2V6E

protelomerase TelK complexed with substrate DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


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

  • 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 chr ...

    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 LengthOrganismDetails
PROTELEMORASE
A, B
558Klebsiella phage phiKO2Mutation(s): 0 
Find proteins for Q6UAV6 (Klebsiella phage phiKO2)
Go to UniProtKB:  Q6UAV6
Entity ID: 2
MoleculeChainsLengthOrganism
TELRLC,E25Escherichia virus N15
Entity ID: 3
MoleculeChainsLengthOrganism
TELRLD,F19Escherichia virus N15
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
VO4
Query on VO4

Download SDF File 
Download CCD File 
A, B
VANADATE ION
O4 V
LSGOVYNHVSXFFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.255 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 157.973α = 90.00
b = 157.973β = 90.00
c = 90.842γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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