2IX2

Crystal structure of the heterotrimeric PCNA from Sulfolobus solfataricus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structure of the Heterotrimeric PCNA from Sulfolobus Solfataricus.

Williams, G.J.Johnson, K.Rudolf, J.Mcmahon, S.A.Carter, L.Oke, M.Liu, H.Taylor, G.L.White, M.F.Naismith, J.H.

(2006) Acta Crystallogr Sect F Struct Biol Cryst Commun 62: 944

  • DOI: https://doi.org/10.1107/S1744309106034075
  • Primary Citation of Related Structures:  
    2IX2

  • PubMed Abstract: 

    PCNA is a ring-shaped protein that encircles DNA, providing a platform for the association of a wide variety of DNA-processing enzymes that utilize the PCNA sliding clamp to maintain proximity to their DNA substrates. PCNA is a homotrimer in eukaryotes, but a heterotrimer in crenarchaea such as Sulfolobus solfataricus. The three proteins are SsoPCNA1 (249 residues), SsoPCNA2 (245 residues) and SsoPCNA3 (259 residues). The heterotrimeric protein crystallizes in space group P2(1), with unit-cell parameters a = 44.8, b = 78.8, c = 125.6 A, beta = 100.5 degrees. The crystal structure of this heterotrimeric PCNA molecule has been solved using molecular replacement. The resulting structure to 2.3 A sheds light on the differential stabilities of the interactions observed between the three subunits and the specificity of individual subunits for partner proteins.


  • Organizational Affiliation

    Centre for Biomolecular Science and The Scottish Structural Proteomics Facility, The University of St Andrews, Fife KY16 9RH, Scotland.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA POLYMERASE SLIDING CLAMP B249Saccharolobus solfataricusMutation(s): 0 
UniProt
Find proteins for P57766 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore P57766 
Go to UniProtKB:  P57766
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP57766
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA POLYMERASE SLIDING CLAMP C245Saccharolobus solfataricusMutation(s): 0 
UniProt
Find proteins for Q97Z84 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97Z84 
Go to UniProtKB:  Q97Z84
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97Z84
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA POLYMERASE SLIDING CLAMP A259Saccharolobus solfataricusMutation(s): 0 
UniProt
Find proteins for P57765 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore P57765 
Go to UniProtKB:  P57765
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP57765
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.808α = 90
b = 78.798β = 100.51
c = 125.611γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description