaos3) mutation associated with chromosomal instability, cancer, and decreased intersubunit association.

  • Organizational Affiliation

    Department of Structural Biology, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 311, Memphis, TN 38105, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cell division control protein 21
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
257Pyrococcus furiosus DSM 3638Mutation(s): 3 
Gene Names: PF0482
Find proteins for Q8U3I4 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Explore Q8U3I4 
Go to UniProtKB:  Q8U3I4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8U3I4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
BA [auth J]
M [auth B]
P [auth D]
R [auth E]
T [auth F]
BA [auth J],
M [auth B],
P [auth D],
R [auth E],
T [auth F],
V [auth G],
X [auth H],
Z [auth I]
O4 S
Query on ZN

Download Ideal Coordinates CCD File 
AA [auth J]
K [auth A]
L [auth B]
N [auth C]
O [auth D]
AA [auth J],
K [auth A],
L [auth B],
N [auth C],
O [auth D],
Q [auth E],
S [auth F],
U [auth G],
W [auth H],
Y [auth I]
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 210.709α = 90
b = 210.709β = 90
c = 209.638γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM098771
St. Jude Children's Research Hospital (ALSAC)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-23
    Type: Initial release
  • Version 1.1: 2015-10-07
    Changes: Database references
  • Version 1.2: 2015-11-11
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description