1HH1

THE STRUCTURE OF HJC, A HOLLIDAY JUNCTION RESOLVING ENZYME FROM SULFOLOBUS SOLFATARICUS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.220 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure of Hjc, a Holliday Junction Resolvase, from Sulfolobus Solfataricus

Bond, C.S., Kvaratskhelia, M., Richard, D., White, M.F., Hunter, W.N.

(2001) Proc Natl Acad Sci U S A 98: 5509

  • DOI: 10.1073/pnas.091613398
  • Primary Citation of Related Structures:  
    1HH1

  • PubMed Abstract: 

    • The 2.15-A structure of Hjc, a Holliday junction-resolving enzyme from the archaeon Sulfolobus solfataricus, reveals extensive structural homology with a superfamily of nucleases that includes type II restriction enzymes. Hjc is a dimer with a large DNA-binding surface consisting of numerous basic residues surrounding the metal-binding residues of the active sites ...

    The 2.15-A structure of Hjc, a Holliday junction-resolving enzyme from the archaeon Sulfolobus solfataricus, reveals extensive structural homology with a superfamily of nucleases that includes type II restriction enzymes. Hjc is a dimer with a large DNA-binding surface consisting of numerous basic residues surrounding the metal-binding residues of the active sites. Residues critical for catalysis, identified on the basis of sequence comparisons and site-directed mutagenesis studies, are clustered to produce two active sites in the dimer, about 29 A apart, consistent with the requirement for the introduction of paired nicks in opposing strands of the four-way DNA junction substrate. Hjc displays similarity to the restriction endonucleases in the way its specific DNA-cutting pattern is determined but uses a different arrangement of nuclease subunits. Further structural similarity to a broad group of metal/phosphate-binding proteins, including conservation of active-site location, is observed. A high degree of conservation of surface electrostatic character is observed between Hjc and T4-phage endonuclease VII despite a complete lack of structural homology. A model of the Hjc-Holliday junction complex is proposed, based on the available functional and structural data.

    Organizational Affiliation: 

    Wellcome Trust Biocentre, University of Dundee, Dundee, Tayside DD1 5EH, United Kingdom. C.S.Bond@dundee.ac.uk



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HOLLIDAY JUNCTION RESOLVING ENZYME HJCA143Saccharolobus solfataricusMutation(s): 0 
EC: 3.1.22.4
UniProt
Find proteins for Q7LXU0 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q7LXU0 
Go to UniProtKB:  Q7LXU0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7LXU0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.220 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.699α = 90
b = 52.699β = 90
c = 207.607γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALAdata scaling
SOLVE/RESOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-04-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance