2V6E

protelomerase TelK complexed with substrate DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.255 

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


Literature

An Interlocked Dimer of the Protelomerase Telk Distorts DNA Structure for the Formation of Hairpin Telomeres

Aihara, H., Huang, W.M., Ellenberger, T.

(2007) Mol Cell 27: 901

  • DOI: 10.1016/j.molcel.2007.07.026
  • Primary Citation of Related Structures:  
    2V6E

  • PubMed Abstract: 

    • The termini of linear chromosomes are protected by specialized DNA structures known as telomeres that also facilitate the complete replication of DNA ends. The simplest type of telomere is a covalently closed DNA hairpin structure found in linear chromosomes of prokaryotes and viruses ...

    The termini of linear chromosomes are protected by specialized DNA structures known as telomeres that also facilitate the complete replication of DNA ends. The simplest type of telomere is a covalently closed DNA hairpin structure found in linear chromosomes of prokaryotes and viruses. Bidirectional replication of a chromosome with hairpin telomeres produces a catenated circular dimer that is subsequently resolved into unit-length chromosomes by a dedicated DNA cleavage-rejoining enzyme known as a hairpin telomere resolvase (protelomerase). Here we report a crystal structure of the protelomerase TelK from Klebsiella oxytoca phage varphiKO2, in complex with the palindromic target DNA. The structure shows the TelK dimer destabilizes base pairing interactions to promote the refolding of cleaved DNA ends into two hairpin ends. We propose that the hairpinning reaction is made effectively irreversible by a unique protein-induced distortion of the DNA substrate that prevents religation of the cleaved DNA substrate.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTELEMORASEA, B558Klebsiella phage phiKO2Mutation(s): 0 
Gene Names: 26
UniProt
Find proteins for Q6UAV6 (Klebsiella phage phiKO2)
Explore Q6UAV6 
Go to UniProtKB:  Q6UAV6
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
TELRLC, E25Escherichia virus N15
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
    MoleculeChainsLengthOrganismImage
    TELRLD, F19Escherichia virus N15
    Protein Feature View
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    • Reference Sequence
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    VO4
    Query on VO4
    Download Ideal Coordinates CCD File 
    		 G [auth A], H [auth B]VANADATE ION
    O4 V
    LSGOVYNHVSXFFJ-UHFFFAOYSA-N    		 Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.20 Å
    • R-Value Free: 0.286 
    • R-Value Work: 0.255 
    • R-Value Observed: 0.255 
    • Space Group: P 41
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 157.973α = 90
    b = 157.973β = 90
    c = 90.842γ = 90
    Software Package:
    Software NamePurpose
    CNSrefinement
    HKL-2000data reduction
    HKL-2000data scaling
    SOLVEphasing

    Structure Validation

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    View more in-depth experimental data

    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2007-10-02
      Type: Initial release
    • Version 1.1: 2011-05-08
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance