Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 155.71 kDa 
• Atom Count: 10082 
• Modelled Residue Count: 1152 
• Deposited Residue Count: 1204 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

2V6E

protelomerase TelK complexed with substrate DNA

• PDB DOI: 10.2210/pdb2V6E/pdb
• NDB: NA0310

• Classification: HYDROLASE
• Organism(s): Klebsiella phage phiKO2, Escherichia virus N15
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2007-07-17 Released: 2007-10-02 
• Deposition Author(s): Aihara, H., Huang, W.M., Ellenberger, T.

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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 

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

• PubMed: 17889664 
• 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. 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTELEMORASE	A, B	558	Klebsiella phage phiKO2	Mutation(s): 0  Gene Names: 26
UniProt
Find proteins for Q6UAV6 (Klebsiella phage phiKO2) Explore Q6UAV6  Go to UniProtKB:  Q6UAV6

Entity ID: 2
Molecule	Chains	Length	Organism	Image
TELRL	C, E	25	Escherichia virus N15

Entity ID: 3
Molecule	Chains	Length	Organism	Image
TELRL	D, F	19	Escherichia virus N15

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
VO4	G [auth A], H [auth B]	VANADATE ION O4 V LSGOVYNHVSXFFJ-UHFFFAOYSA-N

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 = 157.973	α = 90
b = 157.973	β = 90
c = 90.842	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-07-17 
• Released Date: 2007-10-02 
Deposition Author(s): Aihara, H., Huang, W.M., Ellenberger, T.

Revision History  

• 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