2J9R

Thymidine kinase from B. anthracis in complex with dT.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Studies of Thymidine Kinases from Bacillus Anthracis and Bacillus Cereus Provide Insights Into Quaternary Structure and Conformational Changes Upon Substrate Binding

Kosinska, U.Carnrot, C.Sandrini, M.P.B.Clausen, A.R.Wang, L.Piskur, J.Eriksson, S.Eklund, H.

(2007) FEBS J 274: 727

  • DOI: 10.1111/j.1742-4658.2006.05617.x
  • Primary Citation of Related Structures:  
    2J9R, 2JA1

  • PubMed Abstract: 
  • Thymidine kinase (TK) is the key enzyme in salvaging thymidine to produce thymidine monophosphate. Owing to its ability to phosphorylate nucleoside analogue prodrugs, TK has gained attention as a rate-limiting drug activator. We describe the structures of two bacterial TKs, one from the pathogen Bacillus anthracis in complex with the substrate dT, and the second from the food-poison-associated Bacillus cereus in complex with the feedback inhibitor dTTP ...

    Thymidine kinase (TK) is the key enzyme in salvaging thymidine to produce thymidine monophosphate. Owing to its ability to phosphorylate nucleoside analogue prodrugs, TK has gained attention as a rate-limiting drug activator. We describe the structures of two bacterial TKs, one from the pathogen Bacillus anthracis in complex with the substrate dT, and the second from the food-poison-associated Bacillus cereus in complex with the feedback inhibitor dTTP. Interestingly, in contrast with previous structures of TK in complex with dTTP, in this study dTTP occupies the phosphate donor site and not the phosphate acceptor site. This results in several conformational changes compared with TK structures described previously. One of the differences is the way tetramers are formed. Unlike B. anthracis TK, B. cereus TK shows a loose tetramer. Moreover, the lasso-domain is in open conformation in B. cereus TK without any substrate in the active site, whereas in B. anthracis TK the loop conformation is closed and thymidine occupies the active site. Another conformational difference lies within a region of 20 residues that we refer to as phosphate-binding beta-hairpin. The phosphate-binding beta-hairpin seems to be a flexible region of the enzyme which becomes ordered upon formation of hydrogen bonds to the alpha-phosphate of the phosphate donor, dTTP. In addition to descriptions of the different conformations that TK may adopt during the course of reaction, the oligomeric state of the enzyme is investigated.


    Organizational Affiliation

    Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala Biomedical Centre, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THYMIDINE KINASE A214Bacillus anthracis str. SterneMutation(s): 0 
EC: 2.7.1.21
Find proteins for Q81JX0 (Bacillus anthracis)
Explore Q81JX0 
Go to UniProtKB:  Q81JX0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
THM
Query on THM

Download Ideal Coordinates CCD File 
A
THYMIDINE
C10 H14 N2 O5
IQFYYKKMVGJFEH-XLPZGREQSA-N
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.171α = 90
b = 73.171β = 90
c = 223.734γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-01-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance